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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Los Angeles County WW District 4 & 34-Lancaster

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

 

139

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND160ND
2014ND430ND
2015ND240ND
2016ND230ND
2017ND30ND
2018ND40ND
2019ND260ND

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
2013-11-14201311150378AMND
2013-11-18201311210801AMND
2013-11-18201311210815AMND
2013-11-18201311200611AMND
2013-11-18201311200623AMND
2013-11-19201311250062AMND
2013-11-19201311250078AMND
2013-11-19201311220608AMND
2013-11-19201311220610AMND
2013-11-20201312020193AMND
2013-11-20201311270080AMND
2013-11-20201311270082AMND
2013-11-20201312020184AMND
2013-11-25201312040648AMND
2013-11-25201312030254AMND
2013-11-25201312030252AMND
2014-02-13201402140365AMND
2014-03-185442-011-0830ND
2014-04-095442-093-1000ND
2014-05-13201405160381AMND
2014-05-13201405160338AMND
2014-05-13201405160379AMND
2014-05-14201405190271AMND
2014-05-14201405220244AMND
2014-05-14201405160332AMND
2014-05-14201405190269AMND
2014-05-14201405160336AMND
2014-05-14201405160334AMND
2014-05-20201405220248AMND
2014-05-20201405230366AMND
2014-05-21201405230356AMND
2014-05-21201405230368AMND
2014-05-27201405290650AMND
2014-05-27201405290654AMND
2014-05-28201405290636AMND
2014-06-175442-069-0900ND
2014-06-175442-070-0912ND
2014-07-085442-048-0902ND
2014-07-085442-062-0856ND
2014-07-095442-041-0907ND
2014-07-095442-045-1024ND
2014-07-105442-071-1100ND
2014-07-105442-094-1000ND
2014-07-105442-095-1007ND
2014-07-175442-067-1026ND
2014-07-225442-002-1150ND
2014-07-225442-036-0904ND
2014-07-225442-040-0855ND
2014-07-225442-053-1120ND
2014-07-225442-054-1135ND
2014-07-225442-055-0947ND
2014-07-245442-063-1110ND
2014-08-07201408120547AMND
2014-08-195442-035-1015ND
2014-08-265442-037-0845ND
2014-09-095442-016-1100ND
2014-09-095442-023-1100ND
2014-09-305442-026-0855ND
2014-09-305442-028-0940ND
2015-03-045442-011-1020ND
2015-04-075442-093-0918ND
2015-04-145442-068-1110ND
2015-06-025442-069-1100ND
2015-06-025442-070-1010ND
2015-07-065442-028-1150ND
2015-07-065442-048-1115ND
2015-07-065442-062-1120ND
2015-07-075442-026-0850ND
2015-07-075442-041-0828ND
2015-07-075442-045-0938ND
2015-07-085442-067-0922ND
2015-07-085442-071-1100ND
2015-07-085442-095-1145ND
2015-07-135442-040-0850ND
2015-07-145442-053-0945ND
2015-07-145442-054-0930ND
2015-07-275442-055-1155ND
2015-08-125442-035-0925ND
2015-08-125442-036-0910ND
2015-08-185442-037-0930ND
2015-09-215442-016-0856ND
2015-09-215442-023-0905ND
2015-12-165442-094-1015ND
2016-01-195442-035-0950ND
2016-01-195442-040-0945ND
2016-01-255442-028-0840ND
2016-01-255442-048-0940ND
2016-01-255442-062-0930ND
2016-01-265442-093-1100ND
2016-02-095442-069-1010ND
2016-02-095442-070-1110ND
2016-02-105442-071-1125ND
2016-03-095442-023-1041ND
2016-03-285442-011-1138ND
2016-03-285442-055-1126ND
2016-03-285442-067-0856ND
2016-04-205442-026-1016ND
2016-04-205442-041-0934ND
2016-06-085442-036-0945ND
2016-06-275442-094-1125ND
2016-06-275442-095-1050ND
2016-06-285442-037-1132ND
2016-06-285442-053-1155ND
2016-06-285442-054-1152ND
2016-08-315442-016-1105ND
2016-12-155442-045-0911ND
2017-07-189588-063-0950ND
2017-11-219590-045-0935ND
2017-12-272920-068-0935ND
2018-02-289590-037-1000ND
2018-02-289590-053-1035ND
2018-02-289590-054-1030ND
2018-12-269590-063-1055ND
2019-01-079590-093-1706ND
2019-01-089590-023-1115ND
2019-01-089590-026-1025ND
2019-01-089590-045-1020ND
2019-02-069590-067-1100ND
2019-02-119590-070-1125ND
2019-02-119590-071-1120ND
2019-02-199590-011-1145ND
2019-02-269590-028-1150ND
2019-02-269590-048-1225ND
2019-02-269590-062-1210ND
2019-02-269590-063-1210ND
2019-03-139590-036-1035ND
2019-03-139590-094-0920ND
2019-03-139590-095-0925ND
2019-03-139590-095-0940ND
2019-03-199590-035-1120ND
2019-03-199590-040-1145ND
2019-03-199590-041-0930ND
2019-03-199590-053-1315ND
2019-03-199590-054-1300ND
2019-03-269590-069-0945ND
2019-06-199590-037-1000ND
2019-08-129590-055-1040ND
2019-08-199590-023-1020ND
2019-12-239590-095-0933ND