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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Brigham City Water System

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.300 ppb41ND - 1.20 ppb
20130.0294 ppb171ND - 0.500 ppb
20140.350 ppb41ND - 1.40 ppb
2015ND50ND
20160.0700 ppb101ND - 0.700 ppb
2017ND30ND

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 Result
2012-07-231.20 ppb
2012-07-23ND
2012-07-23ND
2012-07-23ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-05-29ND
2013-06-26ND
2013-06-26ND
2013-07-31ND
2013-08-140.500 ppb
2013-08-14ND
2013-08-14ND
2013-08-14ND
2013-09-04ND
2013-09-04ND
2014-07-101.40 ppb
2014-07-10ND
2014-07-10ND
2014-07-10ND
2015-01-27ND
2015-03-23ND
2015-05-07ND
2015-10-21ND
2015-10-21ND
2016-03-23ND
2016-05-04ND
2016-05-04ND
2016-05-18ND
2016-05-18ND
2016-06-09ND
2016-06-090.700 ppb
2016-06-09ND
2016-08-17ND
2016-08-17ND
2017-02-23ND
2017-09-13ND
2017-09-13ND