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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Farmington 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.

 

68

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.388 ppb85ND - 0.700 ppb
20130.430 ppb206ND - 2.70 ppb
20140.0600 ppb101ND - 0.600 ppb
20150.178 ppb92ND - 1.000 ppb
20160.867 ppb124ND - 5.00 ppb
2017ND90ND

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
2012-09-110.500 ppb
2012-09-11ND
2012-09-110.600 ppb
2012-09-11ND
2012-12-040.700 ppb
2012-12-040.700 ppb
2012-12-04ND
2012-12-040.600 ppb
2013-06-240.700 ppb
2013-06-240.900 ppb
2013-06-24ND
2013-06-24ND
2013-08-271.20 ppb
2013-08-272.70 ppb
2013-08-271.30 ppb
2013-08-271.80 ppb
2013-11-05ND
2013-11-05ND
2013-11-05ND
2013-11-05ND
2013-11-06ND
2013-11-06ND
2013-11-06ND
2013-11-06ND
2013-12-17ND
2013-12-17ND
2013-12-17ND
2013-12-17ND
2014-02-27ND
2014-02-27ND
2014-03-18ND
2014-03-18ND
2014-06-17ND
2014-06-170.600 ppb
2014-09-17ND
2014-09-17ND
2014-12-11ND
2014-12-11ND
2015-03-10ND
2015-03-10ND
2015-06-11ND
2015-06-11ND
2015-06-110.600 ppb
2015-09-23ND
2015-09-23ND
2015-12-091.000 ppb
2015-12-09ND
2016-01-22ND
2016-02-03ND
2016-02-10ND
2016-03-02ND
2016-03-02ND
2016-06-220.800 ppb
2016-06-220.500 ppb
2016-09-014.10 ppb
2016-09-01ND
2016-09-13ND
2016-11-095.00 ppb
2016-11-09ND
2017-03-08ND
2017-03-08ND
2017-03-30ND
2017-05-12ND
2017-05-12ND
2017-07-20ND
2017-07-20ND
2017-10-18ND
2017-10-18ND