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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Mountain Water Company

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

 

127

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND160ND
2014ND250ND
2015ND280ND
2016ND160ND
2017ND170ND
2018ND130ND
2019ND120ND

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
2013-05-07718194-8788ND
2013-05-08718433-8788ND
2013-05-14719518-8818ND
2013-05-14719520-8818ND
2013-05-14719477-8831ND
2013-05-15719821-8831ND
2013-05-15719823-8831ND
2013-05-21720742-8898ND
2013-11-19759535-10322ND
2013-11-19759549-10322ND
2013-11-19759553-10322ND
2013-11-20759882-10330ND
2013-11-20759880-10330ND
2013-11-25760469-10340ND
2013-11-25760458-10351ND
2013-11-25760466-10351ND
2014-05-20790747-11434ND
2014-05-20790729-11453ND
2014-05-20790731-11453ND
2014-05-20790745-11434ND
2014-05-21791855-11450ND
2014-05-21791853-11450ND
2014-05-21792082-11460ND
2014-09-18B14091884-005AND
2014-09-18B14091884-005BND
2014-09-18B14091884-005CND
2014-10-13B14101125-005AND
2014-10-13B14101125-005BND
2014-10-13B14101125-005CND
2014-10-29B14102506-005AND
2014-10-29B14102506-005BND
2014-10-29B14102506-005CND
2014-11-05830254-12807ND
2014-11-05830252-12807ND
2014-11-05830258-12820ND
2014-11-05830250-12807ND
2014-11-05830256-12807ND
2014-11-24832941-12914ND
2014-11-24832943-12914ND
2014-12-01B14120125-001AND
2014-12-01B14120125-002AND
2015-02-26B15022051-001CND
2015-02-26B15022051-002CND
2015-05-06858619-14037ND
2015-05-06858624-14037ND
2015-05-06858627-14037ND
2015-05-06858622-14037ND
2015-05-12859529-14080ND
2015-05-12859527-14080ND
2015-05-12859531-14080ND
2015-09-23B15092184-006AND
2015-09-23B15092184-006BND
2015-09-23B15092184-006CND
2015-09-23B15092184-006DND
2015-10-08B15100826-006AND
2015-10-08B15100826-006BND
2015-10-08B15100826-007AND
2015-10-08B15100826-008AND
2015-11-04B15110444-006AND
2015-11-04B15110444-006BND
2015-11-04B15110444-006CND
2015-11-04B15110444-006DND
2015-11-09893224-15395ND
2015-11-09893228-15395ND
2015-11-09893222-15395ND
2015-11-09893226-15395ND
2015-11-09893230-15395ND
2015-11-10893564-15395ND
2015-11-17894625-15427ND
2016-05-24B16051932-001BND
2016-08-23B16082328-001BND
2016-09-14B16091275-006AND
2016-09-14B16091275-006BND
2016-09-14B16091275-006CND
2016-09-14B16091275-006DND
2016-09-21B16091896-007AND
2016-09-21B16091896-007BND
2016-09-21B16091896-007CND
2016-09-21B16091896-007DND
2016-09-28B16092451-005AND
2016-09-28B16092451-005BND
2016-09-28B16092451-005CND
2016-10-18B16101448-002AND
2016-10-18B16101448-003AND
2016-10-18B16101448-004AND
2017-03-08H17030154-001FND
2017-03-08H17030156-001FND
2017-03-08H17030158-001FND
2017-09-13B17091233-001BND
2017-09-13B17091233-006AND
2017-10-24B17102253-001DND
2017-10-24B17102253-002DND
2017-10-24B17102253-003DND
2017-10-24B17102253-004DND
2017-11-01B17110168-001CND
2017-11-01B17110168-002CND
2017-11-01B17110168-003CND
2017-11-01B17110168-004DND
2017-11-21B17111863-001CND
2017-11-21B17111863-002CND
2017-11-21B17111863-003CND
2017-11-21B17111863-004CND
2018-05-15B18051508-001FND
2018-05-15B18051514-001FND
2018-05-23B18052237-001GND
2018-06-05B18060423-001GND
2018-06-19B18061823-001FND
2018-07-17B18071571-001GND
2018-07-17B18071604-001GND
2018-07-18B18071741-001GND
2018-07-18B18071799-001GND
2018-07-31B18080102-001BND
2018-09-05B18090357-001GND
2018-09-05B18090419-001AND
2018-09-05B18090421-001AND
2019-05-07B19050690-001BND
2019-05-14B19051387-001GND
2019-05-22B19052006-001FND
2019-06-04B19060314-001GND
2019-06-11B19061058-001FND
2019-06-18B19061773-001FND
2019-07-09B19070912-002AND
2019-07-17B19071738-001GND
2019-07-23B19072150-001FND
2019-08-07B19080745-001GND
2019-08-13B19081351-001GND
2019-08-20B19082022-001GND