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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Galveston County WCID 1

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND30ND
2014ND150ND
20150.967 ppb31ND - 2.90 ppb
2016ND50ND
20173.90 ppb43ND - 9.90 ppb

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
2013-02-05AC09710ND
2013-02-05AC09706ND
2013-02-05AC09708ND
2014-01-30Q1402958007ND
2014-01-30Q1402958003ND
2014-01-30Q1402958005ND
2014-01-30Q1402958009ND
2014-01-30Q1402958001ND
2014-04-23Q1412817001ND
2014-06-03AC55805ND
2014-06-03AC55811ND
2014-06-03AC55813ND
2014-07-30Q1432033003ND
2014-07-30Q1432033001ND
2014-07-30Q1432033005ND
2014-07-30Q1432033009ND
2014-07-30Q1432033007ND
2014-10-22Q1453353001ND
2015-01-15AC76462ND
2015-01-15AC76456ND
2015-01-15AC764662.90 ppb
2016-01-26AD20090ND
2016-01-26AD20084ND
2016-06-27AD41911ND
2016-09-29AD52074ND
2016-11-29AD59385ND
2017-01-26AD672012.10 ppb
2017-01-26AD671773.60 ppb
2017-01-26AD671859.90 ppb
2017-04-25AD81207ND