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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Wolfforth

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.900 ppb110.900 ppb
2013ND110ND
20140.735 ppb21ND - 1.47 ppb
2015ND30ND
2016ND30ND
2017ND20ND

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
2012-05-02AB888120.900 ppb
2013-01-311302025032ND
2013-05-30Q1301737012ND
2013-05-30Q1301737020ND
2013-05-30Q1301737019ND
2013-05-30Q1301737018ND
2013-05-30Q1301737017ND
2013-05-30Q1301737016ND
2013-05-30Q1301737015ND
2013-05-30Q1301737014ND
2013-05-30Q1301737013ND
2013-05-30Q1301737011ND
2014-03-26Q14098730051.47 ppb
2014-07-22Q1429940006ND
2015-03-16Q1509516008ND
2015-03-16Q1509516005ND
2015-06-25Q1524201006ND
2016-05-25Q1620718011ND
2016-05-25Q1620718003ND
2016-05-25Q1620718002ND
2017-05-25Q1722532006ND
2017-11-30Q1761852002ND