NC0021717_Draft Permit_20240306

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Mr. Ken Noland, Town Manager
Town of Wilkesboro
P.O. Box 1056
Wilkesboro, North Carolina 28697
Dear Mr. Noland:
NORTH CAROLINA
Environmental Quality
March 5, 2024
Subject: Draft NPDES Permit Renewal
Permit NCO021717
Cub Creek WWTP
Wilkes County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• As expansion of the Cub Creek WWTP has been approved by the Division, an expansion
page has been added to the permit for 8.0 MGD flow tier [See A.(3.)].
As review of compliance history and submitted data demonstrated no cause for continued
concern, the oil and grease limits and monitoring requirements have been removed from the
permit [See A.(1.) and A.(2.)].
• Based on the reasonable potential analysis (RPA) showing reasonable potential to violate
state water quality standards, total selenium limits and monthly monitoring have been added
to the permit at all flow tiers [See A.(1.), A.(2.) and A.(3.)].
Total Residual Chlorine (TRC) limits and monitoring requirement have not been in the
permit, as the facility uses UV for disinfection. However, in the event of an emergency where
chlorination is required as a backup or temporary means of disinfection at the facility, a TRC
limit and monitoring requirement have been added to the permit [See A.(1.), A.(2.) and A.(3.)].
Please note that TRC monitoring is only required when chlorine is used at the plant, and as
part of the regular Effluent Pollutant Scans.
Based on review of instream monitoring requirements and due to the need for instream
data to understand the impact of the facility expansion on the receiving waterbody, instream
monitoring is only for turbidity, pH, ammonia, TKN, NO2+NO3, TP and fecal coliform has
been added to the permit. To improve clarity on instream monitoring requirements, Special
Condition A.(4.) has been added to the permit.
• Based on discussion with the Basin Planning Branch and due to the need for instream
data to understand the impact of the facility expansion on the receiving waterbody, instream
monitoring is only provisionally waived due to membership in the Yadkin -Pee Dee River
Basin Association (YPDRBA) if YPDRBA conducts representative instream sampling
upstream of the facility's discharge. Should YPDRBA not activate a representative upstream
monitoring station, the instream monitoring requirements shall immediately be reinstated.
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.707.9000
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• The Division is implementing dissolved metals standards in all permits, per the 2016
revisions to State water quality standards. As such, the NPDES Permitting Unit will need
site -specific effluent hardness data and instream hardness data, upstream of the discharge, for
each facility monitoring these metals in order to calculate permit limitations. Effluent
hardness and instream hardness sampling, upstream of the discharge, have been added to the
permit at a monitoring frequency of quarterly [See A.(L), A.(2.) and A.(3.)]. The Town of
Wilkesboro reported Total Silver at less than detection, with detection levels < 5.0 µg/L. The
Town's allowable discharge concentration is 1.0 µg/L for Total Silver. DWR's laboratory
identifies the target Practical Quantification Limit (PQL) for Total Silver as 1.0 µg/L. 15A
NCAC 2B .0505 (e) (4) requires that all test procedures must produce detection and reporting
levels that are below the permit discharge requirements and all data generated must be
reported to the approved detection level or lower reporting level of the procedure. If no
approved methods are capable of achieving a detection level below the permit discharge
requirement (or allowable discharge concentration) the method with the lowest detection
level must be used. The Town should use sufficiently sensitive test methods for all pollutants,
including when performing Effluent Pollutant Scans.
• Per Session Law 2005-190 Senate Bill 981, the nutrient loading has been frozen and
Total Nitrogen (TN) and Total Phosphorus (TP) mass -loading have been added to the permit
for the 8.0 MGD flow tier [See A.(3.)].
• For calculation of total nitrogen, monthly monitoring of TKN and NO2+NO3 has been
added to the permit at all flow tiers [See A.(1.), A.(2.) and A.(3.)].
• For calculation of TN and TP Loads, monthly reporting of Total Monthly Flow has been
added to the permit at the 8.0 MGD flow tier [See A.(3.)].
• For clarification on calculation of TN and TP Loads, Total Monthly Flow reporting and
Special Condition A.(6.) Calculation of Total Nitrogen and Total Phosphorous Loads has
been added to the permit.
• As the facility receives complex waste streams from various industrial users with the
potential to discharge 1,4-dioxane via their pretreatment program and the facility discharges
above WS-IV waters, quarterly monitoring for 1,4-dioxane as well as a 1,4-dioxane reopener
condition have been added to the permit [See A.(L), A.(2.), A.(3.) and Special Condition
A.(9.)].
• To assess contributions of PFAS chemicals to the Cub Creek WWTP and assess levels in
the facility effluent, Special Condition A.(11.) has been added to the permit.
• Some of the wording has changed in Special Condition A.(4.), Chronic Toxicity Permit
Limit, please review each paragraph carefully.
• Special Condition A.(5.) has been modified to include the specific three years in which the
Effluent Pollutant Scan shall be performed (2025, 2026, and 2027). In addition, at the end of
the Special Condition, 2nd species Toxicity Testing Requirements for municipal permit
renewals per Federal Regulations [40 CFR 122.210)(5)] have been added.
• A notation was made concerning the Electronic Reporting Rule — NPDES Electronic
Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21,
2025.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
[ See A.(L), A.(2.) and A.(3.)].
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.707.9���
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The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included
in this draft document (cover, map, and Part I). The conditions are the same as in your current
permit except that agency and division names have been updated. The latest version is available at
https:/ibit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Wilkes County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after
receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit, please call me at [phone] or by email at [e-mail].
Sincerely,
EDO
CUSigned by:
00A4FBFCA14FD...
Nick Coco, PE
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Winston-Salem Regional Office/Water Quality/Lon Snider & Jenny Graznak
DWR/Operator Certification Program/Jeff Talbot
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Cindy Moore & Molly Nicholson
DWR/Municipal Permitting Unit/Keyes McGee
HDR Inc./Wes Bramlett, Lara Grotz & Kim Colson
DWI/Ali Ajami
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH CAROLINA 919.707.90�0
gaper .mo F.o. wquay

