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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Idalou

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

 

52

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND140ND
2016ND80ND
2017ND80ND
2018ND80ND
2019ND80ND

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
2014-03-13Q1408243010ND
2014-06-17Q1421629004ND
2014-06-17Q1421629003ND
2014-06-17Q1421629006ND
2014-09-18Q1445932006ND
2014-12-16Q1460431001ND
2015-03-25Q1511064012ND
2015-03-25Q1511064010ND
2015-03-25Q1511064008ND
2015-03-25Q1511064002ND
2015-06-23Q1523309007ND
2015-06-23Q1523309001ND
2015-09-09Q1534947007ND
2015-09-09Q1534947001ND
2015-09-09Q1534947004ND
2015-09-09Q1534947005ND
2015-11-18Q1545682007ND
2015-11-18Q1545682006ND
2015-11-18Q1545682003ND
2015-11-18Q1545682002ND
2016-03-08Q1609690004ND
2016-03-08Q1609690002ND
2016-06-08Q1622881008ND
2016-06-08Q1622881004ND
2016-06-08Q1622881002ND
2016-09-08Q1636371004ND
2016-09-08Q1636371001ND
2016-12-13Q1654189002ND
2017-03-14Q1710443001ND
2017-06-07Q1724059004ND
2017-06-07Q1724059002ND
2017-07-25Q1730586001ND
2017-07-25Q1730586009ND
2017-10-12Q1752321004ND
2017-10-12Q1752321003ND
2017-10-25Q1755075001ND
2018-03-21Q1811486001ND
2018-03-21Q1811486005ND
2018-04-26Q1816940004ND
2018-04-26Q1816940005ND
2018-08-02Q1830692004ND
2018-08-02Q1830692001ND
2018-10-25Q1842795003ND
2018-11-29Q1848727002ND
2019-01-30Q1904476005ND
2019-04-10Q1914418007ND
2019-04-10Q1914418004ND
2019-04-10Q1914418002ND
2019-09-11Q1963950009ND
2019-09-11Q1963950002ND
2019-09-11Q1963950005ND
2019-10-31Q1974682001ND