Know Your Environment. Protect Your Health.

Chloroform

Arlington Waterworks

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)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.720 ppb32ND - 1.20 ppb
2019ND20ND
20200.387 ppb32ND - 0.740 ppb
20210.918 ppb42ND - 2.80 ppb
20221.60 ppb221.000 ppb - 2.20 ppb
20230.378 ppb52ND - 1.10 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
2018-05-17122505ND
2018-09-061739180.960 ppb
2018-09-201812791.20 ppb
2019-09-05323815ND
2019-09-12326853ND
2020-06-25438508ND
2020-09-304806310.420 ppb
2020-09-304806320.740 ppb
2021-05-121253528ND
2021-05-121253528ND
2021-09-0910474040.870 ppb
2021-09-0910474032.80 ppb
2022-09-1512353011.000 ppb
2022-09-1512353002.20 ppb
2023-04-191314808ND
2023-08-101358937ND
2023-09-2013753110.790 ppb
2023-09-2013753081.10 ppb
2023-10-111383167ND