Know Your Environment. Protect Your Health.

Chloroform

The Oaks 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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

20

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.08 ppb53ND - 7.40 ppb
20192.72 ppb53ND - 5.50 ppb
20203.74 ppb75ND - 9.70 ppb
20213.03 ppb43ND - 8.80 ppb
20222.58 ppb53ND - 6.10 ppb
20231.54 ppb53ND - 4.50 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
2018-07-31AE350765.10 ppb
2018-07-31AE35090ND
2018-07-31AE350922.90 ppb
2018-07-31AE35100ND
2018-07-31AE350717.40 ppb
2019-04-25AE63750ND
2019-04-25AE63752ND
2019-04-25AE637543.70 ppb
2019-04-25AE637565.50 ppb
2019-08-27AE810154.40 ppb
2020-03-23AF040453.50 ppb
2020-03-23AF040572.20 ppb
2020-03-23AF04063ND
2020-03-23AF04065ND
2020-05-18AF116504.80 ppb
2020-05-18AF115896.00 ppb
2020-08-20AF245899.70 ppb
2021-02-24AF441992.30 ppb
2021-02-24AF442031.000 ppb
2021-02-24AF44205ND
2021-06-14AF577708.80 ppb
2022-08-01AG070643.70 ppb
2022-08-01AG07089ND
2022-08-01AG07105ND
2022-08-01AG071073.10 ppb
2022-08-01AG071096.10 ppb
2023-08-30AG546644.50 ppb
2023-10-10AG591511.60 ppb
2023-10-10AG591531.60 ppb
2023-10-10AG59155ND
2023-10-10AG59157ND