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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Sardis Water Association

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

 

100

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201412.3 ppb208ND - 68.0 ppb
201510.8 ppb185ND - 65.8 ppb
201612.3 ppb164ND - 54.7 ppb
201712.5 ppb166ND - 77.0 ppb
201812.4 ppb184ND - 87.5 ppb
201918.6 ppb125ND - 67.6 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
2014-01-071401000110235.4 ppb
2014-01-07140100013021.50 ppb
2014-01-0714010001202ND
2014-01-07140100014024.30 ppb
2014-01-131401600300234.6 ppb
2014-01-13140160033021.60 ppb
2014-01-1314016003102ND
2014-01-1314016003202ND
2014-04-0214093006502ND
2014-04-021409300800243.5 ppb
2014-04-0214093006702ND
2014-04-0214093006602ND
2014-07-071419100120268.0 ppb
2014-07-0714191000702ND
2014-07-0714191000802ND
2014-07-0714191001102ND
2014-10-0814282014002ND
2014-10-0814282014202ND
2014-10-081428201450256.9 ppb
2014-10-0814282014102ND
2015-01-071500801710229.6 ppb
2015-01-0715008016802ND
2015-01-0715008017002ND
2015-01-0715008016902ND
2015-04-071509900860243.2 ppb
2015-04-0715099008102ND
2015-04-0715099007902ND
2015-04-0715099008002ND
2015-07-0615189002202ND
2015-07-061518900200265.8 ppb
2015-07-0615189002102ND
2015-07-0615189002302ND
2015-10-0715281006702ND
2015-10-0715281006502ND
2015-10-071528100390255.7 ppb
2015-10-0715281006602ND
2015-11-16153200006090.590 ppb
2015-11-1615320000709ND
2016-01-0716008003602ND
2016-01-0716008003502ND
2016-01-0716008003402ND
2016-01-071600800370242.5 ppb
2016-04-061609800270247.8 ppb
2016-04-0616098002602ND
2016-04-0616098003902ND
2016-04-0616098002802ND
2016-07-0416189001502ND
2016-07-041618900120254.7 ppb
2016-07-0416189001602ND
2016-07-0416189001102ND
2016-10-051628001730251.4 ppb
2016-10-0516280017602ND
2016-10-0516280017402ND
2016-10-0516280017502ND
2017-01-041700500830229.7 ppb
2017-01-0417005008402ND
2017-01-0417005008502ND
2017-01-0417005008202ND
2017-04-0317096000902ND
2017-04-031709600080238.7 ppb
2017-04-0317096001102ND
2017-04-0317096001002ND
2017-07-0317187014002ND
2017-07-041718701410277.0 ppb
2017-07-0417187013902ND
2017-07-0417187014202ND
2017-10-0217278015202ND
2017-10-021727801510252.3 ppb
2017-10-02172780150021.10 ppb
2017-10-02172780153021.40 ppb
2018-01-021800400050230.4 ppb
2018-01-0218004001502ND
2018-01-0218004000202ND
2018-01-0218004000302ND
2018-04-0218095015302ND
2018-04-021809501600249.7 ppb
2018-04-0218095014802ND
2018-04-0218095014702ND
2018-07-0418186015802ND
2018-07-0418186016002ND
2018-07-0418186015902ND
2018-07-041818601570287.5 ppb
2018-10-0218277012402ND
2018-10-021827701080255.5 ppb
2018-10-0218277012202ND
2018-10-0218277012302ND
2018-10-3018304002509ND
2018-10-3018304002409ND
2019-01-0819011003801ND
2019-01-0819011002401ND
2019-01-0819011002301ND
2019-01-081901100370147.1 ppb
2019-07-091919201280258.2 ppb
2019-07-091919201290248.4 ppb
2019-07-09191920125021.30 ppb
2019-07-0919192013002ND
2019-10-0119276008202ND
2019-10-0119276008102ND
2019-10-011927600800267.6 ppb
2019-10-0119276007102ND