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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Oak Park Water Service

NOTE: Oak Park Water Service purchases water from Calleguas Municipal Water District which is required to test for chloromethane. Sample information shown below was taken by Calleguas 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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND80ND
2014ND70ND
2015ND40ND
2016ND80ND
2017ND80ND

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: Oak Park Water Service purchases water from Calleguas Municipal Water District which is required to test for chloromethane. Sample information shown below was taken by Calleguas Municipal Water District.

Date Lab ID Result
2012-02-085867-004-1255ND
2012-02-215867-013-1445ND
2012-02-215867-017-1600ND
2012-03-125867-014-1100ND
2012-03-125867-012-1445ND
2012-05-115867-016-1400ND
2013-03-085867-019-0930ND
2013-03-155867-022-1030ND
2013-03-225867-021-1100ND
2013-03-225867-023-1045ND
2013-04-235867-020-1345ND
2013-04-235867-018-1230ND
2013-04-265867-022-1130ND
2013-07-125867-015-1030ND
2014-01-105867-010-1130ND
2014-01-105867-006-0945ND
2014-03-215867-007-1125ND
2014-04-115867-009-1010ND
2014-04-185867-011-1030ND
2014-05-075867-004-0915ND
2014-11-185867-008-1315ND
2015-02-025867-004-0815ND
2015-02-195867-017-1415ND
2015-02-265867-004-1045ND
2015-10-215867-014-1020ND
2015-10-275867-012-1030ND
2015-10-275867-016-1130ND
2015-10-275867-015-1300ND
2015-11-045867-004-1340ND
2015-11-055867-013-1140ND
2016-04-045867-004-0840ND
2016-04-055867-022-0930ND
2016-04-055867-023-1000ND
2016-04-065867-018-1100ND
2016-04-065867-019-1030ND
2016-04-065867-020-1305ND
2016-04-065867-021-1150ND
2016-11-075867-004-0745ND
2017-03-215867-004-1040ND
2017-04-175867-009-1245ND
2017-04-175867-008-1005ND
2017-04-185867-006-1130ND
2017-04-195867-011-1050ND
2017-10-165867-004-0855ND
2017-11-065867-010-1120ND
2017-11-065867-007-1015ND