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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Fort Bend County Municipal Utility District 112

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.

 

54

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
2016ND40ND
2017ND40ND
20183.97 ppb194ND - 59.4 ppb
20199.11 ppb195ND - 66.6 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
2014-04-15AC50609ND
2014-04-15AC50607ND
2014-04-15AC50595ND
2014-06-03AC55788ND
2015-07-16AC99937ND
2015-07-16AC99944ND
2015-07-16AC99942ND
2015-07-16AC99952ND
2016-04-25AD33983ND
2016-04-25AD34001ND
2016-04-25AD33997ND
2016-09-13AD49172ND
2017-02-21AD71286ND
2017-02-21AD71280ND
2017-02-21AD71278ND
2017-07-11AD88883ND
2018-02-05AE12166ND
2018-02-05AE121804.90 ppb
2018-02-05AE12169ND
2018-02-05AE12163ND
2018-03-14AE18407ND
2018-03-14AE18405ND
2018-03-14AE18409ND
2018-04-10AE21856ND
2018-04-10AE21880ND
2018-04-10AE218738.40 ppb
2018-04-10AE21871ND
2018-08-14AE36847ND
2018-08-14AE3684259.4 ppb
2018-08-14AE36849ND
2018-08-14AE36848ND
2018-10-01AE42208ND
2018-10-01AE422152.80 ppb
2018-10-01AE42213ND
2018-10-01AE42207ND
2019-01-23AE50987ND
2019-01-23AE50981ND
2019-01-23AE50983ND
2019-01-23AE50916ND
2019-01-23AE50917ND
2019-01-23AE5091866.6 ppb
2019-01-23AE50925ND
2019-04-08AE6133844.6 ppb
2019-04-08AE61357ND
2019-04-08AE613321.000 ppb
2019-04-08AE61350ND
2019-07-08AE73420ND
2019-07-08AE7340717.4 ppb
2019-07-08AE73405ND
2019-07-08AE73412ND
2019-10-09AE86116ND
2019-10-09AE86111ND
2019-10-09AE8611543.5 ppb
2019-10-09AE86112ND