Know Your Environment. Protect Your Health.

Chloroform

Westside Rural Water Supply Corporation

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)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.236 ppb51ND - 1.18 ppb
20190.200 ppb51ND - 1.000 ppb
2020ND50ND
20210.512 ppb52ND - 1.33 ppb
20221.02 ppb51ND - 5.09 ppb
20230.494 ppb51ND - 2.47 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
2018-09-12Q1836540001ND
2018-10-30Q1843596002ND
2018-10-30Q18435960031.18 ppb
2018-10-30Q1843596006ND
2018-10-30Q1843596007ND
2019-05-07Q1920849008ND
2019-05-07Q1920849017ND
2019-05-07Q1920849006ND
2019-05-07Q19208490041.000 ppb
2019-05-07Q1920849002ND
2020-01-23Q2002763003ND
2020-01-23Q2002763005ND
2020-01-23Q2002763007ND
2020-01-23Q2002763009ND
2020-09-22Q2037540001ND
2021-01-25Q21016990101.23 ppb
2021-01-25Q2101699016ND
2021-01-25Q2101699014ND
2021-01-25Q21016990121.33 ppb
2021-09-14Q2125002001ND
2022-09-29Q22293300015.09 ppb
2022-11-10Q2233973002ND
2022-11-10Q2233973004ND
2022-11-10Q2233973006ND
2022-11-10Q2233973008ND
2023-03-20Q2310439002ND
2023-06-21Q2323858001ND
2023-06-21Q2323858003ND
2023-06-21Q2323858005ND
2023-06-21Q23238580132.47 ppb