Chloromethane

Shorewood Waterworks

NOTE: Shorewood Waterworks purchases water from Milwaukee Waterworks which is required to test for chloromethane. Sample information shown below was taken by Milwaukee Waterworks.

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	ND	3	ND
2014	ND	1	ND
2015	ND	6	ND
2016	ND	2	ND
2017	ND	2	ND
2018	ND	2	ND
2019	ND	2	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

NOTE: Shorewood Waterworks purchases water from Milwaukee Waterworks which is required to test for chloromethane. Sample information shown below was taken by Milwaukee Waterworks.

Date	Lab ID	Result
2013-02-11	2777868	ND
2013-02-12	2778882	ND
2013-05-06	2819854	ND
2013-05-06	2819869	ND
2013-08-05	2869981	ND
2013-08-05	2869993	ND
2013-11-04	2924675	ND
2013-11-04	2924749	ND
2014-08-18	3085065	ND
2014-08-19	3086089	ND
2014-08-21	3088713	ND
2014-08-21	3088626	ND
2014-08-21	3088583	ND
2014-08-21	3088685	ND
2015-08-17	3302522	ND
2015-08-17	3302447	ND
2015-08-17	3302556	ND
2015-08-17	3302481	ND
2015-08-18	3303599	ND
2015-08-19	3304985	ND
2016-08-22	3528615	ND
2016-08-22	3528603	ND
2017-08-21	3762068	ND
2017-08-21	3762286	ND
2018-08-21	4030658	ND
2018-08-21	4030673	ND
2019-08-12	4383517	ND
2019-08-12	4383513	ND