Know Your Environment. Protect Your Health.

Chloroform

Cross Timbers 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.

 

77

Samples

0

Samples exceeding legal limit (MCL)

30

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.02 ppb136ND - 3.10 ppb
20191.59 ppb137ND - 3.87 ppb
20201.15 ppb135ND - 4.12 ppb
20210.622 ppb134ND - 3.17 ppb
20221.000 ppb135ND - 4.63 ppb
20230.848 ppb123ND - 5.35 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
2018-01-11Q1801616004ND
2018-01-11Q1801616001ND
2018-01-11Q18016160102.47 ppb
2018-01-11Q18016160092.44 ppb
2018-04-11Q1815188001ND
2018-04-11Q18151880042.23 ppb
2018-04-11Q1815188006ND
2018-04-11Q1815188009ND
2018-07-16Q1828198001ND
2018-07-16Q18281980021.37 ppb
2018-10-09Q18404520013.10 ppb
2018-10-09Q1840452002ND
2018-12-05Q18496360031.68 ppb
2019-03-07Q1909909002ND
2019-03-07Q19099090063.87 ppb
2019-03-07Q19099090072.32 ppb
2019-03-07Q19099090113.73 ppb
2019-06-05Q19323060152.37 ppb
2019-06-05Q1932306014ND
2019-06-05Q1932306003ND
2019-06-05Q1932306001ND
2019-06-05Q1932306005ND
2019-09-10Q1963524001ND
2019-09-10Q19635240023.82 ppb
2019-12-18Q19808040011.79 ppb
2019-12-18Q19808040022.75 ppb
2020-03-09Q20084470013.64 ppb
2020-03-09Q20084470024.12 ppb
2020-05-18Q2019652009ND
2020-05-18Q20196520101.35 ppb
2020-05-18Q2019652003ND
2020-08-25Q2034098001ND
2020-08-25Q20340980023.70 ppb
2020-10-12Q2039719010ND
2020-10-12Q2039719012ND
2020-10-12Q20397190142.20 ppb
2020-10-12Q2039719029ND
2020-10-12Q2039719030ND
2020-12-01Q2048173001ND
2021-03-16Q21067690022.09 ppb
2021-03-16Q2106769001ND
2021-06-03Q2114352002ND
2021-06-03Q2114352001ND
2021-08-30Q2123513007ND
2021-08-30Q21235130083.17 ppb
2021-08-30Q2123513009ND
2021-08-30Q2123513011ND
2021-08-30Q2123513013ND
2021-08-30Q21235130151.73 ppb
2021-11-08Q2131371005ND
2021-11-08Q21313710061.10 ppb
2021-11-08Q2131371002ND
2022-02-17Q2205965004ND
2022-02-17Q22059650061.98 ppb
2022-02-17Q22059650102.09 ppb
2022-02-17Q22059650111.87 ppb
2022-05-02Q2212894002ND
2022-05-02Q22128940032.43 ppb
2022-08-22Q2224966001ND
2022-08-22Q2224966002ND
2022-11-29Q2235312002ND
2022-11-29Q2235312004ND
2022-11-29Q2235312006ND
2022-11-29Q2235312014ND
2022-11-29Q22353120154.63 ppb
2023-03-02Q23084880203.07 ppb
2023-03-02Q2308488019ND
2023-03-02Q2308488006ND
2023-03-02Q23084880045.35 ppb
2023-06-19Q2323082002ND
2023-06-19Q2323082003ND
2023-09-20Q2340862002ND
2023-09-20Q23408620031.75 ppb
2023-11-27Q2350411005ND
2023-11-27Q2350411007ND
2023-11-27Q2350411018ND
2023-11-27Q2350411019ND