Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chloromethane

Rincon Del Diablo MWD(ID-1)

NOTE: Rincon Del Diablo MWD(ID-1) purchases water from San Diego County Water Authority which is required to test for chloromethane. Sample information shown below was taken by San Diego County Water Authority.

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND40ND
2014ND50ND
2015ND40ND
2016ND40ND
2017ND40ND

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: Rincon Del Diablo MWD(ID-1) purchases water from San Diego County Water Authority which is required to test for chloromethane. Sample information shown below was taken by San Diego County Water Authority.

Date Lab ID Result
2012-01-129590-003-1259ND
2012-04-129590-003-1313ND
2012-09-109590-003-1430ND
2012-10-029590-001-1320ND
2012-10-199590-003-1830ND
2012-11-069590-003-1255ND
2013-02-189590-003-1440ND
2013-04-119590-003-1155ND
2013-07-219590-003-1700ND
2013-09-119590-001-1145ND
2013-12-039590-003-1424ND
2014-02-059590-003-1102ND
2014-04-099590-003-1424ND
2014-07-249590-003-1229ND
2014-12-169590-003-1143ND
2014-12-299590-001-1010ND
2015-01-059590-003-1039ND
2015-04-089590-003-1429ND
2015-08-259590-003-1333ND
2015-10-209590-003-1202ND
2016-02-109590-003-1340ND
2016-06-169590-003-1435ND
2016-08-029590-003-1135ND
2016-11-299590-003-1309ND
2017-03-309590-003-1230ND
2017-06-149590-003-0942ND
2017-07-059590-003-1134ND
2017-10-169590-003-1305ND