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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

City of Rockport

NOTE: City of Rockport purchases water from San Patricio Municipal Water District which is required to test for chloromethane. Sample information shown below was taken by San Patricio Municipal Water District.

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
2014ND30ND
2015ND10ND
2016ND10ND
2017ND10ND

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

NOTE: City of Rockport purchases water from San Patricio Municipal Water District which is required to test for chloromethane. Sample information shown below was taken by San Patricio Municipal Water District.

Date Lab ID Result
2012-07-181207674001ND
2013-09-11AC29908ND
2014-09-16AC67104ND
2015-09-10AD06600ND
2016-07-20AD45239ND
2017-09-13AD96017ND