Know Your Environment. Protect Your Health.

Chloroform

City of Aledo

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.473 ppb41ND - 1.89 ppb
20190.645 ppb41ND - 2.58 ppb
20201.64 ppb54ND - 2.39 ppb
20210.760 ppb52ND - 1.94 ppb
20222.46 ppb63ND - 8.35 ppb
20234.01 ppb53ND - 11.4 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
2018-08-01Q1830485003ND
2018-08-01Q1830485005ND
2018-08-01Q18304850151.89 ppb
2018-08-01Q1830485002ND
2019-08-14Q19551700082.58 ppb
2019-08-14Q1955170009ND
2019-08-14Q1955170011ND
2019-08-14Q1955170013ND
2020-05-06Q20178130172.39 ppb
2020-05-06Q20178130182.01 ppb
2020-05-06Q20178130221.60 ppb
2020-05-06Q2017813024ND
2020-05-06Q20178130262.21 ppb
2021-05-17Q21126320051.94 ppb
2021-05-17Q2112632014ND
2021-05-17Q2112632012ND
2021-05-17Q2112632010ND
2021-05-17Q21126320041.86 ppb
2022-05-31Q22155460014.05 ppb
2022-05-31Q2215546002ND
2022-09-29Q2229352002ND
2022-09-29Q22293520058.35 ppb
2022-11-21Q2234952004ND
2022-11-21Q22349520062.37 ppb
2023-02-06Q23043840051.21 ppb
2023-07-12Q2327353003ND
2023-07-12Q2327353005ND
2023-07-12Q23273530187.42 ppb
2023-07-12Q232735301911.4 ppb