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 809.25 - Special monitoring and reporting for selected organic contaminants and sulfate

Universal Citation: WI Admin Code § NR 809.25

Current through August 26, 2024

(1) GENERAL.

(a) Community systems with populations of 10,000 and greater shall be monitored for the contaminants listed in pars. (e) and (f) on a schedule to be determined by the department. Community water systems with populations less than 10,000 and non-transient, non-community water systems shall be monitored for the contaminants listed in pars. (e) and (f) at the discretion of the department.

(b) Surface water systems shall be sampled at the entry points to the distribution system after any application of treatment. The minimum number of samples is one year of quarterly samples per water source.

(c) Groundwater systems shall be sampled at points of entry to the distribution system representative of each well after any application of treatment. The minimum number of samples is one sample per entry point to the distribution system.

(d) The department may require confirmation and follow-up samples for positive or negative results.

(e) List of unregulated volatile organic compounds:

Chloroform

Bromoform

Chlorodibromomethane

Bromodichloromethane

Bromobenzene

Bromomethane

Chloromethane

Chloroethane

o-Chlorotoluene

p-Chlorotoluene

Dibromomethane

m-Dichlorobenzene

1,1-Dichloropropene

1,1-Dichloroethane

1,3-Dichloropropane

2,2-Dichloropropane

1,3-Dichloropropene

1,1,1,2-Tetrachloroethane

1,1,2,2-Tetrachloroethane

1,2,3-Trichloropropane

1,2,4-Trimethylbenzene

1,2,3-Trichlorobenzene

n-Propylbenzene

n-Butylbenzene

Naphthalene

Hexachlorobutadiene

1,3,5-Trimethylbenzene

p-Isopropyltoluene

Isopropylbenzene

Tert-butylbenzene

Sec-butylbenzene

Fluorotrichloromethane

Dichlorodifluoromethane

Bromochloromethane

Methyl-t-butyl ether (MTBE)

(f) List of unregulated synthetic organic contaminants:

Aldrin

Aldicarb

Aldicarb Sulfoxide

Aldicarb Sulfone

Butachlor

Carbaryl

Dicamba

Dieldrin

3-Hydroxycarbofuran

Methomyl

Metolachlor

Metribuzin

Propachlor

(g) Analysis under this section shall be conducted by a laboratory certified under ch. NR 149 using EPA methods 502.2, 524.2, 524.3, 551.1 for contaminants listed in par. (e) and EPA methods listed in s. NR 809.203, Table CM for contaminants listed in par. (f).

(2) SULFATE MONITORING. Monitoring for sulfate shall be conducted as required by the department.

(3) REPORTING REQUIREMENTS. Reporting requirements under this section shall be as required under s. NR 809.80.

(4) TREATMENT TECHNIQUES FOR ACRYLAMIDE AND EPICHLOROHYDRIN. In lieu of MCLs and monitoring for acrylamide and epichlorohydrin, the following treatment techniques and reporting are required. Each water supplier for public water system shall certify annually in writing to the department using third party or manufacturer's certification, that when acrylamide and epichlorohydrin are used in the treatment of drinking water, the combination, or product, of dose and monomer level does not exceed the levels specified as follows:

(a) Acrylamide = 0.05% dosed at 1 ppm or equivalent.

(b) Epichlorohydrin = 0.01% dosed at 20 ppm or equivalent.

Disclaimer: These regulations may not be the most recent version. Wisconsin may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.

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