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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Moore

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.

 

158

Samples

0

Samples exceeding legal limit (MCL)

113

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
201312.9 ppb146ND - 35.2 ppb
201427.6 ppb2823ND - 48.1 ppb
201528.9 ppb3426ND - 54.0 ppb
201627.4 ppb4030ND - 59.4 ppb
201725.6 ppb3828ND - 55.2 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
2012-02-152B16058-01ND
2012-02-152B16058-02ND
2012-02-152B16058-03ND
2012-02-152B16058-04ND
2013-03-293D02074-01ND
2013-06-253F25067-01ND
2013-06-253F25067-02ND
2013-06-253F25067-0320.8 ppb
2013-06-253F25067-06ND
2013-09-283I30025-01ND
2013-09-283I30025-02ND
2013-11-253K26107-0135.2 ppb
2013-11-253K26107-0233.0 ppb
2013-11-253K26107-0333.1 ppb
2013-11-253K26107-0433.4 ppb
2013-11-253K26108-01ND
2013-11-253K26108-02ND
2013-11-253K26108-0324.6 ppb
2014-03-134C14011-0140.8 ppb
2014-03-134C14011-0234.9 ppb
2014-03-134C14011-0336.0 ppb
2014-03-134C14011-0436.0 ppb
2014-03-134C14011-05ND
2014-03-134C14011-08ND
2014-05-294E30010-0148.0 ppb
2014-05-294E30010-0234.4 ppb
2014-05-294E30010-0341.1 ppb
2014-05-294E30010-0444.0 ppb
2014-05-294E30010-0523.2 ppb
2014-05-294E30010-0629.1 ppb
2014-08-114H12133-01ND
2014-08-114H12133-02ND
2014-08-114H12133-0316.0 ppb
2014-08-114H12133-0432.0 ppb
2014-08-114H12133-0520.5 ppb
2014-08-114H12134-0145.2 ppb
2014-08-114H12134-0228.2 ppb
2014-08-114H12134-0345.8 ppb
2014-08-114H12134-0448.1 ppb
2014-11-184K18092-0133.0 ppb
2014-11-184K18092-0218.6 ppb
2014-11-184K18092-0324.3 ppb
2014-11-184K18092-0435.3 ppb
2014-12-044L05007-04RE126.3 ppb
2014-12-044L05007-05RE1ND
2014-12-044L05007-06RE130.7 ppb
2015-02-175B17049-0134.2 ppb
2015-02-175B17049-0233.5 ppb
2015-02-175B17049-0335.4 ppb
2015-02-175B17049-0434.7 ppb
2015-03-165C17090-0127.0 ppb
2015-03-165C17090-02ND
2015-03-165C17090-0325.8 ppb
2015-03-165C17090-04ND
2015-05-145E15009-0144.0 ppb
2015-05-145E15009-0245.6 ppb
2015-05-145E15009-0345.8 ppb
2015-05-145E15009-0442.2 ppb
2015-06-245F26009-0137.0 ppb
2015-06-245F26009-0224.8 ppb
2015-06-245F26009-03ND
2015-06-245F26009-04ND
2015-08-175H18116-0734.9 ppb
2015-08-175H18116-0833.6 ppb
2015-08-185H18116-0152.5 ppb
2015-08-185H18116-0251.8 ppb
2015-08-185H18116-0354.0 ppb
2015-08-185H18116-0452.3 ppb
2015-11-195K20004-0152.8 ppb
2015-11-195K20004-0214.7 ppb
2015-11-195K20004-0346.3 ppb
2015-11-195K20004-0450.7 ppb
2015-12-085L08161-0427.8 ppb
2015-12-085L08161-0829.1 ppb
2015-12-085L08161-0923.7 ppb
2015-12-085L08161-10ND
2015-12-225L22074-01ND
2015-12-225L22074-0227.1 ppb
2015-12-225L22074-03ND
2015-12-225L22074-04ND
2016-02-166B16079-0139.4 ppb
2016-02-166B16079-024.14 ppb
2016-02-166B16079-0340.8 ppb
2016-02-166B16079-0438.8 ppb
2016-02-226B23061-03ND
2016-02-226B23061-0525.5 ppb
2016-02-236B23061-044.40 ppb
2016-03-246C25003-0136.8 ppb
2016-03-246C25003-02ND
2016-03-246C25003-0329.5 ppb
2016-03-246C25003-0432.0 ppb
2016-03-246C25003-0537.2 ppb
2016-04-286D29012-01ND
2016-04-286D29012-0218.6 ppb
2016-04-286D29012-03ND
2016-04-286D29012-04ND
2016-04-286D29012-0515.6 ppb
2016-05-056E06012-0151.1 ppb
2016-05-056E06012-0217.3 ppb
2016-05-056E06012-0349.1 ppb
2016-05-056E06012-0451.2 ppb
2016-08-186H19015-01ND
2016-08-186H19015-0336.3 ppb
2016-08-186H19015-04ND
2016-08-186H19015-05ND
2016-08-186H19015-0639.5 ppb
2016-08-186H19019-0151.4 ppb
2016-08-186H19019-0219.1 ppb
2016-08-186H19019-0353.3 ppb
2016-08-186H19019-0454.0 ppb
2016-11-296K30029-0147.1 ppb
2016-11-296K30029-0242.4 ppb
2016-11-296K30029-0359.4 ppb
2016-11-296K30029-04RE147.3 ppb
2016-12-286L29046-0140.6 ppb
2016-12-286L29046-02ND
2016-12-286L29046-0335.0 ppb
2016-12-286L29046-0443.2 ppb
2016-12-286L29046-0534.9 ppb
2016-12-286L29046-06ND
2017-02-237B24006-0234.6 ppb
2017-02-237B24006-0334.5 ppb
2017-02-237B24006-0443.2 ppb
2017-02-287C01024-0139.6 ppb
2017-03-237C24009-0130.7 ppb
2017-03-237C24009-02ND
2017-03-237C24009-0332.5 ppb
2017-03-237C24009-04ND
2017-03-237C24009-05ND
2017-03-237C24009-0631.2 ppb
2017-05-157E16017-0140.3 ppb
2017-05-157E16017-0225.7 ppb
2017-05-157E16017-0338.3 ppb
2017-05-157E16017-0441.7 ppb
2017-06-297F29076-02ND
2017-06-297F29076-0321.3 ppb
2017-06-297F29076-04ND
2017-06-297F29076-05ND
2017-06-307G03081-01ND
2017-06-307G03081-02ND
2017-08-247H25008-0150.2 ppb
2017-08-247H25008-0235.5 ppb
2017-08-247H25008-0355.2 ppb
2017-08-247H25008-0455.0 ppb
2017-09-117I12038-0525.9 ppb
2017-10-317K01144-01ND
2017-10-317K01144-02ND
2017-10-317K01144-0326.0 ppb
2017-10-317K01144-0442.0 ppb
2017-10-317K01144-053.69 ppb
2017-10-317K01144-063.82 ppb
2017-10-317K01144-0736.0 ppb
2017-10-317K01144-0822.3 ppb
2017-10-317K01144-0915.3 ppb
2017-11-077K07136-0144.5 ppb
2017-11-077K07136-0246.0 ppb
2017-11-077K07136-0349.4 ppb
2017-11-077K07136-0448.4 ppb