Permit NCO021717
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
N( PDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended, the
Town of Wilkesboro
is hereby authorized to discharge wastewater from a facility located at the
Cub Creek Wastewater Treatment Plant
700 Snyder Street
Wilkesboro
Wilkes County
to receiving waters designated as the Yadkin River in the Yadkin -Pee Dee River Basin
in accordance with the effluent limitations, monitoring requirements, and other applicable conditions set
forth in Parts I,11, III, and IV hereof.
This permit shall become effective............ Month xx, 20xx.
This permit and authorization to discharge shall expire at midnight on ....................... September 30, 2028.
Signed this day ................... Month xx, 20xx.
DRAFT
Michael J. Montebello, NPDES Permitting Branch Chief
Division of Water Resources
Page 1 of 19

Permit NCO021717
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
permit conditions, requirements, terms, and provisions included herein.
Town of Wilkesboro
is hereby authorized to:
1. Continue to operate and maintain the Cub Creek WWTP, an existing 4.9 MGD facility consisting of
the following components:
• Influent lift station
• Aerated equalization basin
• Aeration basin
• Clarifiers
• Aerated digester
• Ultraviolet disinfection
• Sludge drying beds
• Sludge screw press
• Flow measurement
2. After receiving an Authorization to Construct from the Division, construct and operate improvements
to increase the average design flow of the wastewater treatment facility to 6.6 MGD; and
3. After receiving an Authorization to Construct from the Division, construct and operate improvements
to increase the average design flow of the wastewater treatment facility to 8.0 MGD; and
4. Discharge from said treatment works at the location specified on the attached map via Outfall 001
into the Yadkin River, classified C waters in the Yadkin -Pee Dee River Basin and 03040101 HUC.
Page 2 of 19

Permit NCO021717
PART
A.(L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [4.9 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
(a.) During the period beginning on the effective date of the permit and lasting until expansion above
4.9 MGD or permit expiration, whichever is sooner, the permittee is authorized to discharge treated
municipal and industrial wastewater from Outfall 001. Such discharges shall be limited and
monitored' by the permittee as specified below:
PARAMETER
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locationz
Flow 50050
4.9 MGD
Continuous
Recording
I or E
BOD, 5 day, 200C 3 C0310
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
Total Suspended Solids C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
NH3 as N (Apr 1 - Oct 31) C0610
21.0 mg/L
1 35.0 mg/L
Daily
Composite
E
NH3 as N (Nov 1 - Mar 31) C0610
Monitor and Report
Daily
Composite
E
Fecal Coliform 31616
(geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen 00300
Monitor and Report
Daily
Grab
E
pH 00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
E
Temperature (°C) 00010
Monitor and Report
Daily
Grab
E
Total Residual Chlorine 4 50060
28 µg/L
Daily
Grab
E
Total Phosphorus (mg/L) C0665
Monitor and Report
Monthly
Composite
E
TKN (mg/L) 00625
Monitor and Report
Monthly
Composite
E
NO3-N + NO2-N (mg/L) 00630
Monitor and Report
Monthly
Composite
E
Total Nitrogen 5 (mg/L) C0600
Monitor and Report
Monthly
Calculated
E
Total Selenium 01147
83.1 µg/L 1 1,230 µg/L
Monthly
Composite
E
1,4-Dioxane6 82388
Monitor and Report
Quarterly
Grab
E
PFAS Various
Footnote 7
Footnote 7
Grab
E
Chronic Toxicity' TGP3B
Monitor and Report
Quarterly
Composite
E
Effluent Pollutant Scan 9 NC01
Monitor and Report
Footnote 9
Footnote 9
E
Hardness10 -Total as CaCO3 (mg/L) 00900
Monitor and Report
Quarterly
Composite
E
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A.(11.).
2. Sample locations I -Influent, E-Effluent.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent
total residual chlorine values reported below 50 µg/l to be in compliance with the permit. However, the
permittee shall continue to record and submit all values reported by a North Carolina certified laboratory
(including field certified), even if these values fall below 50 µg/l.
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
6. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved
under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period,
the Permittee may request the Division conduct a review of submitted data for assessment and approval of a
1,4-dioxane monitoring frequency reduction from quarterly to annually.
Footnotes continue on the next page.
Page 3 of 19

