Know Your Environment. Protect Your Health.

Chloroform

City of Shallowater

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND20ND
2021ND40ND
20222.26 ppb62ND - 7.83 ppb
2023ND30ND

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
2018-07-11Q1827381004ND
2018-07-11Q1827381001ND
2019-07-10Q1943529002ND
2019-07-10Q1943529005ND
2020-07-29Q2029645003ND
2020-07-29Q2029645004ND
2021-07-06Q2117573001ND
2021-08-11Q2121480006ND
2021-10-20Q2129605006ND
2021-10-20Q2129605004ND
2022-03-15Q2208766004ND
2022-06-16Q2216858002ND
2022-06-16Q22168580047.83 ppb
2022-06-16Q22168580125.75 ppb
2022-08-16Q2224095001ND
2022-10-25Q2232134001ND
2023-04-25Q2315528008ND
2023-04-25Q2315528010ND
2023-08-09Q2332882001ND