Chloromethane

Nipomo Comm. Services District

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	8	ND
2014	ND	16	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	ND	4	ND
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
2013-12-16	A3L0282-05A	ND
2013-12-16	A3L0282-07A	ND
2013-12-16	A3L0282-01A	ND
2013-12-16	A3L0282-15A	ND
2013-12-16	A3L0282-17A	ND
2013-12-16	A3L0282-11A	ND
2013-12-16	A3L0282-09A	ND
2013-12-16	A3L0282-13A	ND
2014-04-09	A4D0001-01A	ND
2014-06-23	A4F0025-19A	ND
2014-06-23	A4F0025-10A	ND
2014-06-23	A4F0025-13A	ND
2014-06-23	A4F0025-01A	ND
2014-06-23	A4F0025-04A	ND
2014-06-23	A4F0025-22A	ND
2014-06-23	A4F0025-25A	ND
2014-07-23	5867-033-1045	ND
2014-07-23	5867-021-1210	ND
2014-07-23	5867-020-1235	ND
2014-07-23	5867-015-1120	ND
2014-07-23	5867-008-1200	ND
2014-07-23	5867-004-1015	ND
2014-07-23	5867-002-1000	ND
2014-12-23	5867-005-1245	ND
2017-07-11	5867-015-1215	ND
2017-07-11	5867-033-1100	ND
2017-07-11	5867-021-1120	ND
2017-07-11	5867-020-1145	ND