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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Forrest City Waterworks

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.176 ppb212ND - 2.40 ppb
20150.140 ppb101ND - 1.40 ppb
20160.109 ppb111ND - 1.20 ppb
20170.1000 ppb131ND - 1.30 ppb
20180.0929 ppb141ND - 1.30 ppb
20190.275 ppb112ND - 2.20 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
2014-02-0514038000602ND
2014-02-0514038000701ND
2014-03-1714079001002ND
2014-03-1714079001202ND
2014-03-1714079001102ND
2014-03-1714079001302ND
2014-04-2314114014301ND
2014-04-2314114013809ND
2014-04-2314114014002ND
2014-06-2514177008902ND
2014-06-2514177009002ND
2014-06-25141770088021.30 ppb
2014-06-2514177009102ND
2014-08-2714240000702ND
2014-08-2714240002902ND
2014-08-27142400031022.40 ppb
2014-08-2714240003002ND
2014-08-2714240002502ND
2014-08-2714240001201ND
2014-11-2414330003701ND
2014-11-2414330003801ND
2015-01-1215015008501ND
2015-01-1215015008601ND
2015-04-0815099007301ND
2015-04-0815099007201ND
2015-04-0815099009902ND
2015-08-2415238000701ND
2015-08-2415238000602ND
2015-08-24152380008021.40 ppb
2015-12-0115337004901ND
2015-12-0115337004801ND
2016-02-1616049005401ND
2016-02-1616049005301ND
2016-04-2016112007601ND
2016-04-2016112007501ND
2016-06-0816161004202ND
2016-07-06161890160021.20 ppb
2016-07-0616189013609ND
2016-07-0616189013509ND
2016-08-2416237004701ND
2016-10-0316279003208ND
2016-10-0316279003108ND
2017-01-1617019008401ND
2017-01-1617019008501ND
2017-04-0317096004801ND
2017-04-0317096004702ND
2017-04-0317096000209ND
2017-04-0317096000101ND
2017-07-0317187007001ND
2017-07-0317187007101ND
2017-07-0317187007202ND
2017-07-04171870061021.30 ppb
2017-10-0317278005801ND
2017-10-0317278005701ND
2017-10-0317278005602ND
2018-01-1818019004701ND
2018-02-2618060000101ND
2018-02-2618060000201ND
2018-04-2518116002501ND
2018-04-2518116002402ND
2018-04-2518116002301ND
2018-04-2518116002201ND
2018-07-0918193004401ND
2018-07-0918193004501ND
2018-07-09181930042021.30 ppb
2018-07-0918193004301ND
2018-10-1518291005601ND
2018-10-1518291006601ND
2018-10-1518291006701ND
2019-01-1419017002301ND
2019-01-1419017002501ND
2019-01-1419017002401ND
2019-04-2319115006801ND
2019-04-2319115006001ND
2019-04-2319115006901ND
2019-05-2919150003302ND
2019-07-2319206006803ND
2019-07-23192060072010.830 ppb
2019-07-2319206006709ND
2019-08-13192270094022.20 ppb