Permit NCO021717
Footnotes continued from A.(1.) Effluent Limitations and Monitoring Requirements:
7. See Special Condition A.(11.).
8. Chronic Toxicity (Ceriodaphnia dubia) P/F at 3.7% with testing in March, June, September, and December. See
Special Condition A.(4.).
9. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A.(5.).
10. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 19

Permit NCO021717
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.6 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
(a.) During the period beginning upon expansion to 6.6 MGD and lasting until expansion to 8.0 MGD
or permit expiration, whichever is sooner, the permittee is authorized to discharge treated municipal
and industrial wastewater from Outfall 001. Such discharges shall be limited and monitored' by the
permittee as specified below:
PARAMETER
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locationz
Flow 50050
6.6 MGD
Continuous
Recording
I or E
BOD, 5 day, 200C 3 C0310
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
Total Suspended Solids C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
NH3 as N (Apr 1 - Oct 31) C0610
16.0 mg/L
1 24.0 mg/L
Daily
Composite
E
NH3 as N (Nov 1 - Mar 31) C0610
Monitor and Report
Daily
Composite
E
Fecal Coliform 31616
(geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen 00300
Monitor and Report
Daily
Grab
E
pH 00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
E
Temperature (°C) 00010
Monitor and Report
Daily...
Grab
E
Total Residual Chlorine 4 50060
28 µg/L
Daily
Grab
E
Total Phosphorus (mg/L) C0665
Monitor and Report
Monthly
Composite
E
TKN (mg/L) 00625
Monitor and Report
Monthly
Composite
E
NO3-N + NO2-N (mg/L) 00630
Monitor and Report
Monthly
Composite
E
Total Nitrogen s (mg/L) C0600
Monitor and Report
Monthly
Calculated
E
Total Selenium 01147
62.5 µg/L 1 927.6 µg/L
Monthly
Composite
E
1,4-Dioxane6 82388
Monitor and Report
Quarterly
Grab
E
PFAS Various
Footnote 7
Footnote 7
Grab
E
Chronic Toxicity $ TGP3B
Monitor and Report
Quarterly
Composite
E
Effluent Pollutant Scan 9 NCO]
Monitor and Report
Footnote 9
Footnote 9
E
Hardness10 -Total as CaCO3 (mg/L) 00900
Monitor and Report
Quarterly
Composite
E
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A.(11.).
2. Sample locations I -Influent, E-Effluent.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent
total residual chlorine values reported below 50 µg/l to be in compliance with the permit. However, the
permittee shall continue to record and submit all values reported by a North Carolina certified laboratory
(including field certified), even if these values fall below 50 µg/l.
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
6. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved
under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period,
the Permittee may request the Division conduct a review of submitted data for assessment and approval of a
1,4-dioxane monitoring frequency reduction from quarterly to annually.
7. See Special Condition A.(11.).
Footnotes continue on the next page.
Page 5 of 19

Permit NCO021717
Footnotes continued from A.(2.) Effluent Limitations and Monitoring Requirements:
8. Chronic Toxicity (Ceriodaphnia dubia) P/F at 5.0% with testing in March, June, September, and December. See
Special Condition A.(4.).
9. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A.(5.).
10. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 6 of 19

