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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Grand Prairie Bayou 2 PWA

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.01 ppb163ND - 19.2 ppb
20150.618 ppb111ND - 6.80 ppb
2016ND80ND
2017ND80ND
2018ND100ND
20191.000 ppb83ND - 3.40 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
2014-01-1314016002002ND
2014-01-1314016001902ND
2014-01-1314016002202ND
2014-01-1314016002102ND
2014-04-0214093007402ND
2014-04-0214093007602ND
2014-04-02140930075022.90 ppb
2014-04-0214093007702ND
2014-07-0114184002202ND
2014-07-0114184002302ND
2014-07-0114184002502ND
2014-07-0114184002402ND
2014-10-0714282002102ND
2014-10-071428200230219.2 ppb
2014-10-0714282002602ND
2014-10-071428200200210.00 ppb
2015-01-0515008013602ND
2015-01-0515008013702ND
2015-04-01150920079026.80 ppb
2015-04-0115092008002ND
2015-05-0615127013509ND
2015-07-2115204006002ND
2015-07-2115204005902ND
2015-10-0615281005902ND
2015-10-0615281006002ND
2015-11-2315327000401ND
2015-11-2315327000501ND
2016-01-0516008000902ND
2016-01-0516008000802ND
2016-04-0516098002002ND
2016-04-0516098002102ND
2016-07-0616189015902ND
2016-07-0616189015802ND
2016-10-0416279001502ND
2016-10-0416279001402ND
2017-01-0417005015502ND
2017-01-0417005015602ND
2017-04-0417095002302ND
2017-04-0417095002402ND
2017-07-0417187005702ND
2017-07-0417187005802ND
2017-10-0217278004202ND
2017-10-0217278004102ND
2018-01-0318004010702ND
2018-01-0318004010802ND
2018-04-0418095013402ND
2018-04-0418095013502ND
2018-04-1718109015401ND
2018-07-0418186015002ND
2018-07-0418186015102ND
2018-10-0118277000102ND
2018-10-0118277000202ND
2018-10-2418298004801ND
2019-01-0919010015502ND
2019-01-0919010015602ND
2019-02-1219045004602ND
2019-02-1219045004502ND
2019-07-1019192006402ND
2019-07-10191920065021.30 ppb
2019-10-02192770063023.30 ppb
2019-10-02192770061023.40 ppb