Know Your Environment. Protect Your Health.

Chloroform

Concan 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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.29 ppb85ND - 8.50 ppb
20192.35 ppb85ND - 6.10 ppb
20201.41 ppb84ND - 4.60 ppb
20213.23 ppb85ND - 15.1 ppb
20221.40 ppb87ND - 2.10 ppb
20233.53 ppb86ND - 15.3 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
2018-01-25AE105582.70 ppb
2018-01-25AE105363.10 ppb
2018-04-16AE22551ND
2018-04-16AE225003.00 ppb
2018-08-09AE363421.000 ppb
2018-08-09AE36398ND
2018-12-13AE488278.50 ppb
2018-12-13AE48838ND
2019-02-28AE565514.40 ppb
2019-02-28AE56584ND
2019-02-28AE56588ND
2019-02-28AE565923.30 ppb
2019-05-14AE661956.10 ppb
2019-08-26AE805873.20 ppb
2019-08-26AE80657ND
2019-10-22AE872261.80 ppb
2020-02-20AE992684.60 ppb
2020-06-24AF167692.00 ppb
2020-08-12AF231811.20 ppb
2020-08-12AF23217ND
2020-08-12AF23219ND
2020-08-12AF23221ND
2020-08-12AF23223ND
2020-11-23AF354873.50 ppb
2021-03-22AF476642.20 ppb
2021-05-19AF54642ND
2021-05-19AF54644ND
2021-05-19AF5458215.1 ppb
2021-09-22AF708013.70 ppb
2021-09-22AF70823ND
2021-09-22AF708252.80 ppb
2021-12-22AF792612.00 ppb
2022-03-08AF880342.10 ppb
2022-03-08AF880821.80 ppb
2022-06-08AF999971.70 ppb
2022-08-16AG09478ND
2022-08-16AG094821.50 ppb
2022-08-16AG094801.000 ppb
2022-08-16AG094422.10 ppb
2022-12-27AG228471.000 ppb
2023-02-24AG304264.90 ppb
2023-06-08AG4375015.3 ppb
2023-08-24AG539982.40 ppb
2023-08-24AG54024ND
2023-11-06AG623741.40 ppb
2023-11-06AG623791.10 ppb
2023-11-06AG623813.10 ppb
2023-11-06AG62383ND