Permit NCO021717
A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [8.0 MGD]
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
(a.) During the period beginning upon expansion to 8.0 MGD and lasting until permit expiration, the
permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001.
Such discharges shall be limited and monitored' by the permittee as specified below:
PARAMETER
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow 50050
8.0 MGD
Continuous
Recording
I or E
Total Monthly Flow (MG) 82220
Monitor and Report
Monthly
Calculated
E
BOD, 5 day, 20°C 3 C0310
24.4 mg/L
36.6 mg/L
Daily
Composite
I and E
Total Suspended Solids C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
NH3 as N (Apr 1 - Oct 31) C0610
13.3 mg/L
35.0 mg/L
Daily
Composite
E
NH3 as N (Nov 1 - Mar 31) C0610
Monitor and Report
Daily
Composite
E
Fecal Coliform 31616
(geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen 00300
Monitor and Report
Daily
Grab
E
pH 00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
E
Temperature (°C) 00010
Monitor and Report
Daily
Grab
E
Total Residual Chlorine 4 50060
1 1 28 µg/L
Daily
Grab
E
TKN (mg/L) 00625
Monitor and Report
Monthly
Composite
E
NO3-N + NO2-N (mg/L) 00630
Monitor and Report
Monthly
Composite
E
Total Nitrogen s (mg/L) C0600
Monitor and Report
Monthly
Calculated
E
TN Load 6 QM600
QY600
Monitor and Report (lb/month)
205,476 lb/yr
Monthly
Annually
Calculated
E
Total Phosphorus (mg/L) C0665
Monitor and Report
Monthly
Composite
E
TP Load s QM600
QY600
Monitor and Report (lb/month)
109,872 lb/yr
Monthly
Annually
Calculated
E
Total Selenium 01147
52.1 µg/L 1 1 775.1 µg/L
Monthly
Composite
E
1,4-Dioxane7 82388
Monitor and Report
Quarterly
Grab
E
PFAS Various
Footnote 8
Footnote 8
Grab
E
Chronic Toxicity 9 TGP3B
Monitor and Report
Quarterly
Composite
E
Effluent Pollutant Scan 10 NCO]
' Monitor and Report
Footnote 10
Footnote 10
E
Hardness" -Total as CaCO3 (mg/L) 00900
Monitor and Report
Quarterly
Composite
E
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A.(11.).
2. Sample locations I -Influent, E-Effluent.
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
4. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent
total residual chlorine values reported below 50 µg/l to be in compliance with the permit. However, the
permittee shall continue to record and submit all values reported by a North Carolina certified laboratory
(including field certified), even if these values fall below 50 µg/l.
5. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
6. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of time.
See Special Condition A.(6.).
Footnotes continue on the next page.
Page 7 of 19

Permit NCO021717
Footnotes continued from A.(3.) Effluent Limitations and Monitoring Requirements:
7. Samples will be analyzed and reported using sufficiently sensitive test procedures (i.e., methods) approved
under 40 CFR part 136 for the analysis of pollutants or pollutant parameters. After a 24-month sampling period,
the Permittee may request the Division conduct a review of submitted data for assessment and approval of a
1,4-dioxane monitoring frequency reduction from quarterly to annually.
8. See Special Condition A.(11.).
9. Chronic Toxicity (Ceriodaphnia dubia) P/F at 6.0% with testing in March, June, September, and December. See
Special Condition A.(4.).
10. The permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A.(5.).
11. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(4.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B.0500 et seq.]
Beginning on the effective date of this permit and lasting until lasting until permit expiration, the
Permittee shall perform instream sampling upstream and downstream of Outfall 001 as specified below:
PARAMETER
Parameter Code
MONITORING REQUIREMENTS
Measurement
Frequency
Sample Type
Sample Location'
Dissolved Oxygen (mg/L) 00300
Variable
Grab
U
Temperature (°C) 00010
Variable
Grab
U and D
Conductivity (µmhos/cm) 00094
Variable
Grab
U and D
pH (s.u.) 00400
Monthly
Grab
U and D
Fecal Coliform (#/l00mL) 31616
Monthly
Grab
U and D
NH3 as N (mg/L) C0610
Monthly
Grab
U and D
TKN (mg/L) 00625
Monthly
Grab
U and D
NO3-N + NO2-N (mg/L) 00630
Monthly
Calculated
U and D
Total Nitrogen 5 (mg/L) C0600
Monthly
Grab
U and D
Total Phosphorus (mg/L) C0665
Monthly
Grab
U and D
Turbidity (NTUs) 00070
Monthly
Grab
U and D
Hardness -Total as CaCO3 (mg/L) z 00900
Quarterly
Grab
U and D
Fnntnntec!
1. Sample locations U-Upstream = at Wilkesboro Blvd., D-Downstream = 100 yards below the outfall. Upstream
and downstream samples shall be grab samples collected 3/week during June, July, August, and September and
1/week during the remainder of the year. Instream sampling requirements are provisionally waived in light of
the permittee's participation in the Yadkin -Pee Dee River Basin Association. Should participation in the
association cease, all instream sampling requirements are immediately reinstated. Should representative
instream monitoring not be conducted by the Yadkin -Pee Dee River Basin Association, instream monitoring
requirements are immediately reinstated until confirmation of the coalition's activation of such sampling
stations are received by the Division.
2. The permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the stream.
Page 8 of 19

