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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Madera

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

 

83

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND470ND
2015ND60ND
2016ND80ND
2017ND150ND
2018ND20ND
2019ND50ND

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
2014-02-285810-021-0825ND
2014-02-285810-019-0842ND
2014-02-285810-024-1018ND
2014-02-285810-025-1128ND
2014-02-285810-031-0931ND
2014-03-20A4C0742-35AND
2014-03-20A4C0742-25AND
2014-03-20A4C0742-27AND
2014-03-20A4C0742-21AND
2014-03-20A4C0742-23AND
2014-03-20A4C0742-33AND
2014-03-20A4C0742-29AND
2014-03-20A4C0742-31AND
2014-03-20A4C0742-05AND
2014-03-20A4C0742-07AND
2014-03-20A4C0742-15AND
2014-03-20A4C0742-11AND
2014-03-20A4C0742-09AND
2014-03-20A4C0742-19AND
2014-03-20A4C0742-17AND
2014-03-20A4C0742-03AND
2014-03-20A4C0742-01AND
2014-05-295810-020-1112ND
2014-05-295810-021-1301ND
2014-05-295810-018-0919ND
2014-05-295810-023-1211ND
2014-05-295810-016-0903ND
2014-05-295810-013-1236ND
2014-05-295810-011-0837ND
2014-09-25A4I0631-25AND
2014-09-25A4I0631-10AND
2014-09-25A4I0631-16AND
2014-09-25A4I0631-22AND
2014-09-25A4I0631-07AND
2014-09-25A4I0631-01AND
2014-09-25A4I0631-31AND
2014-09-25A4I0631-13AND
2014-09-25A4I0631-37AND
2014-09-25A4I0631-34AND
2014-09-25A4I0631-43AND
2014-09-25A4I0631-04AND
2014-09-25A4I0631-28AND
2014-09-25A4I0631-46AND
2014-09-25A4I0631-40AND
2014-09-25A4I0631-19AND
2014-11-205810-017-0934ND
2014-11-205810-019-0852ND
2015-02-195810-019-0856ND
2015-02-195810-025-1014ND
2015-02-195810-032-0925ND
2015-02-195810-030-1118ND
2015-05-215810-033-0817ND
2015-11-195810-032-0922ND
2016-02-185810-024-1130ND
2016-02-185810-019-0922ND
2016-02-185810-023-0937ND
2016-02-185810-025-0903ND
2016-02-185810-030-1048ND
2016-02-185810-033-0850ND
2016-05-315810-001-1042ND
2016-08-255810-014-0957ND
2017-02-169590-023-0832ND
2017-02-169590-030-1057ND
2017-02-169590-032-1035ND
2017-02-169590-031-1008ND
2017-02-169590-025-0949ND
2017-05-259590-011-1425ND
2017-05-259590-013-1403ND
2017-05-259590-023-1316ND
2017-05-259590-021-1150ND
2017-05-259590-020-1100ND
2017-05-259590-014-1347ND
2017-05-259590-018-1129ND
2017-11-169590-019-0941ND
2017-11-169590-017-1005ND
2017-11-169590-018-1053ND
2018-05-245810-033-1010ND
2018-12-065810-032-1405ND
2019-02-225810-016-1310ND
2019-02-225810-024-1200ND
2019-02-225810-030-1115ND
2019-06-145810-001-1133ND
2019-12-065810-050-1330ND