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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Golden State Water Company (GSWC) - Southwest

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20131.02 ppb236ND - 11.0 ppb
2014ND10ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
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
2013-06-10201306100486AMND
2013-06-10201306100488AM0.350 ppb
2013-06-10201306100490AM1.80 ppb
2013-06-10201306100484AMND
2013-06-10201306100478AMND
2013-06-17201306180026AMND
2013-06-17201306180020AM8.00 ppb
2013-06-17201306180024AMND
2013-06-17201306180014AMND
2013-06-17201306180030AMND
2013-06-17201306180028AMND
2013-09-18201309190354AMND
2013-12-09201312100166AMND
2013-12-10201312110534AMND
2013-12-10201312110518AMND
2013-12-11201312120511AM0.330 ppb
2013-12-11201312120537AMND
2013-12-11201312120539AM2.00 ppb
2013-12-16201312160220AMND
2013-12-16201312160216AM11.0 ppb
2013-12-17201312170716AMND
2013-12-17201312170714AMND
2013-12-18201312180743AMND
2014-03-10201403100301AMND