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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Harris County FWSD 61

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

 

119

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND220ND
2016ND200ND
2017ND200ND
2018ND200ND
2019ND200ND

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
2014-02-04AC41253ND
2014-02-28AC45278ND
2014-02-28AC45280ND
2014-02-28AC45279ND
2014-02-28AC45277ND
2014-04-01AC48896ND
2014-04-01AC48899ND
2014-04-01AC48900ND
2014-04-01AC48919ND
2014-07-18AC60380ND
2014-07-18AC60376ND
2014-07-18AC60378ND
2014-07-18AC60379ND
2014-11-14AC72110ND
2014-11-14AC72151ND
2014-11-14AC72146ND
2014-11-14AC72180ND
2015-01-23AC77764ND
2015-01-23AC77760ND
2015-01-23AC77759ND
2015-01-23AC77740ND
2015-04-01AC86968ND
2015-04-01AC86972ND
2015-04-01AC86966ND
2015-04-01AC86960ND
2015-04-08AC87692ND
2015-04-08AC87695ND
2015-04-08AC87687ND
2015-04-08AC87693ND
2015-07-16AC99909ND
2015-07-16AC99915ND
2015-07-16AC99921ND
2015-07-16AC99910ND
2015-09-18AD07856ND
2015-10-12AD10203ND
2015-10-12AD10213ND
2015-10-12AD10210ND
2015-10-12AD10212ND
2015-10-12AD10264ND
2016-01-12AD17582ND
2016-01-12AD17592ND
2016-01-12AD17584ND
2016-01-12AD17578ND
2016-01-12AD17538ND
2016-01-12AD17548ND
2016-01-12AD17537ND
2016-01-12AD17545ND
2016-04-08AD32510ND
2016-04-08AD32511ND
2016-04-08AD32521ND
2016-04-08AD32519ND
2016-07-06AD43139ND
2016-07-06AD43119ND
2016-07-06AD43118ND
2016-07-06AD43109ND
2016-11-15AD58001ND
2016-11-15AD58000ND
2016-11-15AD57995ND
2016-11-15AD57994ND
2017-02-02AD68423ND
2017-02-02AD68425ND
2017-02-02AD68455ND
2017-02-02AD68419ND
2017-02-02AD68384ND
2017-02-02AD68383ND
2017-02-02AD68353ND
2017-02-02AD68382ND
2017-04-05AD78505ND
2017-04-05AD78504ND
2017-04-05AD78506ND
2017-04-05AD78503ND
2017-07-12AD89018ND
2017-07-12AD89016ND
2017-07-12AD89015ND
2017-07-12AD89031ND
2017-10-13AE00757ND
2017-10-13AE00756ND
2017-10-13AE00752ND
2017-10-13AE00755ND
2018-03-01AE16316ND
2018-03-01AE16320ND
2018-03-01AE16344ND
2018-03-01AE16318ND
2018-03-01AE16300ND
2018-03-01AE16306ND
2018-03-01AE16307ND
2018-03-01AE16308ND
2018-05-29AE27859ND
2018-05-29AE27850ND
2018-05-29AE27852ND
2018-05-29AE27856ND
2018-08-30AE38933ND
2018-08-30AE38929ND
2018-08-30AE38927ND
2018-08-30AE38926ND
2018-10-03AE42524ND
2018-10-03AE42519ND
2018-10-03AE42543ND
2018-10-03AE42518ND
2019-01-09AE49217ND
2019-01-09AE49215ND
2019-01-09AE49221ND
2019-01-09AE49223ND
2019-02-08AE53727ND
2019-02-08AE53721ND
2019-02-08AE53722ND
2019-02-08AE53726ND
2019-04-01AE60651ND
2019-04-01AE60652ND
2019-04-01AE60649ND
2019-04-01AE60650ND
2019-07-19AE75284ND
2019-07-19AE75283ND
2019-07-19AE75297ND
2019-07-19AE75288ND
2019-10-03AE85664ND
2019-10-03AE85635ND
2019-10-03AE85638ND
2019-10-03AE85645ND