Know Your Environment. Protect Your Health.

Chloroform

City of Hearne

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)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.840 ppb53ND - 1.80 ppb
20190.520 ppb51ND - 2.60 ppb
20200.320 ppb51ND - 1.60 ppb
20212.42 ppb53ND - 9.90 ppb
2022ND50ND
20230.280 ppb51ND - 1.40 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
2018-06-21AE30999ND
2018-06-21AE310011.80 ppb
2018-06-21AE310051.30 ppb
2018-06-21AE31007ND
2018-06-21AE309761.10 ppb
2019-05-16AE66832ND
2019-05-16AE668692.60 ppb
2019-05-16AE66871ND
2019-05-16AE66873ND
2019-05-16AE66875ND
2020-04-23AF078701.60 ppb
2020-06-30AF17368ND
2020-06-30AF17373ND
2020-06-30AF17375ND
2020-06-30AF17377ND
2021-06-08AF569471.000 ppb
2021-06-08AF569571.20 ppb
2021-06-08AF569659.90 ppb
2021-06-08AF56967ND
2021-06-15AF58067ND
2022-06-22AG01927ND
2022-06-22AG01932ND
2022-06-22AG01934ND
2022-06-22AG01936ND
2022-06-22AG01938ND
2023-06-13AG44230ND
2023-06-13AG44232ND
2023-06-13AG442341.40 ppb
2023-07-27AG50390ND
2023-07-27AG50404ND