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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

St. Louis City

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
20130.0590 ppb101ND - 0.590 ppb
2014ND20ND
2015ND20ND
2016ND30ND
2017N/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
2012-06-28CRCW062812M524ND
2012-06-28HBCB062812M524ND
2013-01-223580787001AMND
2013-01-223580790001AMND
2013-04-293591472001AMND
2013-04-293591472003AMND
2013-07-1535100737001AMND
2013-07-1535100737003AMND
2013-10-1635112733003AMND
2013-10-1635112733001AMND
2013-10-22CRCW102213M524ND
2013-10-22HBCB102213M5240.590 ppb
2014-05-28AC26114ND
2014-05-28AC26115ND
2015-06-01AC47391ND
2015-06-01AC47390ND
2016-06-06AC75866ND
2016-06-06AC77510ND
2016-06-06AC75867ND