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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Dublin San Ramon Services District

NOTE: Dublin San Ramon Services District purchases water from Zone 7 Water Agency which is required to test for chloromethane. Sample information shown below was taken by Zone 7 Water Agency.

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

 

59

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND30ND
2014ND10ND
2015ND90ND
2016ND80ND
2017ND90ND
2018ND150ND
2019N/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

NOTE: Dublin San Ramon Services District purchases water from Zone 7 Water Agency which is required to test for chloromethane. Sample information shown below was taken by Zone 7 Water Agency.

Date Lab ID Result
2014-03-245100-001-1000ND
2014-03-245100-008-1045ND
2014-06-095100-001-1000ND
2014-06-105100-011-1040ND
2014-06-105100-005-1000ND
2014-06-115100-013-0930ND
2014-06-115100-006-0825ND
2014-06-165100-007-0910ND
2014-06-175100-012-1125ND
2014-06-195100-019-0935ND
2014-09-085100-006-1150ND
2014-09-085100-001-0840ND
2014-09-085100-008-1043ND
2014-09-095100-007-0930ND
2014-09-105100-005-0830ND
2014-09-105100-011-0800ND
2014-12-085100-001-0905ND
2014-12-085100-008-1045ND
2015-06-225100-008-0845ND
2015-06-225100-001-1100ND
2015-06-245100-019-0845ND
2015-06-255100-017-0955ND
2015-06-265100-005-0905ND
2015-06-265100-007-0930ND
2015-09-085100-001-0930ND
2015-09-085100-008-1030ND
2015-09-105100-017-0910ND
2016-07-115100-001-0920ND
2016-07-115100-007-1220ND
2016-07-115100-008-1010ND
2016-07-135100-017-1035ND
2016-07-135100-019-0920ND
2016-10-105100-001-0915ND
2016-10-105100-008-0930ND
2016-10-135100-012-1400ND
2017-04-105100-001-0910ND
2017-04-125100-017-1110ND
2017-07-105100-019-1135ND
2017-07-105100-007-1010ND
2017-07-115100-008-0955ND
2017-07-115100-017-1210ND
2017-07-115100-001-0935ND
2017-07-125100-012-0900ND
2017-07-135100-013-0915ND
2018-04-095100-008-1020ND
2018-04-095100-017-1035ND
2018-04-095100-001-1137ND
2018-04-105100-011-1215ND
2018-04-105100-005-1240ND
2018-04-105100-019-0925ND
2018-04-115100-006-1110ND
2018-04-115100-013-0940ND
2018-04-115100-012-1040ND
2018-10-085100-012-1200ND
2018-10-085100-001-0825ND
2018-10-085100-008-0955ND
2018-10-085100-019-1140ND
2018-10-095100-017-0900ND
2018-10-105100-007-1435ND