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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

West Sound Utility District #1

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

 

42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0356 ppb91ND - 0.320 ppb
20150.0320 ppb101ND - 0.320 ppb
2016N/A00N/A
2017ND200ND
2018ND30ND
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
2014-09-22201409240534AMND
2014-09-22201409240418AMND
2014-09-22201409240416AMND
2014-09-22201409240412AMND
2014-09-23201409250525AMND
2014-09-23201409250515AMND
2014-09-23201409250596AM0.320 ppb
2014-09-23201409250638AMND
2014-09-24201409260328AMND
2015-03-16201503180707AMND
2015-03-16201503180809AMND
2015-03-16201503180471AMND
2015-03-16201503180807AMND
2015-03-17201503190512AM0.320 ppb
2015-03-17201503190483AMND
2015-03-17201503190566AMND
2015-03-18201503200254AMND
2015-03-18201503200243AMND
2015-04-1501027ND
2017-04-11ND
2017-04-11ND
2017-04-11ND
2017-04-11ND
2017-04-11ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-05-25ND
2017-06-29ND
2017-06-29ND
2017-06-29ND
2017-08-04ND
2017-08-04ND
2017-08-25ND
2017-09-07ND
2017-09-07ND
2017-11-22ND
2018-02-23ND
2018-07-06ND
2018-10-09ND