Know Your Environment. Protect Your Health.

Chloroform

City Of Glen Rose

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.

 

75

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20188.86 ppb12121.62 ppb - 22.0 ppb
201912.0 ppb12121.45 ppb - 49.8 ppb
20207.69 ppb127ND - 30.5 ppb
20213.32 ppb148ND - 22.9 ppb
20221.90 ppb125ND - 14.2 ppb
20231.22 ppb134ND - 8.42 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
2018-02-15Q18066070024.71 ppb
2018-02-15Q18066070011.76 ppb
2018-04-26Q18171290021.94 ppb
2018-04-26Q18171290012.58 ppb
2018-08-08Q183171700213.2 ppb
2018-08-08Q183171700313.2 ppb
2018-08-08Q183171700922.0 ppb
2018-08-08Q183171701212.5 ppb
2018-08-08Q183171701310.9 ppb
2018-08-08Q183171701916.7 ppb
2018-10-31Q18437250011.62 ppb
2018-10-31Q18437250025.23 ppb
2019-02-13Q19066320016.20 ppb
2019-02-13Q19066320024.83 ppb
2019-05-01Q191751502213.2 ppb
2019-05-01Q19175150144.26 ppb
2019-05-01Q191751501233.5 ppb
2019-05-01Q191751500910.2 ppb
2019-05-01Q19175150015.97 ppb
2019-05-01Q19175150113.52 ppb
2019-08-13Q19544820021.45 ppb
2019-08-13Q19544820038.82 ppb
2019-11-05Q19750610012.68 ppb
2019-11-05Q197506100249.8 ppb
2020-02-27Q2007409001ND
2020-02-27Q20074090023.88 ppb
2020-06-02Q202172400217.2 ppb
2020-06-02Q2021724001ND
2020-09-21Q2037371003ND
2020-09-21Q2037371009ND
2020-09-21Q2037371010ND
2020-11-24Q20468900115.22 ppb
2020-11-24Q20468900131.41 ppb
2020-11-24Q204689001730.5 ppb
2020-11-24Q204689001919.9 ppb
2020-11-24Q204689002014.2 ppb
2021-03-17Q21069840081.21 ppb
2021-03-17Q210698400715.2 ppb
2021-06-01Q2114022005ND
2021-06-01Q21140220211.65 ppb
2021-06-01Q21140220201.23 ppb
2021-06-01Q211402201322.9 ppb
2021-06-01Q2114022011ND
2021-06-01Q2114022009ND
2021-06-01Q2114022007ND
2021-09-01Q21237870071.86 ppb
2021-09-01Q2123787011ND
2021-09-01Q21237870121.10 ppb
2021-12-02Q2133430002ND
2021-12-02Q21334300031.36 ppb
2022-02-22Q22062420061.62 ppb
2022-02-22Q22062420071.34 ppb
2022-02-22Q220624200814.2 ppb
2022-02-22Q2206242010ND
2022-05-09Q2213793001ND
2022-05-09Q22137930021.37 ppb
2022-08-01Q22219030014.23 ppb
2022-08-01Q2221903002ND
2022-11-03Q2233476009ND
2022-11-03Q2233476013ND
2022-11-03Q2233476017ND
2022-11-03Q2233476018ND
2023-01-11Q2301770002ND
2023-01-11Q23017700071.32 ppb
2023-01-11Q2301770008ND
2023-04-05Q23126450041.06 ppb
2023-04-05Q2312645006ND
2023-04-05Q2312645003ND
2023-07-10Q2326570002ND
2023-07-10Q2326570003ND
2023-10-11Q2343453004ND
2023-10-11Q2343453006ND
2023-10-11Q23434530265.01 ppb
2023-10-11Q23434530278.42 ppb
2023-10-11Q2343453030ND