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EWG's Tap Water Database — 2019 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.

 

113

Samples

0

Samples exceeding legal limit (MCL)

61

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.613 ppb167ND - 2.00 ppb
20130.484 ppb197ND - 2.00 ppb
20140.858 ppb199ND - 3.30 ppb
20151.31 ppb1912ND - 4.70 ppb
20161.42 ppb1912ND - 6.80 ppb
20171.38 ppb2114ND - 5.60 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
2012-01-189590-002-1035ND
2012-01-189590-003-1000ND
2012-01-189590-004-0920ND
2012-04-069590-800-10351.20 ppb
2012-04-069590-801-1020ND
2012-04-069590-802-0950ND
2012-04-069590-803-1055ND
2012-07-189590-800-10102.00 ppb
2012-07-189590-801-09501.20 ppb
2012-07-189590-802-09251.30 ppb
2012-07-189590-803-10301.000 ppb
2012-09-109590-004-0910ND
2012-10-249590-800-10551.90 ppb
2012-10-249590-801-11151.20 ppb
2012-10-249590-802-0950ND
2012-10-249590-803-1030ND
2013-01-099590-002-0940ND
2013-01-099590-003-0915ND
2013-01-099590-004-0830ND
2013-01-169590-800-10301.10 ppb
2013-01-169590-801-1100ND
2013-01-169590-802-0950ND
2013-01-169590-803-1015ND
2013-04-249590-800-08351.40 ppb
2013-04-249590-801-0815ND
2013-04-249590-802-0750ND
2013-04-249590-803-0900ND
2013-07-179590-800-10052.00 ppb
2013-07-179590-801-10301.20 ppb
2013-07-179590-802-0920ND
2013-07-179590-803-09451.000 ppb
2013-10-169590-800-10271.50 ppb
2013-10-169590-801-10451.000 ppb
2013-10-169590-802-0945ND
2013-10-169590-803-1010ND
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