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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Garden City

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.174 ppb163ND - 1.10 ppb
20150.217 ppb165ND - 0.950 ppb
20160.378 ppb168ND - 1.000 ppb
20170.431 ppb168ND - 1.70 ppb
20180.227 ppb165ND - 0.890 ppb
20190.144 ppb164ND - 0.630 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
2014-02-1060032ND
2014-02-1060026ND
2014-02-1060015ND
2014-02-1060011ND
2014-05-05109964ND
2014-05-05109963ND
2014-05-05109962ND
2014-05-05109961ND
2014-08-04166941ND
2014-08-041669400.910 ppb
2014-08-04166942ND
2014-08-04166943ND
2014-11-13234679ND
2014-11-132346780.770 ppb
2014-11-13234677ND
2014-11-132346761.10 ppb
2015-02-02271203ND
2015-02-02271202ND
2015-02-02271201ND
2015-02-02271200ND
2015-05-04329104ND
2015-05-04329105ND
2015-05-04329107ND
2015-05-043291060.810 ppb
2015-08-04379181ND
2015-08-04379180ND
2015-08-04379179ND
2015-08-04379178ND
2015-11-024281110.500 ppb
2015-11-024281100.950 ppb
2015-11-024281090.500 ppb
2015-11-024281080.710 ppb
2016-02-08490848ND
2016-02-08490847ND
2016-02-08490849ND
2016-02-08490850ND
2016-05-23551388ND
2016-05-235513870.880 ppb
2016-05-235513860.600 ppb
2016-05-23551385ND
2016-08-096009371.000 ppb
2016-08-096009360.500 ppb
2016-08-096009350.870 ppb
2016-08-096009340.590 ppb
2016-11-07656798ND
2016-11-076568010.670 ppb
2016-11-07656800ND
2016-11-076567990.940 ppb
2017-02-127084560.560 ppb
2017-02-13708459ND
2017-02-137084580.590 ppb
2017-02-137084570.520 ppb
2017-05-16762950ND
2017-05-16762949ND
2017-05-16762948ND
2017-05-16762947ND
2017-08-148197811.20 ppb
2017-08-148197891.70 ppb
2017-08-148197911.10 ppb
2017-08-218239760.560 ppb
2017-11-13878143ND
2017-11-13878142ND
2017-11-138781410.670 ppb
2017-11-13878140ND
2018-02-05908262ND
2018-02-05908261ND
2018-02-05908260ND
2018-02-05908259ND
2018-05-14970948ND
2018-05-14970949ND
2018-05-14970951ND
2018-05-14970950ND
2018-08-2710326030.890 ppb
2018-08-271032602ND
2018-08-271032601ND
2018-08-271032600ND
2018-11-0610744080.800 ppb
2018-11-0610744070.690 ppb
2018-11-0610744050.540 ppb
2018-11-0610744040.710 ppb
2019-02-111120209ND
2019-02-111120208ND
2019-02-111120210ND
2019-02-111120211ND
2019-05-061157871ND
2019-05-061157870ND
2019-05-0611578690.520 ppb
2019-05-061157868ND
2019-08-121222414ND
2019-08-121222413ND
2019-08-121222412ND
2019-08-121222411ND
2019-11-1212742170.550 ppb
2019-11-1212742200.630 ppb
2019-11-1212742190.600 ppb
2019-11-121274218ND