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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Davis

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

 

94

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0524 ppb421ND - 2.20 ppb
2015ND170ND
2016ND30ND
2017ND120ND
2018ND110ND
2019ND90ND

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
2014-01-06A3L2010-09AND
2014-01-06A3L2010-21AND
2014-01-06A3L2010-25AND
2014-01-06A3L2010-01AND
2014-01-06A3L2010-17AND
2014-01-06A3L2010-05AND
2014-01-06A3L2010-29A2.20 ppb
2014-01-06A3L2010-41AND
2014-01-06A3L2010-37AND
2014-01-06A3L2010-33AND
2014-01-07A3L2010-13AND
2014-04-08A4C2096-01AND
2014-08-055810-019-0737ND
2014-08-055810-016-0853ND
2014-08-055810-020-0657ND
2014-08-055810-023-0720ND
2014-08-055810-052-0935ND
2014-08-055810-030-1059ND
2014-08-055810-026-1014ND
2014-08-055810-025-1000ND
2014-08-055810-024-1025ND
2014-08-055810-018-0753ND
2014-08-055810-017-0909ND
2014-08-055810-015-1036ND
2014-08-055810-014-0950ND
2014-08-055810-010-0918ND
2014-08-055810-009-1120ND
2014-08-055810-006-0837ND
2014-08-055810-004-0810ND
2014-08-055810-002-0822ND
2014-08-13A4F2264-01AND
2014-08-13A4F2265-51AND
2014-08-13A4F2265-31AND
2014-08-13A4F2265-26AND
2014-08-13A4F2265-41AND
2014-08-13A4F2265-46AND
2014-08-13A4F2265-36AND
2014-08-13A4F2265-06AND
2014-08-13A4F2265-01AND
2014-08-13A4F2265-11AND
2014-08-13A4F2265-21AND
2014-08-13A4F2265-16AND
2015-01-13A4L0813-01AND
2015-07-075810-004-1253ND
2015-07-075810-018-0721ND
2015-07-075810-024-1120ND
2015-07-075810-030-0919ND
2015-07-075810-023-0904ND
2015-07-075810-020-0757ND
2015-07-075810-052-0648ND
2015-07-075810-025-0832ND
2015-07-075810-017-1030ND
2015-07-075810-016-0957ND
2015-07-075810-015-1321ND
2015-07-075810-010-1148ND
2015-07-075810-006-1115ND
2015-07-075810-002-1333ND
2015-07-075810-026-1041ND
2015-07-215810-009-0747ND
2016-01-265810-019-1005ND
2016-07-135810-030-0844ND
2016-07-205810-052-0843ND
2017-03-205810-057-1120ND
2017-06-145810-057-0820ND
2017-08-025810-052-1115ND
2017-08-035810-030-0625ND
2017-08-315810-026-0935ND
2017-08-315810-006-0858ND
2017-08-315810-025-0918ND
2017-08-315810-018-0838ND
2017-08-315810-019-0822ND
2017-08-315810-020-0807ND
2017-09-205810-057-0910ND
2017-12-125810-057-0735ND
2018-02-145810-057-0925ND
2018-04-185810-028-0855ND
2018-08-155810-030-0640ND
2018-08-155810-028-0720ND
2018-08-155810-025-0755ND
2018-08-155810-057-0840ND
2018-08-155810-052-0930ND
2018-08-155810-018-0819ND
2018-08-155810-019-0902ND
2018-08-155810-020-1001ND
2018-11-075810-028-0818ND
2019-02-065810-028-0820ND
2019-08-079590-030-1008ND
2019-08-079590-028-1033ND
2019-08-079590-052-1134ND
2019-08-079590-057-1200ND
2019-08-079590-025-1102ND
2019-08-089590-018-1010ND
2019-08-089590-020-1103ND
2019-08-089590-019-1033ND