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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

La Habra Heights County Water District

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.

 

33

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
20140.511 ppb92ND - 3.20 ppb
2015ND60ND
20161.02 ppb63ND - 3.20 ppb
20170.733 ppb62ND - 3.10 ppb

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
2012-03-292706-009-0855ND
2012-04-172706-010-1335ND
2012-08-132706-005-1045ND
2013-01-222706-009-1115ND
2013-04-252706-010-1055ND
2013-07-162706-005-1340ND
2014-01-089588-009-0929ND
2014-03-253761-800-1027ND
2014-03-253761-801-1018ND
2014-04-119588-010-0930ND
2014-06-053761-800-14341.40 ppb
2014-06-053761-801-1421ND
2014-07-229588-005-0950ND
2014-08-143761-800-09353.20 ppb
2014-08-143761-801-0945ND
2015-03-049588-009-0928ND
2015-04-109588-010-0920ND
2015-07-289588-005-0947ND
2015-08-143761-800-1045ND
2015-08-143761-801-1055ND
2015-09-169588-006-1010ND
2016-03-219588-009-0940ND
2016-07-139588-005-0907ND
2016-07-139588-010-0840ND
2016-07-139588-006-08571.60 ppb
2016-08-093761-801-09401.30 ppb
2016-08-093761-800-09523.20 ppb
2017-01-179588-009-0925ND
2017-07-199588-010-0900ND
2017-07-199588-006-09341.30 ppb
2017-07-199588-005-0915ND
2017-08-083761-801-1300ND
2017-08-083761-800-12503.10 ppb