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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Cdcr-high Desert State Prison

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

150

Samples

0

Samples exceeding legal limit (MCL)

30

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.950 ppb164ND - 5.30 ppb
20150.525 ppb3211ND - 3.90 ppb
20160.258 ppb449ND - 1.67 ppb
20170.235 ppb172ND - 2.00 ppb
20180.118 ppb171ND - 2.00 ppb
20190.179 ppb243ND - 2.00 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-055867-801-11255.30 ppb
2014-02-055867-802-10001.60 ppb
2014-05-075867-801-10425.00 ppb
2014-05-075867-802-09443.30 ppb
2014-06-101677-004-0930ND
2014-06-101677-011-0900ND
2014-06-101677-012-0810ND
2014-08-051677-801-1020ND
2014-08-051677-802-1000ND
2014-08-261677-005-0840ND
2014-09-161677-010-0917ND
2014-10-071677-010-0835ND
2014-11-041677-010-0830ND
2014-11-181677-801-0930ND
2014-11-181677-802-0920ND
2014-12-021677-010-0935ND
2015-01-061677-010-0830ND
2015-02-031677-010-0920ND
2015-02-031677-801-0955ND
2015-02-031677-802-0930ND
2015-03-031677-010-0950ND
2015-03-171677-003-0924ND
2015-03-311677-801-09100.870 ppb
2015-03-311677-802-08000.710 ppb
2015-04-071677-010-0830ND
2015-04-071677-028-0840ND
2015-04-071677-801-09000.940 ppb
2015-05-051677-010-0906ND
2015-05-051677-028-09451.71 ppb
2015-05-051677-801-09563.90 ppb
2015-06-021677-010-0855ND
2015-06-021677-028-08331.16 ppb
2015-06-021677-801-09252.50 ppb
2015-07-071677-010-0831ND
2015-07-071677-028-09420.670 ppb
2015-08-271677-010-1049ND
2015-08-271677-028-1110ND
2015-09-011677-801-0917ND
2015-09-011677-802-0855ND
2015-09-151677-010-0855ND
2015-09-151677-028-09502.34 ppb
2015-10-061677-010-0923ND
2015-10-061677-028-10200.870 ppb
2015-11-031677-010-0835ND
2015-11-031677-016-0959ND
2015-12-011677-010-1123ND
2015-12-011677-027-08391.13 ppb
2015-12-011677-028-0935ND
2016-01-051677-010-0804ND
2016-01-051677-027-08371.44 ppb
2016-01-051677-028-0910ND
2016-02-021677-010-0900ND
2016-02-021677-027-09151.26 ppb
2016-02-021677-028-1030ND
2016-03-011677-010-0915ND
2016-03-011677-027-08401.19 ppb
2016-03-011677-028-0905ND
2016-04-051677-010-0828ND
2016-04-051677-027-09061.25 ppb
2016-04-051677-028-0935ND
2016-05-031677-010-0833ND
2016-05-031677-016-0842ND
2016-05-031677-027-08551.67 ppb
2016-06-071677-010-0847ND
2016-06-071677-016-0932ND
2016-06-071677-027-0913ND
2016-07-051677-010-0846ND
2016-07-051677-016-0920ND
2016-07-051677-027-08321.24 ppb
2016-08-021677-010-0839ND
2016-08-021677-016-0930ND
2016-08-021677-027-08530.690 ppb
2016-08-231677-018-0823ND
2016-08-301677-010-0900ND
2016-09-061677-010-0920ND
2016-09-061677-018-0922ND
2016-09-061677-027-0850ND
2016-09-061677-028-0948ND
2016-09-131677-010-0930ND
2016-09-131677-018-0930ND
2016-09-201677-010-0835ND
2016-09-271677-010-0833ND
2016-09-271677-018-0833ND
2016-10-041677-010-0920ND
2016-10-041677-016-1023ND
2016-10-041677-027-09471.54 ppb
2016-11-011677-010-0912ND
2016-11-011677-016-0926ND
2016-11-011677-027-08421.09 ppb
2016-11-081677-010-0930ND
2016-11-081677-018-0935ND
2016-11-291677-010-0912ND
2017-02-141677-010-0903ND
2017-03-071677-010-0855ND
2017-04-041677-010-0955ND
2017-05-021677-010-0845ND
2017-06-061677-010-0835ND
2017-07-055867-010-0856ND
2017-07-055867-801-10072.00 ppb
2017-07-055867-802-09532.00 ppb
2017-08-025867-010-0956ND
2017-09-065867-010-0953ND
2017-10-045867-010-1012ND
2017-11-015867-010-1021ND
2017-11-085867-010-0956ND
2017-11-085867-018-0958ND
2017-11-205867-010-0935ND
2017-11-205867-018-0936ND
2017-12-205867-010-0926ND
2018-02-075867-010-0950ND
2018-02-215867-010-1023ND
2018-05-025867-010-0935ND
2018-07-115867-010-0838ND
2018-07-115867-802-0852ND
2018-08-015867-010-1003ND
2018-08-015867-801-10142.00 ppb
2018-08-085867-010-1013ND
2018-08-085867-018-1015ND
2018-09-055867-010-0952ND
2018-09-055867-018-0953ND
2018-10-105867-010-0928ND
2018-10-105867-018-0928ND
2018-11-195867-010-1018ND
2018-11-195867-018-1018ND
2018-12-055867-010-1046ND
2018-12-055867-018-1046ND
2019-01-025867-010-0924ND
2019-01-025867-018-0925ND
2019-02-065867-010-0905ND
2019-02-065867-018-0905ND
2019-03-065867-010-0935ND
2019-03-065867-018-0935ND
2019-05-015867-010-0933ND
2019-05-015867-018-0933ND
2019-06-125867-010-1032ND
2019-06-125867-018-1040ND
2019-07-015867-010-1020ND
2019-07-015867-018-1020ND
2019-07-105867-801-10402.00 ppb
2019-07-105867-802-10201.000 ppb
2019-08-075867-010-0923ND
2019-08-075867-018-0921ND
2019-09-045867-010-1002ND
2019-09-045867-018-1002ND
2019-10-025867-010-0956ND
2019-10-025867-018-09551.30 ppb
2019-11-065867-010-0950ND
2019-11-065867-018-0950ND
2019-12-045867-010-0930ND
2019-12-045867-018-0930ND