Permit NCO021717
A.(5.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200] [15A NCAC 02B .0500 et seq]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 3.7% at 4.9 MGD, 5.0% at 6.6 MGD
and 6.0% at 8.0 MGD.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," (Revised December 2010, or
subsequent versions) or "North Carolina Phase Il Chronic Whole Effluent Toxicity Test Procedure"
(Revised December 2010, or subsequent versions). The tests will be performed during the months of
March, June, September, and December. These months signify the first month of each three-month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit, then multiple -concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised -December 2010, or subsequent versions).
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed, using the parameter code
TGP313 for the pass/fail results and THP313 for the Chronic Value. Additionally, DWR Form AT-3
(original) is to be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Or, results can be sent to the email, [e-mail].
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the
Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later than
the last day of the month following the month of the initial monitoring.
Page 9 of 19

Permit NCO021717
A.(6.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[G. S. 143-215.1(B)]
(a.) Effluent Pollutant Scans.
The permittee shall perform a total of
three (3)
Effluent Pollutant Scans
for all parameters listed below.
One scan must be performed in each
of the
following years: 2025,
2026, and 2027. Analytical
methods shall be in accordance with
40 CFR Part 136 and shall be
sufficiently sensitive to determine whether parameters are present in concentrations greater than
applicable standards and criteria.
Each annual sample shall coincide with one quarterly toxicity test
each year (see Condition A.(4.)
(CHRONIC TOXICITY PERMIT LIMIT
(QUARTERLY))), and
each must be collected in a
different calendar quarter to represent
seasonal
variation [i.e., do not
sample in the same quarter
every year]. Unless otherwise indicated,
metals shall be analyzed as
"total recoverable."
Ammonia (as N)
C0610
Trans-1,2-dichloroethylene
34546
Bis (2-chloroethyl) ether
34273
Chlorine (total residual, TRC)
50060
1, 1 -dichloroethylene
34501
Bis (2-chloroisopropyl) ether
34283
Dissolved oxygen
00300
1,2-dichloropropane
C0541
Bis (2-ethylhexyl) phthalate
C0100
Nitrate / Nitrite
00630
1,3-dichloropropylene
77163
4-bromophenyl phenyl ether
34636
Kjeldahl nitrogen
00625
Ethylbenzene
34371
Butyl benzyl phthalate
34292
Oil and grease
00556
Methyl bromide
34413
2-chloronaphthalene
34581
Phosphorus
C0665
Methyl chloride
34418
4-chlorophenyl phenyl ether
34641
Total dissolved solids
70295
Methylene chloride
34423
Chrysene
34320
Hardness
00900
1,1,2,2-tetrachloroethane
81549
Di-n-butyl phthalate
39110
Antimony
01097
Tetrachloroethylene
34475
Di-n-octyl phthalate
34596
Arsenic
01002
Toluene
34010
Dibenzo(a,h)anthracene
34556
Beryllium
01012
1, 1, 1 -trichloroethane
34506
1,2-dichlorobenzene
34536
Cadmium
01027
1,1,2-trichloroethane
34511
1,3-dichlorobenzene
34566
Chromium
C0034
Trichloroethylene
39180
1,4-dichlorobenzene
34571
Copper
01042
Vinyl chloride
39175
3,3-dichlorobenzidine
34631
Lead
01051
Acid -extractable compounds:
Diethyl phthalate
34336
Mercury (Method 1631E)
COMER
P-chloro-m-cresol
34452
Dimethyl phthalate
34341
Nickel
01067
2-chlorophenol
34586
2,4-dinitrotoluene
34611
Selenium
01147
2,4-dichlorophenol
34601
2,6-dinitrotoluene
C0626
Silver (PQL < 1 µg/L)
01077
2,4-dimethylphenol
34606
1,2-diphenylhydrazine
34346
Thallium
01059
4,6-dinitro-o-cresol
34657
Fluoranthene
C0376
Zinc
01092
2,4-dinitrophenol
34616
Fluorene
34381
Cyanide
00720
2-nitrophenol
34591
Hexachlorobenzene
C0700
Total phenolic compounds
32730
4-nitrophenol
34646
Hexachlorobutadiene
C0702
Volatile organic compounds:
Pentachlorophenol
39032
Hexachlorocyclo-pentadiene
34386
Acrolein
34210
Phenol
34694
Hexachloroethane
34396
Acrylonitrile
34215
2,4,6-trichlorophenol
34621
Indeno(1,2,3-cd)pyrene
34403
Benzene
34030
Base -neutral compounds:
Isophorone
34408
Bromoform
32104
Acenaphthene
34205
Naphthalene
34696
Carbon tetrachloride
32102
Acenaphthylene
34200
Nitrobenzene
34447
Chlorobenzene
34301
Anthracene
CO220
N-nitrosodi-n-propylamine
34428
Chlorodibromomethane
34306
Benzidine
39120
N-nitrosodimethylamine
34438
Chloroethane
85811
Benzo(a)anthracene
C0526
N-nitrosodiphenylamine
34433
2-chloroethyl vinyl ether
34576
Benzo(a)pyrene
34247
Phenanthrene
34461
Chloroform
32106
3,4 benzofluoranthene
34230
Pyrene
34469
Dichlorobromomethane
32101
Benzo(ghi)perylene
34521
1,2,4-trichlorobenzene
C0551
1, 1 -dichloroethane
34496
Benzo(k)fluoranthene
34242
1,2-dichloroethane
32103
Bis (2-chloroethoxy) methane
34278
Page 10 of 19

