Chloromethane

Stillwater

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	4	ND
2015	ND	9	ND
2016	ND	8	ND
2017	N/A	0	N/A
2018	ND	7	ND
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
2013-12-19	1064707006	ND
2013-12-19	1064707003	ND
2013-12-19	1064707009	ND
2014-06-05	2011039003	ND
2014-06-05	2011039006	ND
2014-06-05	2011039009	ND
2014-11-06	14K0292-01	ND
2015-02-25	15B1195-02	ND
2015-02-25	15B1197-03	ND
2015-02-25	15B1197-01	ND
2015-02-25	15B1195-01	ND
2015-02-25	15B1195-03	ND
2015-02-25	15B1195-04	ND
2015-02-25	15B1197-02	ND
2015-06-22	2078487001	ND
2015-12-09	2112835001	ND
2016-04-06	3426143	ND
2016-04-06	3426231	ND
2016-04-06	3426220	ND
2016-04-06	3426179	ND
2016-04-06	3426170	ND
2016-04-06	3426108	ND
2016-07-12	3491724	ND
2016-07-12	3491777	ND
2018-10-29	18J1468-01	ND
2018-10-29	18J1468-02	ND
2018-10-29	18J1468-03	ND
2018-10-29	18J1469-01	ND
2018-10-29	18J1469-02	ND
2018-10-29	18J1469-03	ND
2018-10-29	18J1469-04	ND