Know Your Environment. Protect Your Health.

Chloroform

Bull Run Mountain/evergreen (brme)

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20190.700 ppb110.700 ppb
20200.700 ppb110.700 ppb
2021ND60ND
20220.150 ppb61ND - 0.900 ppb
20230.125 ppb61ND - 0.750 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
2019-10-28WB-7-1910V0.700 ppb
2020-02-24WB-7-2002V0.700 ppb
2021-04-2721042610-01VND
2021-04-2721042610-02VND
2021-04-2721042610-03VND
2021-04-2721042610-04VND
2021-04-2721042610-05VND
2021-04-2721042610-06VND
2022-07-2622-12667 VOCND
2022-07-2622-12670 VOCND
2022-07-2622-12669 VOCND
2022-07-2622-12668 VOC0.900 ppb
2022-09-2922092907-01-VOCND
2022-12-1322-21032 VOCND
2023-10-2423102311-01_VOCND
2023-10-2423102311-02_VOC0.750 ppb
2023-10-2423102311-03_VOCND
2023-10-2423102311-04_VOCND
2023-10-2423102311-05_VOCND
2023-10-2423102311-06_VOCND