Chloromethane

City of Atwater

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	18	ND
2014	ND	4	ND
2015	N/A	0	N/A
2016	ND	8	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	N/A	0	N/A

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

Date	Lab ID	Result
2013-02-26	A3B1738-07A	ND
2013-02-26	A3B1738-04A	ND
2013-02-26	A3B1738-01A	ND
2013-03-07	A3C0077-13A	ND
2013-03-07	A3C0077-16A	ND
2013-03-07	A3C0077-01A	ND
2013-03-07	A3C0077-04A	ND
2013-03-07	A3C0077-10A	ND
2013-03-07	A3C0077-07A	ND
2013-08-20	A3H1421-19A	ND
2013-08-20	A3H1421-25A	ND
2013-08-20	A3H1421-22A	ND
2013-08-20	A3H1421-10A	ND
2013-08-20	A3H1421-01A	ND
2013-08-20	A3H1421-07A	ND
2013-08-20	A3H1421-13A	ND
2013-08-20	A3H1421-16A	ND
2013-09-26	A3I1633-01A	ND
2014-03-12	5806-903-0910	ND
2014-03-12	5806-902-0935	ND
2014-03-12	5806-901-0815	ND
2014-03-12	5806-900-0735	ND
2016-03-23	5806-013-0630	ND
2016-03-23	5806-021-1000	ND
2016-03-23	5806-019-0930	ND
2016-03-23	5806-018-0900	ND
2016-03-23	5806-017-0830	ND
2016-03-23	5806-016-0800	ND
2016-03-23	5806-015-0730	ND
2016-03-23	5806-014-0700	ND