Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloromethane

Connecticut Water Company - Baker Hill Division

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

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.128 ppb41ND - 0.510 ppb
20150.325 ppb41ND - 1.30 ppb
2016ND50ND
2017ND40ND
2018ND50ND
2019ND60ND

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
2014-02-18BG09924VOC1ND
2014-05-27BG48829VOC1ND
2014-09-17BH14927VOC10.510 ppb
2014-10-17BH28943VOC1ND
2015-03-06BH80128VOC1ND
2015-06-26BJ37940VOC1ND
2015-09-25BJ98071VOC11.30 ppb
2015-10-05BK02585VOC1ND
2016-03-25BK89376VOC1ND
2016-06-24BN62378VOC1ND
2016-06-24BN62379VOC1ND
2016-08-22BN96087VOC1ND
2016-12-08BX01528VOC1ND
2017-02-27BX76017VOC1ND
2017-06-06BY33438VOC1ND
2017-08-23BY89280VOC1ND
2017-12-11BZ54749VOC1ND
2018-03-05BZ97690VOC1ND
2018-06-13CA69476VOC1ND
2018-09-26VOC1 200506968ND
2018-09-26VOC1 200506933ND
2018-11-14VOC1 200512695ND
2019-01-14VOC1 200518574ND
2019-01-24VOC1 200519630ND
2019-01-24VOC1 200519631ND
2019-04-15VOC1 200528386ND
2019-09-18VOC1 200549429ND
2019-10-07VOC1 200551662ND