Permit NC0021717
(b.) Effluent Scan Reporting. Test results shall be reported electronically via eDMR by December
31 st of each designated sampling year, except that, subject to prior written approval by the Director,
results can be reported on DWR Form DMR-PPA-1 or other form approved by the Director. The
permittee must at least report completion of the test in the eDMR system by entering " 1 " or "Y" for
parameter code NCO 1 - Annual Pollutant Scan. If written reports are approved, the report shall be
submitted to the following address:
North Carolina Division of Water Resources
Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Or the form may be uploaded at: https:Hedocs.deq.nc.gov/Forms/NPDES_WW-EDMR-
Supplemental-Form
(c.) 2nd-Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in Condition A.(4.) (CHRONIC TOXICITY
PERMIT LIMIT (QUARTERLY)), the Permittee shall perform and report the results of four
(4) toxicity tests using the same test methods using a second species of test organism suitable
to the tests being conducted.
(ii.) The 2nd species toxicity tests shall be conducted either:
(A) Once per quarter in a single 12-month period (four samples); if this option is chosen,
the sample for each 2nd species test shall coincide with the quarterly samples collected
for (CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)); or
(B) Once per 12-month period in the four -and one-half year period prior to the scheduled
application for permit renewal (four samples); if this option is chosen, three of the
samples for the 2nd species test shall coincide with those for the annual effluent scans
and the coincident quarterly toxicity test, and each of the four annual samples shall be
collected in a different calendar quarter in order to represent seasonal variation.
(iii.) The results of the toxicity tests shall be submitted to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Or, results can be sent to the email, ATForms.ATB@ deq.nc.gov.
(iv.) Results of the 2nd species tests shall also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A when submitting the permit renewal application to the
NPDES Wastewater Program.
The Permittee may contact the Division's Aquatic Toxicology Branch at 919-743-8401 for
guidance on conducting the additional toxicity tests and reporting of the results.
Page 11 of 19

Permit NCO021717
A.(7.) CALCULATION OF TOTAL NITROGEN AND TOTAL PHOSPHOROUS LOADS
[G.S. 143-215.1(b)]
(a.) The Permittee shall calculate monthly and annual TN and TP Loads as follows:
(i.) Monthly TN (or TP) Load (lb/mo) = TN (or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorous concentration (mg/L)
of the composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the month
(MG/mo); and
8.34 — conversion factor, from (mg/L x MG) to pounds
(ii.) Annual TN (or TP) Load (lb/yr) = Sum of the 12 Monthly TN (or TP) Loads for the calendar
year
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo)
in the discharge monitoring report for that month and shall report each year's annual results (lb/yr)
in the December report for that year.
A.(8.) MERCURY MINIMIZATION PLAN (MMP) ,
[G.S. 143-215.1 (B)]
The Permittee shall maintain and continue to implement the Mercury Minimization Plan (MMP)
developed in the previous permit term. The MMP shall continue to be available for inspection on -site.
The MMP should place emphasis on identification of mercury contributors and goals for reduction.
Results shall be summarized and submitted with the next permit renewal. Performance of the MMP will
meet the requirements of the TMDL (Total Maximum Daily Load) for mercury approved by USEPA on
October 12, 2012, unless and until a Waste Load Allocation specific to this facility is developed and this
NPDES permit is amended to require further actions to address the Waste Load Allocation.
A.(9.) NUTRIENT REOPENER FOR HIGH ROCK LAKE
[G.S. 143-215.1 (B)]
This permit may be reopened and modified to implement nutrient requirements in accordance with any
future TMDL and/or nutrient management strategy for High Rock Lake.
A.(10.) 1,4-DIOXANE RE -OPENER
[G.S. 143-215.1 (B)]
Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in the North
Carolina Administrative Code at 15A NCAC 2H.0112 (b) (1) and 2H.0114 (a) and Part 11, Sections B- 12
and B-13 of this permit, the Director of DWR may reopen this permit to modify permit requirements to
address 1,4-Dioxane monitoring, treatment and/or compliance.
Page 12 of 19

