Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 809 - Safe Drinking Water
Subchapter I - Maximum Contaminant Levels, Monitoring and Analytical Requirements for Primary Drinking Water Contaminants
Section NR 809.24 - Volatile organic contaminant maximum contaminant levels and BATS
Current through August 26, 2024
(1) APPLICABILITY. The following maximum contaminant levels for volatile organic contaminants (VOC) apply to community water systems and non-transient, non-community water systems.
| Contaminant | MCL (mg/L) |
| Benzene | 0.005 |
| Vinyl chloride | 0.0002 |
| Carbon tetrachloride | 0.005 |
| 1,2-Dichloroethane | 0.005 |
| Trichloroethylene | 0.005 |
| 1,1-Dichloroethylene | 0.007 |
| 1,1,1-Trichloroethane | 0.20 |
| para-Dichlorobenzene | 0.075 |
| cis-1,2-Dichloroethylene | 0.07 |
| trans-1,2-Dichloroethylene | 0.1 |
| Dichloromethane | 0.005 |
| 1,2-Dichloropropane | 0.005 |
| Ethylbenzene | 0.7 |
| Monochlorobenzene | 0.1 |
| ortho-Dichlorobenzene | 0.6 |
| Styrene | 0.1 |
| Tetrachloroethylene | 0.005 |
| Toluene | 1 |
| 1,2,4-Trichlorobenzene | 0.07 |
| 1,1,2-Trichloroethane | 0.005 |
| Xylenes (total) | 10 |
(2) BEST AVAILABLE TREATMENT. The following are the BATs available for achieving compliance with the maximum contaminant level for the volatile organic chemicals listed in sub. (1):
(3) ALTERNATIVE TREATMENT. The department may approve the use of alternative treatment not listed in sub. (2), if a water supplier demonstrates to the department, using pilot studies or other means, that the alternative treatment is sufficient to achieve compliance with the MCLs in sub. (1).
