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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

USMC - 29 Palms

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

 

59

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND120ND
2015ND230ND
2016ND80ND
2017ND20ND
2018ND120ND
2019ND20ND

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
2014-05-134790-604-1000ND
2014-05-134790-601-1020ND
2014-05-134790-603-1050ND
2014-05-134790-602-1225ND
2014-07-084790-604-1135ND
2014-07-084790-603-1045ND
2014-07-084790-602-1240ND
2014-07-084790-601-1110ND
2014-10-144790-604-1010ND
2014-10-144790-603-1055ND
2014-10-144790-602-1215ND
2014-10-144790-601-1025ND
2015-01-264790-011-1450ND
2015-01-264790-001-1100ND
2015-01-264790-013-1140ND
2015-01-264790-005-1200ND
2015-01-264790-010-1245ND
2015-01-264790-004-1330ND
2015-03-024790-003-1100ND
2015-04-144790-603-1235ND
2015-04-144790-602-1030ND
2015-04-144790-604-1135ND
2015-04-144790-601-1155ND
2015-07-144790-601-1100ND
2015-07-144790-604-1120ND
2015-07-144790-602-1310ND
2015-07-144790-603-1035ND
2015-08-114790-601-1100ND
2015-08-114790-604-1115ND
2015-08-114790-602-1225ND
2015-08-114790-603-1035ND
2015-10-134790-604-1135ND
2015-10-134790-603-1055ND
2015-10-134790-602-1230ND
2015-10-134790-601-1115ND
2016-01-124790-604-1005ND
2016-01-124790-602-1210ND
2016-01-124790-603-1100ND
2016-01-124790-601-1020ND
2016-05-114790-008-1110ND
2016-05-114790-007-1130ND
2016-05-114790-006-1050ND
2016-10-114790-602-0940ND
2017-07-254790-603-1030ND
2017-10-034790-602-1005ND
2018-02-274790-004-1230ND
2018-02-274790-005-1200ND
2018-02-274790-006-1255ND
2018-02-274790-003-1100ND
2018-02-274790-007-1320ND
2018-02-274790-001-1140ND
2018-02-274790-013-1120ND
2018-02-284790-008-1145ND
2018-02-284790-009-1200ND
2018-02-284790-010-1100ND
2018-02-284790-011-1130ND
2018-10-234790-602-1040ND
2019-07-094790-603-1120ND
2019-10-084790-602-0920ND