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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Pomona Water Department

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

 

110

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND150ND
2014ND260ND
2015ND200ND
2016ND100ND
2017ND100ND
2018ND170ND
2019ND120ND

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
2013-05-08201305080592AMND
2013-05-08201305080588AMND
2013-05-08201305080594AMND
2013-05-08201305080586AMND
2013-05-08201305080590AMND
2013-05-08201305080584AMND
2013-08-08201308080470AMND
2013-08-08201308080472AMND
2013-08-08201308080474AMND
2013-10-02201310020264AMND
2013-11-05201311050736AMND
2013-11-05201311050732AMND
2013-11-05201311050728AMND
2013-11-05201311050730AMND
2013-11-05201311050734AMND
2014-01-029590-031-1129ND
2014-01-029590-042-1105ND
2014-01-069590-033-1012ND
2014-01-069590-038-1046ND
2014-01-069590-069-1037ND
2014-01-089590-010-0912ND
2014-01-169590-025-0838ND
2014-01-169590-040-0902ND
2014-02-04201402040632AMND
2014-02-04201402040634AMND
2014-02-04201402040630AMND
2014-02-199590-051-1311ND
2014-03-189590-013-0955ND
2014-03-269590-036-0957ND
2014-04-099590-071-0935ND
2014-06-109590-028-0740ND
2014-07-029590-032-0813ND
2014-07-079590-033-0847ND
2014-07-079590-038-0945ND
2014-07-079590-042-1135ND
2014-07-169590-052-0856ND
2014-08-289590-027-0930ND
2014-09-16201409170324AMND
2014-10-069590-071-0918ND
2014-11-129590-051-1005ND
2014-12-099590-035-0943ND
2015-01-059590-033-1052ND
2015-01-059590-038-0946ND
2015-01-059590-042-1030ND
2015-01-059590-069-0943ND
2015-01-139590-010-0834ND
2015-01-139590-025-0930ND
2015-01-139590-040-0930ND
2015-02-269590-036-0922ND
2015-03-17201503170763AMND
2015-03-239590-031-1000ND
2015-04-069590-071-1131ND
2015-04-149590-013-0935ND
2015-06-109590-028-0844ND
2015-07-019590-052-1029ND
2015-07-069590-033-0910ND
2015-07-069590-038-0857ND
2015-07-069590-042-0959ND
2015-07-089590-032-0815ND
2015-09-299590-027-1145ND
2015-10-209590-035-1021ND
2016-01-049590-042-1250ND
2016-01-069590-025-0920ND
2016-01-069590-040-0830ND
2016-01-139590-010-1000ND
2016-04-049590-071-1009ND
2016-07-059590-038-0954ND
2016-07-059590-052-1111ND
2016-07-149590-033-1000ND
2016-07-149590-042-0845ND
2016-10-129590-071-0942ND
2017-01-039590-033-0933ND
2017-01-039590-038-0835ND
2017-01-179590-010-1205ND
2017-01-189590-025-1218ND
2017-01-189590-040-1133ND
2017-01-259590-051-0910ND
2017-03-099590-042-1005ND
2017-04-069590-071-1145ND
2017-05-179590-036-1045ND
2017-07-259590-052-1445ND
2018-01-039590-033-1405ND
2018-01-039590-038-1006ND
2018-01-189590-042-1313ND
2018-01-229590-010-1207ND
2018-01-229590-025-1257ND
2018-01-229590-040-1325ND
2018-01-239590-069-1404ND
2018-04-169590-071-0956ND
2018-05-239590-028-1006ND
2018-06-139590-063-0955ND
2018-07-119590-033-1309ND
2018-07-169590-038-1333ND
2018-07-179590-042-1055ND
2018-07-189590-027-1408ND
2018-07-199590-031-0951ND
2018-10-239590-071-0935ND
2018-12-069590-063-0820ND
2019-01-039590-010-0939ND
2019-01-239590-010-1045ND
2019-01-239590-038-0843ND
2019-01-249590-025-1116ND
2019-01-249590-040-1155ND
2019-04-049590-071-0901ND
2019-07-029590-042-1220ND
2019-07-189590-027-1156ND
2019-07-189590-031-1035ND
2019-07-189590-052-1330ND
2019-10-039590-063-1340ND
2019-10-109590-071-1316ND