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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Newhall CWD-Newhall

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.

 

136

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.688 ppb167ND - 3.20 ppb
20130.0625 ppb241ND - 1.50 ppb
2014ND230ND
2015ND240ND
2016ND240ND
20170.888 ppb258ND - 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
2012-02-099590-006-1037ND
2012-02-099590-007-1017ND
2012-04-129590-006-0830ND
2012-04-129590-007-1150ND
2012-07-129590-006-1012ND
2012-07-129590-007-0950ND
2012-07-129590-800-12051.30 ppb
2012-07-129590-801-11001.60 ppb
2012-07-129590-802-1130ND
2012-07-129590-803-12201.30 ppb
2012-10-119590-006-1100ND
2012-10-119590-007-1109ND
2012-10-119590-800-09481.10 ppb
2012-10-119590-801-10283.20 ppb
2012-10-119590-802-10091.30 ppb
2012-10-119590-803-09351.20 ppb
2013-01-109590-006-0925ND
2013-01-109590-007-0940ND
2013-01-109590-800-1155ND
2013-01-109590-801-10351.50 ppb
2013-01-109590-802-1110ND
2013-01-109590-803-1220ND
2013-04-119590-006-0841ND
2013-04-119590-007-0901ND
2013-04-119590-800-1050ND
2013-04-119590-801-1120ND
2013-04-119590-802-0944ND
2013-04-119590-803-1015ND
2013-07-119590-006-0912ND
2013-07-119590-007-0925ND
2013-07-119590-800-1035ND
2013-07-119590-801-0850ND
2013-07-119590-802-0830ND
2013-07-119590-803-1020ND
2013-10-109590-006-1140ND
2013-10-109590-007-1205ND
2013-10-109590-800-1300ND
2013-10-109590-801-1230ND
2013-10-109590-802-1400ND
2013-10-109590-803-1330ND
2014-01-169590-007-1105ND
2014-01-169590-800-1155ND
2014-01-169590-801-0900ND
2014-01-169590-802-0930ND
2014-01-169590-803-1130ND
2014-04-109590-007-0936ND
2014-04-109590-800-1054ND
2014-04-109590-801-0851ND
2014-04-109590-802-1007ND
2014-04-109590-803-1042ND
2014-05-299590-006-0955ND
2014-07-179590-006-0825ND
2014-07-179590-007-0850ND
2014-07-179590-801-0945ND
2014-07-179590-802-1020ND
2014-07-179590-803-1055ND
2014-07-219590-800-1045ND
2014-10-139590-006-1005ND
2014-10-139590-007-1037ND
2014-10-169590-800-1405ND
2014-10-169590-801-1450ND
2014-10-169590-802-1305ND
2014-10-169590-803-1345ND
2015-01-159590-006-1023ND
2015-01-159590-007-0925ND
2015-01-159590-800-1140ND
2015-01-159590-801-1040ND
2015-01-159590-802-1100ND
2015-01-159590-803-1130ND
2015-04-239590-006-1100ND
2015-04-239590-007-1118ND
2015-04-239590-800-1425ND
2015-04-239590-801-1145ND
2015-04-239590-802-1310ND
2015-04-239590-803-1400ND
2015-07-169590-006-0910ND
2015-07-169590-007-0925ND
2015-07-169590-800-1320ND
2015-07-169590-801-1055ND
2015-07-169590-802-1120ND
2015-07-169590-803-1335ND
2015-10-159590-006-0920ND
2015-10-159590-007-0930ND
2015-10-159590-800-0855ND
2015-10-159590-801-0820ND
2015-10-159590-802-0800ND
2015-10-159590-803-0845ND
2016-01-079590-006-0855ND
2016-01-079590-007-0930ND
2016-01-149590-800-1130ND
2016-01-149590-801-0920ND
2016-01-149590-802-1035ND
2016-01-149590-803-1100ND
2016-04-079590-800-1025ND
2016-04-079590-801-1120ND
2016-04-079590-802-1145ND
2016-04-079590-803-1050ND
2016-04-149590-006-1115ND
2016-04-149590-007-1055ND
2016-07-219590-006-0858ND
2016-07-219590-007-0815ND
2016-07-219590-800-1338ND
2016-07-219590-801-0923ND
2016-07-219590-802-0945ND
2016-07-219590-803-1325ND
2016-10-069590-006-1045ND
2016-10-069590-007-1115ND
2016-10-069590-800-0915ND
2016-10-069590-801-0840ND
2016-10-069590-802-1015ND
2016-10-069590-803-0948ND
2017-01-129590-006-0855ND
2017-01-199590-800-1000ND
2017-01-199590-801-0850ND
2017-01-199590-802-08252.50 ppb
2017-01-199590-803-0935ND
2017-02-239590-007-1155ND
2017-04-139590-006-0930ND
2017-04-139590-006-0940ND
2017-04-139590-007-0900ND
2017-04-139590-007-0911ND
2017-04-139590-800-1430ND
2017-04-139590-801-1100ND
2017-04-139590-802-1120ND
2017-04-139590-803-1420ND
2017-07-139590-006-0840ND
2017-07-139590-007-1000ND
2017-07-139590-800-10452.40 ppb
2017-07-139590-801-09351.10 ppb
2017-07-139590-802-0905ND
2017-07-139590-803-10252.20 ppb
2017-10-199590-007-0945ND
2017-10-199590-800-12403.60 ppb
2017-10-199590-801-11053.50 ppb
2017-10-199590-802-11453.30 ppb
2017-10-199590-803-13063.60 ppb