Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Bel-di-gil Water System

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

 

100

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND200ND
2015ND160ND
20161.20 ppb164ND - 5.30 ppb
20170.300 ppb162ND - 2.40 ppb
2018ND160ND
2019ND160ND

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
2014-02-17L0039849-02ND
2014-02-17L0039849-01ND
2014-02-17L0039849-02ND
2014-02-17L0039849-01ND
2014-03-24AD90022ND
2014-03-24AD90023ND
2014-03-24AD90023ND
2014-03-24AD90022ND
2014-04-14L0041967-01ND
2014-04-14L0041967-02ND
2014-04-14L0041967-02ND
2014-04-14L0041967-01ND
2014-06-11L0044248-01ND
2014-06-11L0044248-02ND
2014-06-11L0044248-02ND
2014-06-11L0044248-01ND
2014-10-14L0049350-01ND
2014-10-14L0049350-02ND
2014-10-14L0049350-02ND
2014-10-14L0049350-01ND
2015-01-21L0053346-01ND
2015-01-21L0053346-02ND
2015-01-21L0053346-02ND
2015-01-21L0053346-01ND
2015-04-21LA6100-2ND
2015-04-21LA6100-1ND
2015-04-21LA6100-2ND
2015-04-21LA6100-1ND
2015-07-08LA9146-1ND
2015-07-08LA9146-2ND
2015-07-08LA9146-2ND
2015-07-08LA9146-1ND
2015-11-05LA13717-1ND
2015-11-05LA13717-2ND
2015-11-05LA13717-2ND
2015-11-05LA13717-1ND
2016-01-19LA16268-1ND
2016-01-19LA16268-1ND
2016-01-19LA16268-2ND
2016-01-19LA16268-2ND
2016-04-26LA19893-1ND
2016-04-26LA19893-1ND
2016-04-26LA19893-2ND
2016-04-26LA19893-2ND
2016-07-11LA22901-1ND
2016-07-11LA22901-2ND
2016-07-11LA22901-1ND
2016-07-11LA22901-2ND
2016-10-24LA26915-24.30 ppb
2016-10-24LA26915-15.30 ppb
2016-10-24LA26915-24.30 ppb
2016-10-24LA26915-15.30 ppb
2017-01-2035290204014ND
2017-01-2035290204013ND
2017-01-2035290204014ND
2017-01-2035290204013ND
2017-04-0635305184016ND
2017-04-0635305184016ND
2017-04-0635305184015ND
2017-04-0635305184015ND
2017-07-1335324317010ND
2017-07-1335324317009ND
2017-07-1335324317010ND
2017-07-1335324317009ND
2017-10-20353434260012.40 ppb
2017-10-2035343426002ND
2017-10-20353434260012.40 ppb
2017-10-2035343426002ND
2018-01-1935369364002ND
2018-01-1935369364002ND
2018-01-1935369364001ND
2018-01-1935369364001ND
2018-04-0535384640001ND
2018-04-0535384640002ND
2018-04-0535384640001ND
2018-04-0535384640002ND
2018-07-2335407043002ND
2018-07-2335407043001ND
2018-07-2335407043001ND
2018-07-2335407043002ND
2018-10-2235426521001ND
2018-10-2235426521002ND
2018-10-2235426521001ND
2018-10-2235426521002ND
2019-01-1635443223002ND
2019-01-1635443223001ND
2019-01-1635443223001ND
2019-01-1635443223002ND
2019-04-1035461530002ND
2019-04-1035461530002ND
2019-04-1035461530001ND
2019-04-1035461530001ND
2019-07-1035481745002ND
2019-07-1035481745001ND
2019-07-1035481745001ND
2019-07-1035481745002ND
2019-10-0335502847001ND
2019-10-0335502847002ND
2019-10-0335502847001ND
2019-10-0335502847002ND