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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

City of Ripon

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND90ND
2014N/A00N/A
2015ND40ND
2016ND30ND
2017ND20ND

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
2012-06-132625-007-0927ND
2012-06-132625-003-0725ND
2012-06-132625-022-1013ND
2012-07-182625-024-1040ND
2013-06-262625-010-1425ND
2013-10-292625-020-0935ND
2013-12-18A3L0672-09AND
2013-12-18A3L0672-13AND
2013-12-18A3L0672-03AND
2013-12-18A3L0672-01AND
2013-12-18A3L0672-07AND
2013-12-18A3L0672-11AND
2013-12-18A3L0672-05AND
2015-06-082625-007-0955ND
2015-06-082625-003-1138ND
2015-06-082625-022-1030ND
2015-07-082625-024-0955ND
2016-06-152625-010-0820ND
2016-06-152625-003-0800ND
2016-10-202625-020-1045ND
2017-06-142625-010-0930ND
2017-10-242625-020-1020ND