Know Your Environment. Protect Your Health.

Chloroform

Selah City Of

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.215 ppb21ND - 0.430 ppb
20190.288 ppb42ND - 0.650 ppb
2020N/A00N/A
2021ND20ND
20220.267 ppb32ND - 0.490 ppb
20230.268 ppb52ND - 0.680 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
2018-07-120.430 ppb
2018-07-12ND
2019-07-230.650 ppb
2019-07-23ND
2019-07-250.500 ppb
2019-07-25ND
2021-07-144149164ND
2021-07-144149165ND
2022-07-114325406ND
2022-07-1943195010.310 ppb
2022-07-1943195030.490 ppb
2023-03-284436986ND
2023-03-284436987ND
2023-03-284443033ND
2023-07-1844988570.680 ppb
2023-07-1844988590.660 ppb