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IMAC Table January 2024
Effective Date: April 1, 2022 Table Updated November 4, 2022; January 18, 2024 Appendix: Groundwater Interim Maximum Allowable Concentrations (IMACs) Substance Concentration (µg/L) Ammonia 1,500 Bentazon 200 Benzaldehyde 700 Boscalid 2,000 tert-Butanol (tert-butyl alcohol) 10 Carbazole 2 Dibenzofuran 28 Dibromomethane 70 1,2-Dichloroethylene, mixed isomers 60 Ethanol (ethyl alcohol) 4,000 Ethyl tert-butyl ether (ETBE) 47 Fluometuron 90 Metolachlor 700 Perchlorate & Perchlorate Salts 2 Picramic Acid 0.7 Polychlorinated Biphenyls 0.09 Tert-Amyl Methyl Ether (TAME) 128 Tetrahydrofuran 2,000 p-Toluic Acid 35 Vinyl Acetate 88 Interim Maximum Allowable Concentrations (IMACs) shown in the table below are those established under 15A NCAC 02L .0202. For more information, visit: https://deq.nc.gov/about/divisions/water-resources/planning/classification-standards