Know Your Environment. Protect Your Health.

Chloroform

Rio Brazos 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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.490 ppb31ND - 1.47 ppb
20190.350 ppb31ND - 1.05 ppb
2020ND30ND
2021ND40ND
2022ND40ND
20230.852 ppb64ND - 1.74 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
2018-09-24Q1838018007ND
2018-09-24Q1838018008ND
2018-09-24Q18380180051.47 ppb
2019-09-23Q1967408003ND
2019-09-23Q1967408007ND
2019-09-23Q19674080081.05 ppb
2020-08-03Q2030183001ND
2020-08-03Q2030183003ND
2020-08-03Q2030183011ND
2021-03-31Q2108168006ND
2021-03-31Q2108168008ND
2021-06-03Q2114423001ND
2021-06-03Q2114423002ND
2022-09-27Q2229032001ND
2022-09-27Q2229032002ND
2022-11-30Q2235879002ND
2022-11-30Q2235879004ND
2023-06-08Q2321728001ND
2023-06-08Q23217280091.74 ppb
2023-06-08Q2321728010ND
2023-06-08Q23217280111.19 ppb
2023-08-17Q23347020011.02 ppb
2023-12-15Q23540440011.16 ppb