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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Cliffdale West

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

 

53

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.00547 ppb531ND - 0.290 ppb
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
2014-03-10201403110323AMND
2014-03-10201403110485AMND
2014-03-10201403110492AMND
2014-03-10201403110248AMND
2014-03-11201403120601AMND
2014-03-11201403120770AMND
2014-03-11201403121138AMND
2014-03-11201403120774AMND
2014-03-12201403130412AMND
2014-03-12201403130414AMND
2014-03-12201403130416AMND
2014-03-13201403130209AMND
2014-03-13201403140275AMND
2014-03-13201403140170AMND
2014-03-13201403140164AMND
2014-03-17201403180227AMND
2014-03-17201403180201AMND
2014-03-17201403180203AMND
2014-03-18201403190659AMND
2014-03-18201403190705AMND
2014-03-19201403200581AMND
2014-03-31201404010147AM0.290 ppb
2014-04-08201404090755AMND
2014-04-08201404090616AMND
2014-04-30201405020271AMND
2014-04-30201405020269AMND
2014-09-09201409100871AMND
2014-09-09201409110337AMND
2014-09-09201409110315AMND
2014-09-09201409100791AMND
2014-09-09201409100817AMND
2014-09-09201409100869AMND
2014-09-09201409100887AMND
2014-09-09201409101002AMND
2014-09-10201409110590AMND
2014-09-10201409110661AMND
2014-09-10201409110637AMND
2014-09-10201409110794AMND
2014-09-10201409110838AMND
2014-09-10201409110653AMND
2014-09-10201409110899AMND
2014-09-11201409120582AMND
2014-09-11201409120590AMND
2014-09-11201409120829AMND
2014-09-15201409180321AMND
2014-09-16201409170728AMND
2014-09-17201409190313AMND
2014-09-17201409190284AMND
2014-09-17201409190242AMND
2014-09-17201409180633AMND
2014-09-18201409190445AMND
2014-09-18201409190466AMND
2014-09-29201409300388AMND