Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloromethane

Rancho California Water District

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

 

182

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND480ND
2015ND570ND
2016ND110ND
2017ND230ND
2018ND300ND
2019ND130ND

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
2014-03-114790-028-0922ND
2014-03-114790-046-0815ND
2014-04-024790-085-1030ND
2014-04-024790-086-1100ND
2014-04-034790-043-1015ND
2014-04-034790-084-0915ND
2014-05-084790-048-0930ND
2014-05-234790-143-0840ND
2014-06-034790-051-1140ND
2014-08-064790-143-0905ND
2014-08-074790-095-0905ND
2014-09-044790-059-0935ND
2014-10-024790-029-0940ND
2014-10-06B4J0481-01ND
2014-10-07B4J0640-01ND
2014-10-07B4J0640-13ND
2014-10-07B4J0640-04ND
2014-10-07B4J0640-10ND
2014-10-07B4J0640-07ND
2014-10-08B4J0845-13ND
2014-10-08B4J0845-01ND
2014-10-08B4J0845-04ND
2014-10-08B4J0845-16ND
2014-10-08B4J0845-07ND
2014-10-08B4J0845-10ND
2014-10-08B4J0845-19ND
2014-10-09B4J1091-11ND
2014-10-09B4J1091-14ND
2014-10-09B4J1091-05ND
2014-10-09B4J1091-08ND
2014-10-13B4J1329-16ND
2014-10-13B4J1329-07ND
2014-10-13B4J1329-25ND
2014-10-13B4J1329-10ND
2014-10-13B4J1329-01ND
2014-10-13B4J1329-19ND
2014-10-13B4J1329-04ND
2014-10-13B4J1329-13ND
2014-10-13B4J1329-22ND
2014-10-14B4J1493-13ND
2014-10-14B4J1493-07ND
2014-10-14B4J1493-10ND
2014-10-14B4J1493-01ND
2014-10-14B4J1493-04ND
2014-10-15B4J1671-01ND
2014-11-04B4K0339-01ND
2014-11-124790-143-1045ND
2014-11-14B4K1419-01ND
2015-01-074790-097-1215ND
2015-01-15B5A1539-01ND
2015-01-294790-142-1030ND
2015-02-03B5B0305-01ND
2015-02-054790-036-1125ND
2015-02-064790-042-1100ND
2015-03-30B5C2852-04ND
2015-03-30B5C2852-01ND
2015-04-02B5D0198-01ND
2015-04-02B5D0198-04ND
2015-04-13B5D1204-01ND
2015-04-13B5D1204-16ND
2015-04-13B5D1204-04ND
2015-04-13B5D1204-07ND
2015-04-13B5D1204-10ND
2015-04-13B5D1204-22ND
2015-04-13B5D1204-19ND
2015-04-13B5D1204-13ND
2015-04-14B5D1346-01ND
2015-04-14B5D1346-04ND
2015-04-15B5D1533-16ND
2015-04-15B5D1533-31ND
2015-04-15B5D1533-34ND
2015-04-15B5D1533-04ND
2015-04-15B5D1533-07ND
2015-04-15B5D1533-22ND
2015-04-15B5D1533-25ND
2015-04-15B5D1533-28ND
2015-04-15B5D1533-13ND
2015-04-15B5D1533-01ND
2015-04-15B5D1533-10ND
2015-04-15B5D1533-19ND
2015-04-164790-058-1045ND
2015-04-224790-053-1200ND
2015-04-224790-142-1015ND
2015-04-29B5D2887-04ND
2015-04-29B5D2887-01ND
2015-05-064790-143-1050ND
2015-05-144790-015-1025ND
2015-06-024790-018-1030ND
2015-07-014790-031-1031ND
2015-07-024790-040-1130ND
2015-07-144790-142-1000ND
2015-07-21B5G2279-01ND
2015-07-21B5G2279-04ND
2015-07-274790-037-1032ND
2015-08-054790-143-1455ND
2015-08-064790-017-1245ND
2015-08-064790-019-1210ND
2015-08-064790-025-1140ND
2015-08-064790-038-0945ND
2015-08-074790-027-0840ND
2015-08-074790-035-0930ND
2015-08-20B5H2092-04ND
2015-08-20B5H2092-01ND
2015-10-144790-142-1045ND
2015-10-224790-044-0830ND
2016-01-204790-142-1030ND
2016-02-294790-150-1830ND
2016-04-144790-142-1100ND
2016-04-224790-047-0840ND
2016-04-224790-071-1030ND
2016-07-254790-012-1230ND
2016-07-274790-142-1130ND
2016-08-034790-034-1145ND
2016-08-034790-041-0955ND
2016-10-264790-143-1015ND
2016-11-104790-153-0935ND
2017-01-184790-090-1120ND
2017-02-034790-153-1050ND
2017-03-094790-046-0907ND
2017-03-234790-142-1020ND
2017-04-114790-043-0955ND
2017-04-114790-084-0940ND
2017-04-114790-085-1040ND
2017-04-124790-142-1030ND
2017-04-194790-065-1035ND
2017-04-274790-086-1025ND
2017-05-044790-153-1005ND
2017-06-144790-051-1130ND
2017-06-154790-048-1053ND
2017-07-134790-142-1035ND
2017-08-094790-095-1000ND
2017-08-104790-153-1215ND
2017-09-014790-150-0930ND
2017-09-284790-059-0943ND
2017-10-174790-029-1101ND
2017-10-194790-142-1020ND
2017-11-084790-150-1445ND
2017-11-224790-151-1100ND
2017-12-064790-045-1110ND
2018-01-044790-097-1134ND
2018-01-044790-142-1242ND
2018-01-184790-042-0845ND
2018-02-054790-036-1020ND
2018-02-074790-150-1242ND
2018-02-074790-151-1148ND
2018-04-184790-053-1025ND
2018-04-254790-152-1135ND
2018-05-034790-150-1130ND
2018-05-034790-151-1235ND
2018-05-084790-015-1006ND
2018-05-154790-024-0942ND
2018-06-144790-018-1020ND
2018-07-024790-031-1110ND
2018-07-114790-037-1045ND
2018-07-114790-040-1231ND
2018-07-174790-152-1045ND
2018-08-094790-035-1205ND
2018-08-094790-151-1000ND
2018-08-144790-038-1220ND
2018-08-144790-150-0914ND
2018-08-154790-017-1214ND
2018-08-154790-025-0952ND
2018-08-154790-027-1029ND
2018-10-034790-152-1030ND
2018-10-084790-143-1000ND
2018-10-094790-044-1135ND
2018-10-174790-155-1240ND
2018-11-064790-150-0957ND
2018-11-064790-151-1116ND
2019-01-094790-152-1100ND
2019-01-094790-155-0930ND
2019-02-124790-153-1201ND
2019-02-194790-150-0958ND
2019-02-194790-151-0841ND
2019-04-024790-155-1115ND
2019-04-044790-071-1009ND
2019-04-094790-047-0820ND
2019-06-044790-012-1225ND
2019-07-224790-155-0820ND
2019-08-144790-034-0931ND
2019-08-144790-041-1118ND
2019-10-174790-143-0912ND