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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Norwalk Water Department

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

 

85

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.0667 ppb183ND - 0.500 ppb
2014ND120ND
20150.0775 ppb121ND - 0.930 ppb
2016ND120ND
2017ND120ND
2018ND80ND
2019ND110ND

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
2013-01-31440-36867-5ND
2013-01-31440-36867-7ND
2013-01-31440-36867-3ND
2013-01-31440-36867-1ND
2013-04-04440-42854-1ND
2013-04-04440-42854-3ND
2013-04-30440-45114-1ND
2013-04-30440-45114-5ND
2013-04-30440-45114-3ND
2013-07-292869312ND
2013-07-292869366ND
2013-07-2928693570.400 ppb
2013-07-292869301ND
2013-07-2928693480.300 ppb
2013-07-292869329ND
2013-10-292922268ND
2013-10-2929222880.500 ppb
2013-10-292922277ND
2014-02-199588-012-0930ND
2014-02-199588-002-1030ND
2014-02-199588-003-1000ND
2014-04-299588-012-0950ND
2014-04-299588-002-1029ND
2014-04-299588-003-1018ND
2014-07-239588-012-0945ND
2014-07-239588-003-1010ND
2014-07-239588-002-1025ND
2014-12-109588-012-0924ND
2014-12-109588-003-0945ND
2014-12-109588-002-1020ND
2015-03-259588-012-0926ND
2015-03-259588-003-0940ND
2015-03-259588-002-0953ND
2015-04-239588-012-0947ND
2015-04-239588-002-1041ND
2015-04-239588-003-1024ND
2015-07-309588-002-1044ND
2015-07-309588-003-1015ND
2015-07-309588-012-0928ND
2015-10-289588-002-10000.930 ppb
2015-10-289588-003-0945ND
2015-10-289588-012-0915ND
2016-03-249588-012-0940ND
2016-03-249588-003-1010ND
2016-03-249588-002-1024ND
2016-06-099588-012-0909ND
2016-06-099588-002-0945ND
2016-06-099588-003-0923ND
2016-07-209588-012-0915ND
2016-07-209588-002-1015ND
2016-07-209588-003-0945ND
2016-10-129588-003-0928ND
2016-10-129588-002-0957ND
2016-10-129588-012-0914ND
2017-01-189588-002-0935ND
2017-01-189588-012-0900ND
2017-01-189588-003-0920ND
2017-04-179588-002-0930ND
2017-04-179588-012-0910ND
2017-04-179588-003-0952ND
2017-07-249588-002-1028ND
2017-07-249588-012-0923ND
2017-07-249588-003-0955ND
2017-10-189588-012-0914ND
2017-10-189588-003-0940ND
2017-10-189588-002-0950ND
2018-01-249588-003-0920ND
2018-01-249588-002-0940ND
2018-04-119588-003-0930ND
2018-04-119588-002-0953ND
2018-07-259588-003-0935ND
2018-07-259588-002-1000ND
2018-10-269588-003-0920ND
2018-10-269588-002-0940ND
2019-01-239588-002-0950ND
2019-01-239588-003-0920ND
2019-04-259588-003-1005ND
2019-04-259588-002-1030ND
2019-05-249588-012-0920ND
2019-07-259588-012-0930ND
2019-07-259588-002-1035ND
2019-07-259588-003-1010ND
2019-10-259588-002-1000ND
2019-10-259588-003-1040ND
2019-10-259588-012-0930ND