Know Your Environment. Protect Your Health.

Chloroform

Harris County Municipal Utility District 96

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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.91 ppb82ND - 12.1 ppb
20192.78 ppb82ND - 11.2 ppb
20200.933 ppb62ND - 2.90 ppb
202110.5 ppb84ND - 38.7 ppb
20220.575 ppb83ND - 1.70 ppb
20232.91 ppb86ND - 5.70 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
2018-02-02AE12220ND
2018-02-02AE12171ND
2018-05-03AE25017ND
2018-05-03AE25013ND
2018-08-07AE35945ND
2018-08-07AE35955ND
2018-10-17AE4376011.2 ppb
2018-10-17AE4376312.1 ppb
2019-02-22AE5562711.2 ppb
2019-02-22AE5562811.0 ppb
2019-05-21AE67357ND
2019-05-21AE67360ND
2019-09-05AE82241ND
2019-09-05AE82268ND
2019-10-23AE87357ND
2019-10-23AE87358ND
2020-02-27AF003712.70 ppb
2020-02-27AF003752.90 ppb
2020-05-04AF09097ND
2020-05-04AF09101ND
2020-08-11AF22812ND
2020-08-11AF22813ND
2021-02-08AF42950ND
2021-02-08AF42947ND
2021-05-25AF5532538.7 ppb
2021-05-25AF5532638.2 ppb
2021-09-15AF69959ND
2021-09-15AF69960ND
2021-11-08AF760053.90 ppb
2021-11-08AF760093.20 ppb
2022-02-16AF85218ND
2022-03-07AF877561.50 ppb
2022-04-18AF93493ND
2022-04-18AF93497ND
2022-08-18AG09986ND
2022-08-18AG09987ND
2022-12-15AG219301.70 ppb
2022-12-15AG219311.40 ppb
2023-03-21AG337674.00 ppb
2023-03-21AG337693.90 ppb
2023-05-25AG420884.50 ppb
2023-05-25AG420925.70 ppb
2023-08-21AG53285ND
2023-08-21AG53288ND
2023-12-08AG660902.50 ppb
2023-12-08AG660912.70 ppb