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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Dodge 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

 

92

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
20151.43 ppb162ND - 21.0 ppb
20166.04 ppb168ND - 58.0 ppb
20174.88 ppb124ND - 55.0 ppb
20180.246 ppb165ND - 1.10 ppb
20190.356 ppb165ND - 2.10 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
2014-02-1160092ND
2014-02-1160063ND
2014-02-1160058ND
2014-02-1160054ND
2014-05-05109118ND
2014-05-05109117ND
2014-05-05109116ND
2014-05-05109115ND
2014-08-04166967ND
2014-08-05166961ND
2014-08-05166960ND
2014-08-05166962ND
2014-11-03223426ND
2014-11-03223410ND
2014-11-03223409ND
2014-11-03223397ND
2015-02-02270190ND
2015-02-02270189ND
2015-02-02270188ND
2015-02-02270187ND
2015-05-04322041ND
2015-05-04322040ND
2015-05-04322042ND
2015-05-04322043ND
2015-08-03377199ND
2015-08-03377198ND
2015-08-03377197ND
2015-08-03377196ND
2015-11-034279901.80 ppb
2015-11-0342798921.0 ppb
2015-11-03427988ND
2015-11-03427987ND
2016-02-084901520.840 ppb
2016-02-08490149ND
2016-02-0849015058.0 ppb
2016-02-08490151ND
2016-05-03537548ND
2016-05-0353754731.0 ppb
2016-05-03537546ND
2016-05-035375451.20 ppb
2016-08-085987620.680 ppb
2016-08-08598761ND
2016-08-085987590.900 ppb
2016-08-08598758ND
2016-11-07656251ND
2016-11-076562490.780 ppb
2016-11-07656248ND
2016-11-076562473.30 ppb
2017-02-06703810ND
2017-02-28714783ND
2017-02-28714782ND
2017-02-28714781ND
2017-08-0881462755.0 ppb
2017-08-21823289ND
2017-08-218232771.90 ppb
2017-08-22823302ND
2017-11-068716380.590 ppb
2017-11-068716361.10 ppb
2017-11-06871637ND
2017-11-06871639ND
2018-02-05907830ND
2018-02-05907829ND
2018-02-05907828ND
2018-02-059078270.570 ppb
2018-05-07966206ND
2018-05-07966205ND
2018-05-07966204ND
2018-05-07966203ND
2018-08-1310243670.620 ppb
2018-08-131024363ND
2018-08-131024364ND
2018-08-1310243660.820 ppb
2018-11-051070505ND
2018-11-0510705040.830 ppb
2018-11-051070503ND
2018-11-0510705021.10 ppb
2019-02-041113659ND
2019-02-041113660ND
2019-02-041113661ND
2019-02-0411136621.60 ppb
2019-05-0611576660.540 ppb
2019-05-061157665ND
2019-05-0611576640.510 ppb
2019-05-061157663ND
2019-08-051214943ND
2019-08-051214942ND
2019-08-051214940ND
2019-08-0512149392.10 ppb
2019-11-051268846ND
2019-11-051268847ND
2019-11-0512688480.950 ppb
2019-11-051268845ND