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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

City of Baltimore

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND30ND
2014ND30ND
20150.388 ppb125ND - 1.60 ppb
2016N/A00N/A
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
2012-04-300300002_01_TREATND
2012-04-300300002_02_TREATND
2013-01-250300002_01_TREATND
2013-01-250300002_02_TREATND
2013-01-250300002_02_TREATND
2014-02-040300002_01_TREATND
2014-02-110300002_02_TREATND
2014-02-120300002_02_TREATND
2015-02-022052649001ND
2015-02-022052650001ND
2015-02-022052646001ND
2015-04-2320672770110.260 ppb
2015-04-232067277001ND
2015-04-2320672770060.200 ppb
2015-07-2220850750011.30 ppb
2015-07-2220850750041.30 ppb
2015-07-2220850750091.60 ppb
2015-10-272104524004ND
2015-10-272104527001ND
2015-10-272104524001ND