Know Your Environment. Protect Your Health.

Chloroform

Sundance Addition

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.292 ppb51ND - 1.46 ppb
2019ND50ND
2020ND50ND
20210.234 ppb51ND - 1.17 ppb
20220.242 ppb51ND - 1.21 ppb
20234.29 ppb52ND - 13.5 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-27Q1812580018ND
2018-03-27Q18125800201.46 ppb
2018-03-27Q1812580009ND
2018-06-19Q1824313001ND
2018-06-19Q1824313002ND
2019-09-09Q1962975001ND
2019-09-09Q1962975003ND
2019-09-09Q1962975005ND
2019-09-09Q1962975014ND
2019-09-09Q1962975015ND
2020-07-22Q2028870001ND
2020-07-22Q2028870003ND
2020-07-22Q2028870009ND
2020-07-22Q2028870012ND
2020-07-22Q2028870013ND
2021-09-09Q2124628001ND
2021-09-09Q2124628002ND
2021-12-09Q2134714007ND
2021-12-09Q2134714009ND
2021-12-09Q21347140111.17 ppb
2022-09-26Q2228779001ND
2022-09-26Q2228779002ND
2022-10-21Q2232010003ND
2022-10-21Q2232010005ND
2022-10-21Q22320100071.21 ppb
2023-03-20Q2310440001ND
2023-03-20Q2310440003ND
2023-03-20Q2310440005ND
2023-05-18Q231878100113.5 ppb
2023-05-18Q23187810027.96 ppb