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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Palm Ranch Irrigation District

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

 

59

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND80ND
2016ND160ND
20172.26 ppb81ND - 18.1 ppb
2018ND80ND
20192.00 ppb112ND - 11.2 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
2014-03-043761-800-0835ND
2014-03-043761-800-0905ND
2014-06-103761-801-0930ND
2014-06-103761-800-0950ND
2014-09-023761-801-0900ND
2014-09-023761-800-0930ND
2014-12-023761-801-0850ND
2014-12-023761-800-0920ND
2015-03-033761-801-0905ND
2015-03-033761-800-0925ND
2015-06-093761-800-1010ND
2015-06-093761-801-1025ND
2015-09-013761-800-0955ND
2015-09-013761-801-1022ND
2015-12-013761-800-0925ND
2015-12-013761-801-0945ND
2016-03-013761-800-0940ND
2016-03-013761-801-0918ND
2016-06-143761-800-0718ND
2016-06-143761-801-0746ND
2016-07-193761-013-0854ND
2016-07-193761-007-0838ND
2016-07-193761-002-0852ND
2016-07-193761-001-0819ND
2016-08-303761-001-0700ND
2016-08-303761-002-0805ND
2016-08-303761-004-0720ND
2016-08-303761-007-0740ND
2016-09-063761-800-0711ND
2016-09-063761-801-0750ND
2016-12-063761-800-0704ND
2016-12-063761-801-0735ND
2017-03-073761-800-115118.1 ppb
2017-03-073761-801-1206ND
2017-06-133761-800-0829ND
2017-06-133761-801-0800ND
2017-09-053761-800-0754ND
2017-09-053761-801-0720ND
2017-12-053761-800-0958ND
2017-12-053761-801-0915ND
2018-03-063761-800-0930ND
2018-03-063761-801-0856ND
2018-06-123761-800-0753ND
2018-06-123761-801-0718ND
2018-09-043761-801-0826ND
2018-09-043761-800-0855ND
2018-12-043761-800-0907ND
2018-12-043761-801-0849ND
2019-03-053761-801-073611.2 ppb
2019-03-053761-800-080510.8 ppb
2019-05-283761-001-0850ND
2019-06-043761-002-0635ND
2019-06-113761-801-0746ND
2019-06-113761-007-0636ND
2019-06-113761-800-0820ND
2019-09-033761-801-0701ND
2019-09-033761-800-0717ND
2019-12-033761-801-0832ND
2019-12-033761-800-0857ND