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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Chino

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

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND170ND
2016N/A00N/A
2017N/A00N/A
2018ND40ND
2019N/A00N/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
2014-03-259590-019-0830ND
2014-10-30201410300287AMND
2014-10-30201410300311AMND
2014-10-30201410300300AMND
2014-10-30201410300379AMND
2014-10-30201410300281AMND
2014-10-30201410300377AMND
2014-10-30201410300302AMND
2015-01-29201501290343AMND
2015-01-29201501290336AMND
2015-04-29201504290657AMND
2015-04-29201504290430AMND
2015-04-29201504290435AMND
2015-04-29201504290495AMND
2015-04-29201504290662AMND
2015-04-29201504290666AMND
2015-04-29201504290625AMND
2015-07-23201507230361AMND
2015-07-23201507230333AMND
2015-08-259590-004-0720ND
2015-08-259590-019-1100ND
2015-08-259590-012-0900ND
2015-08-259590-011-0930ND
2015-08-259590-010-0740ND
2015-08-259590-009-0900ND
2018-07-179588-012-0815ND
2018-07-179588-008-0920ND
2018-07-319588-019-0705ND
2018-11-279588-004-0840ND