Permit NCO021717
A.(11.) PFAS MONITORING REQUIREMENT
[G.S. 143-215.1 (b)]
(a.) In the absence of an approved 40 CFR Part 136 method published in Federal Register, influent and
effluent PFAS monitoring shall be conducted. The 3rd draft or more recent wastewater analytical
method 1633 (see 40 CFR 122.21(e)(3)(ii) and 40 CFR 122.44(i)(1)(iv)(B)) shall be used and shall
include all target analytes listed under Table 1 of the method until such time as the Permittee uses the
approved PFAS Method for wastewater. Effective the first full calendar quarter following six (6)
months after EPA publishes a 40 CFR Part 136 PFAS Method for wastewater in the Federal Register,
influent and effluent PFAS monitoring shall be conducted using the approved EPA PFAS Method
1633. See Appendix A for list of analytes.
(b) Influent and effluent monitoring using the draft analytical method takes effect the first full
calendar quarter following six (6) months after the effective date of the permit (Month xx, 2024)
and will be at a quarterly frequency thereafter.
Appendix A has been added to the permit to identify the current analytes listed under Table 1 of
Method 1633 Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid,
Biosolids, and Tissue Samples by LC-MS/MS (EPA, January 2024) and the appropriate ICIS codes
for use when reporting in the electronic Discharge Monitoring Reports (eDMRs). The method and
list of analytes may also be found at:
https://www.epa.gov/system/files/documents/2024-01/method-1633-final-for-web-posting.pdf
PFAS Monitoring using the Draft Method or January 2024 Method 1633 shall be reported quarterly
using the Division -provided submittal form and shall be submitted to the following address:
NCDEQ / Division of Water Resources
NPDES Permitting
1617 Mail Service Center
Raleigh, NC 27699-1617
NCDEQ / Division of Water Resources
Winston-Salem Regional Office
450 West Hanes Mill Road, Suite 300
Winston-Salem, NC 27105
Once PFAS monitoring is conducted using the PFAS Method 1633 in 40 CFR Part 136, data shall
be reported in the monthly eDMRs.
Please note that specific considerations and protocols are required to avoid cross -contamination and
minimize sample bias for PFAS. A current listing of laboratories accredited by the Perry Johnson
Laboratory Accreditation, Inc. (PJLA), ANSI National Accreditation Board (ANAB), or the
American Association for Laboratory Accreditation (A2LA) to perform EPA Method 1633 can be
found by contacting the individual associations. Please note that different labs are accredited for
different matrices.
Sampling and Analytical Notes:
• Sampling shall be planned so that required holding times for analytical methods are met.
• Using one of the analytical laboratories included above will allow consistency in analytical
method and in anticipation of a final method.
• "J" flag values shall be reported when the "J" flag value is associated with the method's upper
bound. "J" flag values need not be reported when less than the method's Minimum Reporting Level
(listed in Method 1633).
• Laboratories approved for Aqueous matrix may be utilized. Please note that the lab used does not
have to be in North Carolina.
Page 13 of 19

Permit NCO021717
A.(12.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,
2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted monthly electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. The eDMR system may be
accessed at: https:Hdeq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access, then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1. 1, 2, 3) or alternative
forms approved by the Director. Duplicate signed copies shall be submitted to the following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See "How to Request a Waiver from Electronic Reporting" section below.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
reported via the eDMR system no later than the last calendar day of the month following the
completed reporting period. Regardless of the submission method, the first DMR is due on the last
day of the month following the issuance of the permit or in the case of a new facility, on the last day
of the month following the commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Sewer Overflow/Bypass Event Reports; and
Pretreatment Program Annual Reports; and
Clean Water Act (CWA) Section 316(b) Annual Reports.
Page 14 of 19

Permit NC0021717
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time of
each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: https://www.federalregister.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty (60) days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports. The duration of a temporary
waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data and reports
shall be submitted electronically to the Division unless the permittee re -applies for and is granted a
new temporary electronic reporting waiver by the Division. Approved electronic reporting waivers
are not transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved reporting waiver
request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (I 1.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (I 1.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following
web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 15 of 19

Permit NC0021717
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.221. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
'7 certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the information,
the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations. "
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41 ].
Page 16 of 19

