Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

US Army Fort Irwin

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

 

89

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.267 ppb61ND - 1.60 ppb
20150.234 ppb272ND - 5.80 ppb
20160.0320 ppb201ND - 0.640 ppb
20170.309 ppb164ND - 2.00 ppb
20180.102 ppb182ND - 0.960 ppb
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
2014-07-094790-009-0830ND
2014-07-234790-605-15151.60 ppb
2014-07-234790-604-1700ND
2014-07-234790-603-1605ND
2014-07-234790-602-1535ND
2014-07-234790-601-1455ND
2015-01-294790-604-1000ND
2015-01-294790-603-0945ND
2015-01-294790-602-0915ND
2015-01-294790-605-0800ND
2015-01-294790-601-0745ND
2015-04-234790-604-1245ND
2015-04-234790-603-1000ND
2015-04-234790-605-09350.530 ppb
2015-04-234790-602-1215ND
2015-04-234790-601-0920ND
2015-07-014790-001-1530ND
2015-08-054790-603-1320ND
2015-08-054790-605-1300ND
2015-08-054790-602-1345ND
2015-08-054790-601-1245ND
2015-08-054790-604-1400ND
2015-09-014790-002-1930ND
2015-09-164790-003-1740ND
2015-09-174790-009-1930ND
2015-09-234790-012-1700ND
2015-09-304790-013-1520ND
2015-10-124790-602-0920ND
2015-10-124790-603-0950ND
2015-10-124790-604-1020ND
2015-10-124790-605-08505.80 ppb
2015-10-124790-601-0830ND
2015-11-114790-012-1600ND
2016-01-274790-602-1115ND
2016-01-274790-604-1040ND
2016-01-274790-603-1230ND
2016-01-274790-601-1320ND
2016-01-274790-605-1300ND
2016-04-204790-601-1325ND
2016-04-204790-604-1215ND
2016-04-204790-603-1300ND
2016-04-204790-603-1230ND
2016-04-204790-605-1345ND
2016-07-064790-019-0715ND
2016-07-134790-019-0610ND
2016-07-214790-019-0615ND
2016-07-284790-019-0625ND
2016-08-044790-019-0630ND
2016-08-124790-019-0610ND
2016-10-124790-604-0925ND
2016-10-124790-603-08150.640 ppb
2016-10-124790-602-0840ND
2016-10-124790-601-0740ND
2017-01-114790-606-13120.650 ppb
2017-01-174790-602-0810ND
2017-01-174790-601-0745ND
2017-01-174790-603-0850ND
2017-04-114790-606-13400.700 ppb
2017-04-114790-602-1045ND
2017-04-114790-603-1010ND
2017-04-114790-601-1110ND
2017-07-124790-606-12382.00 ppb
2017-07-214790-603-0940ND
2017-07-214790-602-1100ND
2017-07-214790-601-0915ND
2017-10-124790-606-14051.60 ppb
2017-11-064790-603-1045ND
2017-11-064790-602-1020ND
2017-11-064790-601-1107ND
2018-01-164790-606-13450.870 ppb
2018-01-174790-603-1405ND
2018-01-174790-601-1250ND
2018-01-174790-602-1502ND
2018-05-254790-601-1235ND
2018-05-304790-601-0735ND
2018-06-124790-016-1105ND
2018-06-144790-017-0939ND
2018-07-104790-013-1235ND
2018-07-104790-009-1145ND
2018-07-104790-003-1400ND
2018-07-104790-002-1021ND
2018-07-104790-001-1045ND
2018-07-194790-601-1240ND
2018-07-194790-606-13300.960 ppb
2018-07-234790-012-0845ND
2018-10-254790-606-1335ND
2018-10-314790-606-1435ND
2019-06-114790-601-1500ND
2019-11-264790-606-1048ND