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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Pico Rivera 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

 

153

Samples

0

Samples exceeding legal limit (MCL)

77

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.144 ppb253ND - 1.30 ppb
20150.483 ppb299ND - 2.00 ppb
20161.10 ppb2718ND - 3.30 ppb
20171.50 ppb2519ND - 5.70 ppb
20181.32 ppb2313ND - 5.70 ppb
20191.78 ppb2415ND - 11.3 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
2014-01-063761-800-0930ND
2014-01-063761-801-0910ND
2014-01-063761-802-0815ND
2014-01-063761-803-0740ND
2014-01-219588-002-1000ND
2014-01-239588-006-0920ND
2014-01-309588-012-1020ND
2014-04-013761-800-1030ND
2014-04-013761-801-1010ND
2014-04-013761-802-0920ND
2014-04-013761-803-0830ND
2014-04-239588-002-0950ND
2014-04-239588-008-1035ND
2014-04-249588-007-09391.20 ppb
2014-04-249588-012-1029ND
2014-07-073761-800-0920ND
2014-07-073761-801-0855ND
2014-07-073761-802-0755ND
2014-07-073761-803-0720ND
2014-09-169588-002-1002ND
2014-09-169588-004-11051.30 ppb
2014-09-169588-005-1119ND
2014-12-179588-002-0954ND
2014-12-189588-009-10241.10 ppb
2014-12-189588-012-1050ND
2015-01-133761-800-09302.00 ppb
2015-01-133761-801-09051.10 ppb
2015-01-133761-802-0800ND
2015-01-133761-803-0710ND
2015-02-269588-002-1006ND
2015-02-269588-006-0958ND
2015-03-059588-012-0906ND
2015-04-143761-800-09301.60 ppb
2015-04-143761-801-09051.50 ppb
2015-04-143761-802-0755ND
2015-04-143761-803-07101.10 ppb
2015-04-159588-002-0941ND
2015-04-159588-007-1028ND
2015-04-159588-008-1017ND
2015-04-299588-012-0940ND
2015-07-073761-800-09351.70 ppb
2015-07-073761-801-09101.70 ppb
2015-07-073761-802-0750ND
2015-07-073761-803-0700ND
2015-07-279588-002-0949ND
2015-07-279588-004-1145ND
2015-07-279588-005-1120ND
2015-07-289588-012-1109ND
2015-10-063761-800-09151.60 ppb
2015-10-063761-801-0850ND
2015-10-063761-802-0745ND
2015-10-063761-803-0700ND
2015-10-149588-009-09171.70 ppb
2015-10-149588-012-1033ND
2016-01-053761-800-09352.00 ppb
2016-01-053761-801-09151.70 ppb
2016-01-053761-802-08051.10 ppb
2016-01-053761-803-07201.30 ppb
2016-03-229588-006-0901ND
2016-03-249588-012-0940ND
2016-04-053761-800-09352.30 ppb
2016-04-053761-801-09151.90 ppb
2016-04-053761-802-08101.20 ppb
2016-04-053761-803-07301.60 ppb
2016-05-099588-007-1015ND
2016-05-099588-008-1000ND
2016-05-099588-012-1115ND
2016-07-053761-800-09102.10 ppb
2016-07-053761-801-08501.60 ppb
2016-07-053761-802-07451.000 ppb
2016-07-053761-803-07001.90 ppb
2016-07-219588-002-0844ND
2016-07-219588-004-10151.10 ppb
2016-07-219588-005-0950ND
2016-07-219588-012-1105ND
2016-10-043761-800-09201.80 ppb
2016-10-043761-801-09001.40 ppb
2016-10-043761-802-07551.10 ppb
2016-10-043761-803-07101.20 ppb
2016-11-099588-009-11443.30 ppb
2016-11-099588-012-0943ND
2017-01-103761-800-09502.00 ppb
2017-01-103761-801-09202.00 ppb
2017-01-103761-802-0810ND
2017-01-103761-803-0725ND
2017-02-099588-006-1105ND
2017-02-099588-012-0945ND
2017-04-043761-800-09302.40 ppb
2017-04-043761-801-09051.70 ppb
2017-04-043761-802-08101.000 ppb
2017-04-043761-803-07201.10 ppb
2017-04-249588-007-10251.10 ppb
2017-04-249588-008-1015ND
2017-07-113761-800-09102.10 ppb
2017-07-113761-801-08451.40 ppb
2017-07-113761-802-07351.30 ppb
2017-07-113761-803-06551.30 ppb
2017-07-259588-002-0937ND
2017-07-259588-004-10464.40 ppb
2017-07-259588-005-10272.00 ppb
2017-10-033761-800-09152.60 ppb
2017-10-033761-801-08501.30 ppb
2017-10-033761-802-07401.000 ppb
2017-10-033761-803-06551.10 ppb
2017-10-109588-004-11205.70 ppb
2017-10-109588-009-10452.10 ppb
2018-01-023761-800-08354.80 ppb
2018-01-023761-801-08152.10 ppb
2018-01-023761-802-07201.000 ppb
2018-01-023761-803-06401.10 ppb
2018-01-159588-006-0923ND
2018-04-033761-800-09102.40 ppb
2018-04-033761-801-08451.000 ppb
2018-04-033761-802-0750ND
2018-04-033761-803-07051.000 ppb
2018-04-179588-007-1010ND
2018-04-179588-008-1035ND
2018-07-033761-800-0910ND
2018-07-033761-801-08455.70 ppb
2018-07-033761-802-0740ND
2018-07-033761-803-06551.10 ppb
2018-07-269588-002-0919ND
2018-07-269588-004-11003.70 ppb
2018-07-269588-005-10401.90 ppb
2018-10-093761-800-09252.60 ppb
2018-10-093761-801-0900ND
2018-10-093761-802-0755ND
2018-10-093761-803-0710ND
2018-10-199588-009-10302.00 ppb
2019-01-023761-800-09152.10 ppb
2019-01-023761-801-08551.90 ppb
2019-01-023761-802-0745ND
2019-01-023761-803-06501.000 ppb
2019-01-309588-006-0900ND
2019-04-023761-800-09152.90 ppb
2019-04-023761-801-08551.10 ppb
2019-04-023761-802-0755ND
2019-04-023761-803-07101.10 ppb
2019-05-099588-008-0915ND
2019-05-239588-007-0920ND
2019-07-023761-800-09052.40 ppb
2019-07-023761-801-08456.60 ppb
2019-07-023761-802-0735ND
2019-07-023761-803-0645ND
2019-08-089588-002-0905ND
2019-08-089588-004-10453.10 ppb
2019-08-089588-005-10351.40 ppb
2019-10-013761-800-09053.20 ppb
2019-10-013761-801-084511.3 ppb
2019-10-013761-802-07401.000 ppb
2019-10-013761-803-07001.000 ppb
2019-11-259588-002-0840ND
2019-11-259588-009-11402.50 ppb