Permit NCO021717
Lt
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A
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Upstream . . . . . . . ......
'Y
Outfall a 1
N.
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4
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v
I
V,
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OD
I-'
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Latitude: Sub -Basin: 03-07-01
Facility
Langitude 91'09'20
Location
Quad# CANW, Wilkesbaro
Stream Class: C
Receivin Stream- Yadkin River
Permitted Flow- 49 MG D, 66 MG D, & 80 Mr. D
Town of Wilkesboro
North
Wilkesboro WRF
Page 17 of 19

Permit NCO021717
Appendix A. PFAS Target Analytes EPA Method 1633
(EPA, January 2024)
Target Analyte Name
Abbreviation
CAS Number
Parameter
Code
Perfluoroalkyl carboxylic acids
Perfluorobutanoic acid
PFBA
375-22-4
51522
Perfluoropentanoic acid
PFPeA
2706-90-3
51623
Perfluorohexanoic acid
PFHxA
307-24-4
51624
Perfluoroheptanoic acid
PFHpA
375-85-9
51625
Perfluorooctanoic acid
PFOA
335-67-1
51521
Perfluorononanoic acid
PFNA
375-95-1
51626
Perfluorodecanoic acid
PFDA
335-76-2
51627
Perfluoroundecanoic acid
PFUnA
2058-94-8
51628
Perfluorododecanoic acid
PFDoA
307-55-1
51629
Perfluorotridecanoic acid
PFTrDA
72629-94-8
51630
Perfluorotetradecanoic acid
PFTeDA
376-06-7
51531
Perfluoroalkyl sulfonic acids
Perfluorobutanesulfonic acid
PFBS
375-73-5
52602
Perfluoropentanesulfonic acid
PFPeS
2706-91-4
52610
Perfluorohexanesulfonic acid
PFHxS
355-46-4
52605
Perfluoroheptanesulfonic acid
PFHpS
375-92-8
52604
Perfluorooctanesulfonic acid
PFOS
1763-23-1
52606
Perfluorononanesulfonic acid
PFNS
68259-12-1
52611
Perfluorodecanesulfonic acid
PFDS
335-77-3
52603
Perfluorododecanesulfonic acid
PFDoS
79780-39-5
52632
Fluorotelomer sulfonic acids
1H,1H,2H,2H-Perfluorohexane sulfonic acid
4:2FTS
757124-72-4
52607
1H,1H,2H,2H-Perfluorooctane sulfonic acid
6:2FTS
27619-97-2
52608
1H,1H,2H,2H-Perfluorodecane sulfonic acid
8:2FTS
39108-34-4
52609
Perfluorooctane sulfonamides
Perfluorooctanesulfonamide
PFOSA
754-91-6
51525
N-methyl perfluorooctanesulfonamide
NMeFOSA
31506-32-8
52641
N-ethyl perfluorooctanesulfonamide
NEtFOSA
4151-50-2
52642
Table continues on next page.
Page 18 of 19

Permit NCO021717
Table continued from Appendix A. PFAS Target Analytes EPA Method 1633 (EPA, January 2024).
Target Analyte Name
Abbreviation
CAS Number
Parameter
Code
Perfluorooctane sulfonamidoacetic acids
N-methyl perfluorooctanesulfonamidoacetic acid
NMeFOSAA
2355-31-9
51644
N-ethyl perfluorooctanesulfonamidoacetic acid
NEtFOSAA
2991-50-6
51643
Perfluorooctane sulfonamide ethanols
N-methyl perfluorooctanesulfonamidoethanol
NMeFOSE
24448-09-7
51642
N-ethyl perfluorooctanesulfonamidoethanol
NetFOSE
1691-99-2
51641
Per- and Polyfluorother carboxylic acids
Hexafluoropropylene oxide dimer acid
HFPO-DA
13252-13-6
52612
4,8-Dioxa-3H-perfluorononanoic acid
ADONA
919005-14-4
52636
Perfluoro-3-methoxypropanoic acid
PFMPA
377-73-1
PF002
Perlfuoro-4-methoxybutanoic acid
PFMBA
863090-89-5
PF006
Nonafluoro-3,6-dioxaheptanoic acid
NFDHA
151772-58-6
52626
Ether sulfonic acids
9-Chlorohexadecafluoro-3-oxanonane-l-sulfonic acid
9C1-PF3ONS
756426-58-1
PF003
11-Chloroeicosafluoro-3-oxaundecane-l-sulfonic acid
11C1-PF3OUdS
763051-92-9
PF004
Perfluoro(2-ethoxyethane)sulfonic acid
PFEESA
113507-82-7
52629
Fluorotelomer carboxylic acids
3-Perfluoropropyl propanoic acid
3:3FTCA
356-02-5
PF001
2H,2H,3H,3H-Perfluorooctanoic acid
5:3FTCA
914637-49-3
PF007
3-Perfluoroheptyl propanoic acid
7:3FTCA
812-70-4
PF005
Page 19 of 19