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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Bellflower Municipal 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

 

55

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND90ND
2015ND100ND
2016ND90ND
2017ND90ND
2018ND90ND
2019ND90ND

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
2014-01-283761-801-0645ND
2014-01-283761-800-0655ND
2014-04-223761-801-0620ND
2014-04-223761-800-0635ND
2014-05-289588-028-1030ND
2014-07-153761-801-0558ND
2014-07-153761-800-0615ND
2014-10-143761-801-0723ND
2014-10-143761-800-0658ND
2015-01-133761-800-0645ND
2015-01-133761-801-0716ND
2015-04-143761-801-0920ND
2015-04-143761-800-0930ND
2015-07-143761-800-0820ND
2015-07-143761-801-0833ND
2015-09-249588-028-1049ND
2015-10-193761-800-1619ND
2015-10-193761-801-1635ND
2015-10-279588-028-1030ND
2016-01-139588-028-1050ND
2016-01-193761-800-0818ND
2016-01-193761-801-0831ND
2016-04-123761-801-1011ND
2016-04-123761-800-0948ND
2016-07-193761-800-0925ND
2016-07-193761-801-0932ND
2016-10-183761-801-1047ND
2016-10-183761-800-1040ND
2017-01-173761-800-0948ND
2017-01-173761-801-1005ND
2017-01-259588-028-1005ND
2017-04-113761-800-0950ND
2017-04-113761-801-1013ND
2017-07-183761-801-1005ND
2017-07-183761-800-0946ND
2017-10-033761-801-0952ND
2017-10-033761-800-0946ND
2018-01-083761-801-0855ND
2018-01-083761-800-0753ND
2018-01-099588-028-1100ND
2018-04-103761-800-0732ND
2018-04-103761-801-0814ND
2018-07-103761-801-0956ND
2018-07-103761-800-0945ND
2018-10-093761-801-1000ND
2018-10-093761-800-0944ND
2019-01-083761-801-1017ND
2019-01-083761-800-1005ND
2019-01-169588-028-1120ND
2019-04-093761-801-0827ND
2019-04-093761-800-0717ND
2019-07-093761-801-0957ND
2019-07-093761-800-0930ND
2019-10-083761-801-1010ND
2019-10-083761-800-0940ND