Know Your Environment. Protect Your Health.

Chloroform

Chimney Hill Municipal Utility District

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.

 

52

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.24 ppb92ND - 15.7 ppb
20193.58 ppb92ND - 17.5 ppb
202013.0 ppb97ND - 25.0 ppb
202113.3 ppb97ND - 28.5 ppb
202214.7 ppb7710.9 ppb - 18.0 ppb
202316.5 ppb98ND - 25.8 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
2018-02-05AE1217513.5 ppb
2018-02-05AE1216515.7 ppb
2018-04-17AE22758ND
2018-04-17AE22797ND
2018-04-17AE22755ND
2018-08-22AE38075ND
2018-08-22AE38076ND
2018-12-04AE47769ND
2018-12-04AE47773ND
2019-02-13AE54293ND
2019-02-13AE54294ND
2019-02-13AE54369ND
2019-05-22AE67615ND
2019-05-22AE67616ND
2019-09-24AE84619ND
2019-09-24AE84620ND
2019-12-03AE9100414.7 ppb
2019-12-03AE9100517.5 ppb
2020-02-06AE97305ND
2020-02-06AE97306ND
2020-04-29AF0868624.5 ppb
2020-04-29AF0868725.0 ppb
2020-04-29AF0872120.0 ppb
2020-09-16AF2752810.7 ppb
2020-09-16AF2753017.1 ppb
2020-10-29AF326038.90 ppb
2020-10-29AF3259810.8 ppb
2021-02-09AF4324316.1 ppb
2021-02-09AF4324514.5 ppb
2021-02-09AF4327715.0 ppb
2021-04-20AF50713ND
2021-04-20AF50714ND
2021-08-11AF6585828.5 ppb
2021-08-11AF6586025.9 ppb
2021-11-12AF7658916.0 ppb
2021-11-12AF765914.00 ppb
2022-02-14AF8455016.4 ppb
2022-02-14AF8455513.7 ppb
2022-02-14AF8462618.0 ppb
2022-05-19AF9769114.5 ppb
2022-05-19AF9769316.1 ppb
2022-07-29AG0703813.5 ppb
2022-07-29AG0703910.9 ppb
2023-02-02AG2714117.7 ppb
2023-02-02AG2715019.4 ppb
2023-04-27AG3839625.8 ppb
2023-04-27AG3839723.0 ppb
2023-04-27AG3846221.0 ppb
2023-08-24AG5395121.6 ppb
2023-08-24AG5395619.0 ppb
2023-10-05AG585871.20 ppb
2023-10-05AG58592ND