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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Matagorda County Water Control and Improvement District 5

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND10ND
2014ND10ND
2015ND20ND
2016ND30ND
2017ND50ND

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
2013-09-30AC31661ND
2014-08-12AC63211ND
2015-05-21AC92970ND
2015-05-21AC93033ND
2016-07-21AD45179ND
2016-07-21AD45259ND
2016-12-05AD60403ND
2017-02-08AD69628ND
2017-03-28AD77166ND
2017-05-18AD84846ND
2017-05-18AD84895ND
2017-07-31AD91407ND