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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Benton City WSC

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

 

124

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.1000 ppb191ND - 1.90 ppb
20150.786 ppb223ND - 8.20 ppb
20160.259 ppb222ND - 4.10 ppb
20170.300 ppb203ND - 3.90 ppb
20180.0550 ppb201ND - 1.10 ppb
20190.119 ppb212ND - 1.30 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
2014-02-13AC42764ND
2014-02-13AC42760ND
2014-02-13AC42771ND
2014-02-13AC42765ND
2014-05-05AC53027ND
2014-05-05AC53013ND
2014-05-05AC53009ND
2014-05-05AC52959ND
2014-05-05AC52877ND
2014-05-05AC528691.90 ppb
2014-05-05AC52873ND
2014-09-19AC67730ND
2014-09-19AC67697ND
2014-09-19AC67694ND
2014-09-19AC67696ND
2014-10-17AC70060ND
2014-10-17AC70058ND
2014-10-17AC70082ND
2014-10-17AC70059ND
2015-01-30AC78785ND
2015-01-30AC78733ND
2015-01-30AC78670ND
2015-01-30AC78722ND
2015-01-30AC78675ND
2015-04-06AC87361ND
2015-04-06AC87363ND
2015-04-06AC873592.20 ppb
2015-04-06AC87332ND
2015-04-06AC87331ND
2015-04-06AC87324ND
2015-04-06AC87328ND
2015-07-14AC99346ND
2015-07-14AC99348ND
2015-07-14AC99350ND
2015-09-02AD054696.90 ppb
2015-09-02AD05287ND
2015-10-06AD09596ND
2015-10-06AD09579ND
2015-10-06AD09578ND
2015-10-06AD09573ND
2015-10-06AD096298.20 ppb
2016-01-28AD20722ND
2016-01-28AD20748ND
2016-01-28AD20750ND
2016-01-28AD207624.10 ppb
2016-01-28AD20693ND
2016-01-28AD20694ND
2016-01-28AD20687ND
2016-01-28AD20688ND
2016-05-02AD34824ND
2016-05-02AD34816ND
2016-05-02AD34798ND
2016-05-02AD34797ND
2016-07-14AD442431.60 ppb
2016-07-14AD44242ND
2016-07-14AD44248ND
2016-07-14AD44238ND
2016-07-14AD44309ND
2016-11-04AD56774ND
2016-11-04AD56783ND
2016-11-04AD56772ND
2016-11-04AD56786ND
2016-11-04AD56841ND
2017-03-16AD75863ND
2017-03-16AD75861ND
2017-03-16AD75850ND
2017-03-16AD75851ND
2017-03-16AD75852ND
2017-03-16AD75853ND
2017-05-23AD854981.10 ppb
2017-05-23AD85418ND
2017-05-23AD85419ND
2017-05-23AD85421ND
2017-05-23AD85420ND
2017-08-09AD925643.90 ppb
2017-08-09AD92546ND
2017-08-09AD925441.000 ppb
2017-08-09AD92548ND
2017-08-09AD92547ND
2017-10-02AD99020ND
2017-10-02AD99000ND
2017-10-02AD99001ND
2017-10-02AD98999ND
2018-01-26AE10956ND
2018-01-26AE10955ND
2018-01-26AE10958ND
2018-01-26AE10957ND
2018-04-02AE20847ND
2018-04-02AE20851ND
2018-04-02AE20829ND
2018-04-02AE20830ND
2018-04-02AE20814ND
2018-05-31AE283001.10 ppb
2018-05-31AE28254ND
2018-08-10AE36668ND
2018-08-10AE36558ND
2018-08-10AE36587ND
2018-08-10AE36571ND
2018-08-10AE36579ND
2018-11-16AE46458ND
2018-11-16AE46460ND
2018-11-16AE46464ND
2018-11-16AE46461ND
2019-01-30AE52246ND
2019-01-30AE52204ND
2019-01-30AE52200ND
2019-01-30AE52174ND
2019-01-30AE52155ND
2019-01-30AE52173ND
2019-01-30AE52172ND
2019-04-18AE62995ND
2019-04-18AE62943ND
2019-04-18AE62941ND
2019-04-18AE62949ND
2019-04-18AE62942ND
2019-07-11AE74106ND
2019-07-11AE741301.20 ppb
2019-07-11AE74101ND
2019-07-11AE74131ND
2019-10-07AE85801ND
2019-10-07AE857961.30 ppb
2019-10-07AE85794ND
2019-12-18AE92760ND
2019-12-18AE92754ND