Know Your Environment. Protect Your Health.

Chloroform

Felsenthal Water and Sewer

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)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.57 ppb65ND - 8.29 ppb
20190.584 ppb53ND - 1.10 ppb
20200.497 ppb62ND - 1.83 ppb
20210.192 ppb62ND - 0.620 ppb
2022ND60ND
20231.38 ppb221.31 ppb - 1.45 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
2018-02-27180600031014.44 ppb
2018-05-0118123006001ND
2018-06-18181720008025.60 ppb
2018-06-18181720009024.90 ppb
2018-07-10181930068014.19 ppb
2018-10-24182980002018.29 ppb
2019-02-1819052004601ND
2019-07-15191980021010.820 ppb
2019-09-09192540026021.000 ppb
2019-09-09192540027021.10 ppb
2019-10-2819303001701ND
2020-01-28200300052071.15 ppb
2020-06-1620170004001ND
2020-07-20202040012011.83 ppb
2020-09-2920275002401ND
2020-09-2920275002301ND
2020-11-1720324002901ND
2021-01-27210280151010.530 ppb
2021-04-2121111000301ND
2021-08-30212450002010.620 ppb
2021-09-0821252002502ND
2021-09-0821252002402ND
2021-10-2621301005501ND
2022-03-02O195908-VOC-1ND
2022-05-24O198513-VOC-1ND
2022-07-26O200115-VOC-1ND
2022-09-06O201414-THM-1ND
2022-09-06O201413-THM-1ND
2022-10-24O203229-VOC-1ND
2023-09-06O211809-THM-11.45 ppb
2023-09-06O211810-THM-11.31 ppb