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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Rosamond CSD

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

 

72

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.16 ppb184ND - 7.20 ppb
20151.12 ppb194ND - 7.40 ppb
20162.01 ppb164ND - 13.6 ppb
2017N/A00N/A
20180.345 ppb111ND - 3.80 ppb
2019ND80ND

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
2014-03-113761-019-1045ND
2014-03-113761-021-10153.60 ppb
2014-03-113761-022-1000ND
2014-03-113761-020-1035ND
2014-06-103761-021-09505.80 ppb
2014-06-103761-022-0935ND
2014-06-103761-020-0915ND
2014-06-103761-019-0925ND
2014-09-093761-022-0955ND
2014-09-093761-020-1025ND
2014-09-093761-020-1030ND
2014-09-093761-019-1035ND
2014-09-093761-022-1000ND
2014-09-093761-021-10107.20 ppb
2014-12-093761-019-1100ND
2014-12-093761-020-1050ND
2014-12-093761-022-1020ND
2014-12-093761-021-10304.20 ppb
2015-03-103761-021-10202.90 ppb
2015-03-103761-022-1010ND
2015-03-103761-019-1100ND
2015-03-103761-020-1030ND
2015-06-093761-020-1030ND
2015-06-093761-022-1005ND
2015-06-093761-019-1040ND
2015-06-093761-021-10203.80 ppb
2015-07-213761-006-0910ND
2015-07-213761-002-1054ND
2015-07-283761-009-1040ND
2015-09-083761-021-10107.20 ppb
2015-09-083761-022-0955ND
2015-09-083761-019-1030ND
2015-09-083761-020-1020ND
2015-12-083761-021-10557.40 ppb
2015-12-083761-019-1115ND
2015-12-083761-020-1105ND
2015-12-083761-022-1045ND
2016-03-083761-021-092511.6 ppb
2016-03-083761-020-0915ND
2016-03-083761-019-0925ND
2016-03-083761-022-0940ND
2016-06-143761-019-1035ND
2016-06-143761-022-1055ND
2016-06-143761-021-110513.6 ppb
2016-06-143761-020-1045ND
2016-09-133761-021-10355.30 ppb
2016-09-133761-019-1015ND
2016-09-133761-022-1025ND
2016-09-133761-020-1005ND
2016-12-063761-019-0835ND
2016-12-063761-022-0805ND
2016-12-063761-021-08151.70 ppb
2016-12-063761-020-0825ND
2018-03-133761-022-1030ND
2018-03-133761-019-1040ND
2018-05-223761-002-0900ND
2018-05-223761-006-1045ND
2018-05-223761-009-0935ND
2018-06-123761-022-1040ND
2018-06-123761-019-10503.80 ppb
2018-09-113761-019-1040ND
2018-09-113761-022-1050ND
2018-12-113761-019-1110ND
2018-12-113761-022-1100ND
2019-03-123761-019-1100ND
2019-03-123761-022-1050ND
2019-06-113761-019-1105ND
2019-06-113761-022-1050ND
2019-10-013761-019-1100ND
2019-10-013761-022-1050ND
2019-12-103761-019-1000ND
2019-12-103761-022-1025ND