Know Your Environment. Protect Your Health.

Chloroform

Harris County Municipal Utility District 5

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.

 

57

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND90ND
20190.144 ppb91ND - 1.30 ppb
20200.233 ppb91ND - 2.10 ppb
20211.58 ppb92ND - 13.0 ppb
20221.13 ppb102ND - 5.90 ppb
2023ND110ND

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
2018-02-06AE12481ND
2018-02-06AE12476ND
2018-05-02AE24794ND
2018-05-02AE24843ND
2018-05-02AE24772ND
2018-09-12AE39788ND
2018-09-12AE39789ND
2018-11-26AE46811ND
2018-11-26AE46812ND
2019-02-06AE53171ND
2019-02-06AE53173ND
2019-02-06AE53204ND
2019-04-29AE63920ND
2019-04-29AE63933ND
2019-08-15AE78899ND
2019-08-15AE78868ND
2019-12-04AE91218ND
2019-12-04AE912191.30 ppb
2020-02-21AE99488ND
2020-02-21AE99503ND
2020-02-21AE99549ND
2020-05-20AF12101ND
2020-05-20AF12104ND
2020-08-19AF245462.10 ppb
2020-08-19AF24564ND
2020-10-22AF31655ND
2020-10-22AF31656ND
2021-02-02AF4223613.0 ppb
2021-02-02AF421381.20 ppb
2021-02-02AF42136ND
2021-06-18AF58799ND
2021-06-18AF58804ND
2021-08-12AF66047ND
2021-08-12AF66049ND
2021-10-28AF75038ND
2021-10-28AF75039ND
2022-02-15AF848665.90 ppb
2022-02-15AF848685.40 ppb
2022-04-25AF94216ND
2022-04-25AF94217ND
2022-09-16AG13475ND
2022-09-16AG13478ND
2022-09-16AG13632ND
2022-11-30AG20270ND
2022-11-30AG20307ND
2022-11-30AG20271ND
2023-02-13AG28581ND
2023-02-13AG28583ND
2023-02-13AG28599ND
2023-05-09AG39709ND
2023-05-09AG39710ND
2023-05-09AG39751ND
2023-07-24AG49767ND
2023-07-24AG49768ND
2023-08-22AG53541ND
2023-11-15AG63724ND
2023-11-15AG63725ND