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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Whittier 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

 

181

Samples

0

Samples exceeding legal limit (MCL)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.162 ppb341ND - 5.50 ppb
20150.106 ppb333ND - 1.30 ppb
20160.454 ppb289ND - 3.00 ppb
20170.321 ppb339ND - 1.40 ppb
20180.294 ppb317ND - 1.50 ppb
20190.927 ppb2214ND - 1.80 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
2014-01-079588-022-1000ND
2014-01-249588-800-1245ND
2014-01-249588-801-1200ND
2014-01-249588-802-1210ND
2014-01-249588-803-1230ND
2014-02-119588-022-0830ND
2014-03-119588-022-1100ND
2014-04-099588-022-1000ND
2014-04-299588-800-1120ND
2014-04-299588-801-1040ND
2014-04-299588-802-1055ND
2014-04-299588-803-1105ND
2014-05-209588-022-0830ND
2014-05-289588-003-0900ND
2014-05-289588-009-1000ND
2014-06-109588-022-1000ND
2014-06-119588-008-09105.50 ppb
2014-06-119588-010-0920ND
2014-06-119588-011-0950ND
2014-07-089588-022-0900ND
2014-07-319588-800-1435ND
2014-07-319588-801-1455ND
2014-07-319588-802-1510ND
2014-07-319588-803-1535ND
2014-08-079588-022-1000ND
2014-09-049588-013-1000ND
2014-09-179588-022-0900ND
2014-10-169588-022-0930ND
2014-10-309588-800-1110ND
2014-10-309588-801-1030ND
2014-10-309588-802-1040ND
2014-10-309588-803-1055ND
2014-11-109588-022-0830ND
2014-12-179588-022-0900ND
2015-01-149588-022-0830ND
2015-01-279588-800-1025ND
2015-01-279588-801-0950ND
2015-01-279588-802-1000ND
2015-01-279588-803-1010ND
2015-02-099588-022-1000ND
2015-03-109588-022-0800ND
2015-04-159588-022-0820ND
2015-04-279588-800-10051.30 ppb
2015-04-279588-801-0930ND
2015-04-279588-802-0940ND
2015-04-279588-803-09551.10 ppb
2015-05-069588-022-0830ND
2015-05-199588-009-0800ND
2015-06-109588-008-0950ND
2015-06-109588-010-1010ND
2015-06-109588-011-1000ND
2015-06-249588-022-0930ND
2015-07-149588-022-0800ND
2015-07-309588-800-10351.10 ppb
2015-07-309588-801-0955ND
2015-07-309588-802-1005ND
2015-07-309588-803-1020ND
2015-08-119588-022-0850ND
2015-09-109588-013-0930ND
2015-09-169588-022-1000ND
2015-10-199588-022-0800ND
2015-10-279588-800-1020ND
2015-10-279588-801-0950ND
2015-10-279588-802-1000ND
2015-10-279588-803-1010ND
2015-11-109588-022-0830ND
2015-12-029588-022-0900ND
2016-01-139588-022-0930ND
2016-01-279588-800-1010ND
2016-01-279588-801-09351.000 ppb
2016-01-279588-802-0945ND
2016-01-279588-803-09551.20 ppb
2016-02-099588-022-0800ND
2016-03-089588-022-1117ND
2016-04-269588-800-10501.10 ppb
2016-04-269588-801-1015ND
2016-04-269588-802-1025ND
2016-04-269588-803-10351.30 ppb
2016-05-119588-009-0845ND
2016-06-149588-008-0920ND
2016-06-149588-010-0925ND
2016-06-149588-011-0930ND
2016-07-279588-800-1135ND
2016-07-279588-801-1055ND
2016-07-279588-802-1105ND
2016-07-279588-803-11201.000 ppb
2016-09-139588-013-0935ND
2016-09-209588-022-1000ND
2016-10-109588-022-0905ND
2016-10-279588-800-11053.00 ppb
2016-10-279588-801-10401.20 ppb
2016-10-279588-802-10501.30 ppb
2016-10-279588-803-10551.60 ppb
2016-11-219588-022-0942ND
2016-12-069588-022-0830ND
2017-01-249588-022-1236ND
2017-01-269588-800-10201.20 ppb
2017-01-269588-801-09451.10 ppb
2017-01-269588-802-09551.20 ppb
2017-01-269588-803-10051.40 ppb
2017-02-149588-022-1040ND
2017-03-139588-022-0945ND
2017-04-119588-022-1038ND
2017-04-269588-800-10151.10 ppb
2017-04-269588-801-0940ND
2017-04-269588-802-09501.10 ppb
2017-04-269588-803-10001.30 ppb
2017-05-019588-022-0845ND
2017-05-099588-009-0842ND
2017-06-069588-022-0730ND
2017-06-149588-008-0910ND
2017-06-149588-010-0905ND
2017-06-149588-011-0955ND
2017-07-179588-022-0820ND
2017-07-269588-800-1150ND
2017-07-269588-801-1130ND
2017-07-269588-802-1055ND
2017-07-269588-803-11151.20 ppb
2017-08-159588-022-0740ND
2017-09-129588-013-0925ND
2017-09-189588-022-0822ND
2017-10-169588-022-0811ND
2017-10-269588-800-10251.000 ppb
2017-10-269588-801-0950ND
2017-10-269588-802-1000ND
2017-10-269588-803-1010ND
2017-11-069588-022-0750ND
2017-12-059588-022-0807ND
2018-01-229588-022-0752ND
2018-01-299588-800-0950ND
2018-01-299588-801-0940ND
2018-01-299588-802-0930ND
2018-01-299588-803-09201.000 ppb
2018-02-209588-022-0953ND
2018-03-199588-022-0815ND
2018-04-099588-022-0928ND
2018-04-269588-800-09351.50 ppb
2018-04-269588-801-0920ND
2018-04-269588-802-09101.50 ppb
2018-04-269588-803-09001.50 ppb
2018-06-139588-008-0905ND
2018-06-139588-009-0955ND
2018-06-139588-010-0915ND
2018-06-139588-011-0855ND
2018-07-109588-022-0900ND
2018-07-239588-022-1130ND
2018-07-269588-800-1000ND
2018-07-269588-801-0945ND
2018-07-269588-802-0935ND
2018-07-269588-803-09251.20 ppb
2018-08-079588-022-1000ND
2018-09-189588-013-1115ND
2018-09-249588-022-0838ND
2018-10-159588-022-0924ND
2018-10-259588-800-10451.20 ppb
2018-10-259588-801-1035ND
2018-10-259588-802-1020ND
2018-10-259588-803-10101.20 ppb
2018-11-059588-022-0836ND
2019-01-289588-800-09301.70 ppb
2019-01-289588-801-09201.20 ppb
2019-01-289588-802-09101.60 ppb
2019-01-289588-803-08551.70 ppb
2019-04-269588-800-10301.70 ppb
2019-04-269588-801-10001.30 ppb
2019-04-269588-802-10101.30 ppb
2019-04-269588-803-10201.80 ppb
2019-05-089588-009-0810ND
2019-06-119588-008-0900ND
2019-06-119588-009-0950ND
2019-06-119588-010-0845ND
2019-06-119588-011-0905ND
2019-07-269588-800-10401.20 ppb
2019-07-269588-801-0955ND
2019-07-269588-802-1005ND
2019-07-269588-803-10201.20 ppb
2019-09-249588-013-1055ND
2019-10-289588-800-10451.50 ppb
2019-10-289588-801-10001.10 ppb
2019-10-289588-802-10151.40 ppb
2019-10-289588-803-10301.70 ppb