Know Your Environment. Protect Your Health.

Chloroform

Ashcreek 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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.10 ppb21ND - 2.19 ppb
20191.05 ppb32ND - 2.11 ppb
2020ND20ND
2021ND20ND
2022ND30ND
20233.89 ppb21ND - 7.78 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
2018-02-13Q1805886001ND
2018-02-13Q18058860042.19 ppb
2019-08-12Q19540050011.04 ppb
2019-08-12Q1954005003ND
2019-08-12Q19540050072.11 ppb
2020-02-12Q2005777005ND
2020-02-12Q2005777007ND
2021-07-08Q2117906006ND
2021-07-08Q2117906008ND
2022-09-29Q2229353001ND
2022-09-29Q2229353003ND
2022-09-29Q2229353008ND
2023-12-04Q2351639001ND
2023-12-04Q23516390037.78 ppb