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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Fort Bend County MUD 25

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.700 ppb110.700 ppb
2013ND40ND
2014ND20ND
20150.867 ppb62ND - 4.00 ppb
20160.400 ppb62ND - 1.20 ppb
2017ND40ND

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
2012-03-20AB845320.700 ppb
2013-02-28AC11759ND
2013-05-09AC19037ND
2013-05-09AC19043ND
2013-05-09AC19046ND
2014-05-16AC54418ND
2014-05-16AC54455ND
2015-02-04AC79293ND
2015-02-04AC79295ND
2015-02-04AC792651.20 ppb
2015-02-04AC79289ND
2015-06-02AC94116ND
2015-06-02AC941684.00 ppb
2016-01-19AD18648ND
2016-01-19AD18642ND
2016-01-19AD186221.20 ppb
2016-06-21AD413531.20 ppb
2016-06-21AD41365ND
2016-08-02AD46709ND
2017-01-12AD64770ND
2017-01-12AD64784ND
2017-01-12AD64774ND
2017-05-19AD85046ND