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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Sacramento County Water Authority - Laguna/Vineyard

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

 

103

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.105 ppb182ND - 1.000 ppb
20140.0250 ppb482ND - 0.800 ppb
2015ND40ND
2016ND20ND
20170.111 ppb275ND - 0.730 ppb
2018ND20ND
2019ND20ND

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
2013-10-16A3J0785-69AND
2013-10-16A3J0785-45AND
2013-10-16A3J0785-49AND
2013-10-16A3J0785-37AND
2013-10-16A3J0785-41A1.000 ppb
2013-10-16A3J0785-61AND
2013-10-16A3J0785-65AND
2013-10-16A3J0785-53AND
2013-10-16A3J0785-09AND
2013-10-16A3J0785-13AND
2013-10-16A3J0785-29AND
2013-10-16A3J0785-33AND
2013-10-16A3J0785-17AND
2013-10-16A3J0785-21AND
2013-10-16A3J0785-25AND
2013-10-17A3J0785-57A0.890 ppb
2013-10-17A3J0785-01AND
2013-10-17A3J0785-05AND
2014-03-26A4C1008-01AND
2014-04-15A4D0298-81AND
2014-04-15A4D0298-51AND
2014-04-15A4D0298-41AND
2014-04-15A4D0298-36AND
2014-04-15A4D0298-46A0.800 ppb
2014-04-15A4D0298-71AND
2014-04-15A4D0298-76A0.400 ppb
2014-04-15A4D0298-61AND
2014-04-15A4D0298-56AND
2014-04-15A4D0298-66AND
2014-04-15A4D0298-11AND
2014-04-15A4D0298-16AND
2014-04-15A4D0298-01AND
2014-04-15A4D0298-06AND
2014-04-15A4D0298-26AND
2014-04-15A4D0298-31AND
2014-04-15A4D0298-21AND
2014-04-16A4C2254-01AND
2014-05-225810-018-1326ND
2014-05-225810-038-1036ND
2014-07-09A4F1957-01AND
2014-07-295810-024-0840ND
2014-07-295810-028-0925ND
2014-08-195810-002-1017ND
2014-08-195810-003-1044ND
2014-08-195810-004-1110ND
2014-08-195810-008-1146ND
2014-08-195810-013-1243ND
2014-08-195810-029-1310ND
2014-08-195810-031-0945ND
2014-08-195810-049-0855ND
2014-08-195810-050-0916ND
2014-08-205810-019-1445ND
2014-08-205810-020-1345ND
2014-08-205810-021-1410ND
2014-08-205810-023-1326ND
2014-08-205810-025-0821ND
2014-08-205810-026-1248ND
2014-08-205810-030-1138ND
2014-08-205810-048-1200ND
2014-08-205810-051-1114ND
2014-08-215810-016-0843ND
2014-08-215810-017-0903ND
2014-08-215810-022-0937ND
2014-08-215810-034-0823ND
2014-08-215810-040-0803ND
2014-08-215810-041-0741ND
2015-05-135810-015-1031ND
2015-05-135810-018-1058ND
2015-06-035810-018-0729ND
2015-08-275810-038-1437ND
2016-02-295810-027-0931ND
2016-08-115810-038-1521ND
2017-08-015810-003-1430ND
2017-08-015810-008-1444ND
2017-08-015810-024-1329ND
2017-08-015810-028-13500.500 ppb
2017-08-025810-002-1311ND
2017-08-025810-004-1410ND
2017-08-025810-013-1257ND
2017-08-025810-025-1340ND
2017-08-025810-026-1012ND
2017-08-025810-029-12440.600 ppb
2017-08-025810-030-0934ND
2017-08-025810-031-08480.730 ppb
2017-08-025810-048-09460.540 ppb
2017-08-025810-049-0823ND
2017-08-025810-050-08390.630 ppb
2017-08-025810-051-0926ND
2017-08-105810-034-1310ND
2017-08-165810-016-1208ND
2017-08-165810-017-1256ND
2017-08-165810-020-1110ND
2017-08-165810-022-0856ND
2017-08-165810-040-1036ND
2017-08-235810-019-1053ND
2017-08-235810-021-0808ND
2017-08-235810-023-0844ND
2017-08-235810-041-0909ND
2017-09-285810-048-0810ND
2018-05-235810-015-1307ND
2018-05-235810-018-1318ND
2019-02-055810-027-1000ND
2019-08-065810-038-1300ND