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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Regional Water Authority

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND380ND
2015ND110ND
2016ND100ND
2017ND120ND
2018ND100ND
2019ND110ND

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
2014-01-21200389855 AND
2014-01-21200389843 AND
2014-01-21200389853 AND
2014-01-21200389841 AND
2014-01-21200389839 AND
2014-01-21200389845 AND
2014-01-21200389837 AND
2014-01-21200389833 AND
2014-01-21200389835 AND
2014-01-22200389861 AND
2014-03-04VOC1 200391964ND
2014-03-04VOC1 200391963ND
2014-03-04VOC1 200391965ND
2014-03-04VOC1 200391977ND
2014-03-04VOC1 200392005ND
2014-03-04VOC1 200391978ND
2014-03-04VOC1 200391979ND
2014-03-04VOC1 200391980ND
2014-03-04VOC1 200392007ND
2014-03-25VOC1 200393100ND
2014-04-29200394927ND
2014-04-29200394919ND
2014-04-29200394923ND
2014-04-29200394914ND
2014-07-15200399798ND
2014-07-15200399799ND
2014-07-15200399792ND
2014-07-15200399797ND
2014-07-15200399800ND
2014-07-15200399796ND
2014-07-15200399794ND
2014-07-15200399795ND
2014-07-15200399801ND
2014-07-15200399793ND
2014-10-21200406621ND
2014-10-21200406619ND
2014-10-21200406625ND
2014-10-21200406627ND
2015-03-03VOC1 200412900ND
2015-03-03VOC1 200412899ND
2015-03-03VOC1 200412902ND
2015-03-03VOC1 200412879ND
2015-03-03VOC1 200412881ND
2015-03-03VOC1 200412907ND
2015-03-03VOC1 200412923ND
2015-03-04VOC1 200413022ND
2015-03-10VOC1 200413328ND
2015-03-18VOC1 200413713ND
2015-12-04VOC1 200429711ND
2016-02-29VOC1 200434372ND
2016-02-29VOC1 200434371ND
2016-02-29VOC1 200434387ND
2016-02-29VOC1 200434386ND
2016-03-01VOC1 200434428ND
2016-03-01VOC1 200434431ND
2016-03-01VOC1 200434429ND
2016-03-01VOC1 200434430ND
2016-03-01VOC1 200434474ND
2016-03-03VOC1 200434800ND
2017-02-27VOC1 200461316ND
2017-02-27VOC1 200461317ND
2017-02-27VOC1 200461301ND
2017-02-28VOC1 200461371ND
2017-02-28VOC1 200461369ND
2017-02-28VOC1 200461372ND
2017-02-28VOC1 200461370ND
2017-02-28VOC1 200461405ND
2017-02-28VOC1 200461407ND
2017-03-02VOC1 200461633ND
2017-06-19VOC1 200469687ND
2017-06-19VOC1 200469688ND
2018-03-05VOC1 200489156ND
2018-03-05VOC1 200489128ND
2018-03-05VOC1 200489129ND
2018-03-05VOC1 200489150ND
2018-03-06VOC1 200489296ND
2018-03-06VOC1 200489298ND
2018-03-06VOC1 200489295ND
2018-08-17VOC1 200502735ND
2018-11-29VOC1 200514121ND
2018-11-29VOC1 200514106ND
2019-03-04VOC1 200523176ND
2019-03-04VOC1 200523175ND
2019-03-04VOC1 200523151ND
2019-03-04VOC1 200523150ND
2019-03-05VOC1 200523253ND
2019-03-05VOC1 200523286ND
2019-03-05VOC1 200523251ND
2019-03-05VOC1 200523254ND
2019-03-05VOC1 200523252ND
2019-03-05VOC1 200523284ND
2019-05-08VOC1 200531298ND