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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

CTWC - Naugatuck Region-Central System

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

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND70ND
2014ND60ND
2015ND40ND
20160.425 ppb41ND - 1.70 ppb
2017ND30ND
2018ND40ND
2019ND10ND

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
2013-05-29201305300192AMND
2013-05-29201305300148AMND
2013-05-29201305300168AMND
2013-08-13201308140348AMND
2013-11-18201311190238AMND
2013-11-18201311190229AMND
2013-11-19201311200412AMND
2014-02-11201402120585AMND
2014-03-04BG14936VOC1ND
2014-03-06BG16206VOC1ND
2014-03-06BG16207VOC1ND
2014-04-29BG38084VOC1ND
2014-07-28BG82699VOC1ND
2015-02-17BH74013VOC1ND
2015-03-16BH83835VOC1ND
2015-03-16BH83838VOC1ND
2015-11-11BK21527VOC1ND
2016-01-19BK54678VOC1ND
2016-03-09BK76130VOC11.70 ppb
2016-04-12BN12472VOC1ND
2016-11-14BV85888VOC1ND
2017-01-11BX19357VOC1ND
2017-01-17BX30447VOC1ND
2017-05-23BY28091VOC1ND
2018-01-15BZ72858VOC1ND
2018-02-13BZ88506VOC1ND
2018-05-21CA50441VOC1ND
2018-06-11CA67845VOC1ND
2019-02-12VOC1 200521378ND