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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

San Fernando Water Department

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.

MORE ABOUT THIS CONTAMINANT

 

116

Samples

0

Samples exceeding legal limit (MCL)

64

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.858 ppb199ND - 3.30 ppb
20151.31 ppb1912ND - 4.70 ppb
20161.42 ppb1912ND - 6.80 ppb
20171.38 ppb2114ND - 5.60 ppb
20180.865 ppb209ND - 3.80 ppb
20190.928 ppb188ND - 3.60 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
2014-01-159590-800-10201.80 ppb
2014-01-159590-801-1035ND
2014-01-159590-802-0940ND
2014-01-159590-803-1000ND
2014-01-229590-002-0905ND
2014-01-229590-003-0950ND
2014-01-229590-004-0840ND
2014-04-309590-800-10202.60 ppb
2014-04-309590-801-10401.20 ppb
2014-04-309590-802-0940ND
2014-04-309590-803-10001.10 ppb
2014-07-119590-800-10502.90 ppb
2014-07-119590-801-1115ND
2014-07-119590-802-1010ND
2014-07-119590-803-10301.10 ppb
2014-10-079590-800-10153.30 ppb
2014-10-079590-801-10451.10 ppb
2014-10-079590-802-0930ND
2014-10-079590-803-10001.20 ppb
2015-01-219590-002-0820ND
2015-01-219590-003-1015ND
2015-01-219590-004-0905ND
2015-01-219590-800-11101.90 ppb
2015-01-219590-801-11301.20 ppb
2015-01-219590-802-1030ND
2015-01-219590-803-10501.10 ppb
2015-05-139590-800-10203.60 ppb
2015-05-139590-801-10351.20 ppb
2015-05-139590-802-0940ND
2015-05-139590-803-10001.20 ppb
2015-08-129590-800-10504.60 ppb
2015-08-129590-801-11101.70 ppb
2015-08-129590-802-1000ND
2015-08-129590-803-10251.30 ppb
2015-10-299590-800-10104.70 ppb
2015-10-299590-801-10301.20 ppb
2015-10-299590-802-0930ND
2015-10-299590-803-09551.20 ppb
2016-02-179590-002-0920ND
2016-02-179590-004-0900ND
2016-02-249590-800-10401.70 ppb
2016-02-249590-801-11101.10 ppb
2016-02-249590-802-0940ND
2016-02-249590-803-1010ND
2016-04-139590-004-0820ND
2016-04-209590-800-10002.90 ppb
2016-04-209590-801-10161.000 ppb
2016-04-209590-802-0918ND
2016-04-209590-803-09371.000 ppb
2016-07-159590-800-10406.80 ppb
2016-07-159590-801-11051.70 ppb
2016-07-159590-802-09551.20 ppb
2016-07-159590-803-10201.60 ppb
2016-10-139590-800-10155.30 ppb
2016-10-139590-801-08151.40 ppb
2016-10-139590-802-0845ND
2016-10-139590-803-10401.20 ppb
2017-01-139590-800-10151.80 ppb
2017-01-139590-801-10451.20 ppb
2017-01-139590-802-0920ND
2017-01-139590-803-09451.20 ppb
2017-01-259590-002-0715ND
2017-01-259590-003-0855ND
2017-01-259590-004-0800ND
2017-04-059590-004-0920ND
2017-04-129590-800-10154.10 ppb
2017-04-129590-801-10501.30 ppb
2017-04-129590-802-09301.000 ppb
2017-04-129590-803-09551.40 ppb
2017-07-129590-800-11005.00 ppb
2017-07-129590-801-11201.20 ppb
2017-07-129590-802-1012ND
2017-07-129590-803-10351.30 ppb
2017-10-119590-800-10505.60 ppb
2017-10-119590-801-11101.30 ppb
2017-10-119590-802-10001.20 ppb
2017-10-119590-803-10201.40 ppb
2017-10-249590-004-0715ND
2018-01-179590-800-10201.90 ppb
2018-01-179590-801-10401.10 ppb
2018-01-179590-802-1110ND
2018-01-179590-803-10001.000 ppb
2018-01-249590-002-0900ND
2018-01-249590-004-1055ND
2018-04-189590-800-10453.80 ppb
2018-04-189590-801-11051.20 ppb
2018-04-189590-802-0950ND
2018-04-189590-803-10151.10 ppb
2018-06-069590-004-0905ND
2018-07-119590-004-0855ND
2018-07-179590-800-10103.30 ppb
2018-07-179590-801-1035ND
2018-07-179590-802-0920ND
2018-07-179590-803-0955ND
2018-10-179590-800-1228ND
2018-10-179590-801-12481.10 ppb
2018-10-179590-802-11182.80 ppb
2018-10-179590-803-1157ND
2019-01-119590-002-0900ND
2019-01-119590-004-0925ND
2019-01-169590-800-08451.50 ppb
2019-01-169590-801-0825ND
2019-01-169590-802-0920ND
2019-01-169590-803-0900ND
2019-04-189590-800-10452.50 ppb
2019-04-189590-801-11001.000 ppb
2019-04-189590-802-0955ND
2019-04-189590-803-1020ND
2019-08-159590-800-10403.20 ppb
2019-08-159590-801-1100ND
2019-08-159590-802-0955ND
2019-08-159590-803-1020ND
2019-10-159590-800-10003.60 ppb
2019-10-159590-801-10451.80 ppb
2019-10-159590-802-09001.60 ppb
2019-10-159590-803-09301.50 ppb