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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Water District 1 of Johnson County

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND100ND
2014ND80ND
2015N/A00N/A
2016ND30ND
2017ND30ND

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
2012-05-22MAY2012-VOC-TP2ND
2012-05-22MAY2012-VOC-TP3ND
2012-05-30MAY2012-VOC-TP1ND
2013-05-01MAY2013-OC-TP3ND
2013-05-01MAY2013-OC-TP2ND
2013-05-01MAY2013-OC-TP1ND
2013-07-08JUL2013-OC-TP1ND
2013-07-29201307300096AMND
2013-07-29201307300094AMND
2013-07-29201307300098AMND
2013-10-21201310220203AMND
2013-10-21201310220205AMND
2013-10-21201310220207AMND
2014-01-13201401140255AMND
2014-01-13201401140253AMND
2014-04-08201404090433AMND
2014-04-08201404090431AMND
2014-05-07MAY2014-OC-TP3ND
2014-05-07MAY2014-OC-TP1ND
2014-05-07MAY2014-OC-TP2ND
2014-05-21201405220480AMND
2016-05-17MAY2016--TP3ND
2016-05-17MAY2016--TP2ND
2016-06-20JUN2016--TP1ND
2017-05-16MAY2017--TP3ND
2017-05-16MAY2017--TP2ND
2017-07-12JUL2017--TP1 524ND