Know Your Environment. Protect Your Health.

Chloroform

White River Municipal Water District

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.75 ppb65ND - 9.15 ppb
20198.70 ppb65ND - 34.8 ppb
202015.4 ppb65ND - 40.5 ppb
20214.68 ppb63ND - 12.7 ppb
20224.02 ppb63ND - 11.7 ppb
20233.62 ppb63ND - 8.52 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
2018-02-06Q18046130059.15 ppb
2018-04-24Q1816513004ND
2018-04-24Q18165130084.54 ppb
2018-07-17Q18282340014.96 ppb
2018-07-17Q18282340024.66 ppb
2018-11-14Q18462370015.21 ppb
2019-02-12Q19062010093.60 ppb
2019-05-01Q191759000234.8 ppb
2019-05-01Q1917590004ND
2019-08-06Q19514220036.14 ppb
2019-08-06Q19514220014.29 ppb
2019-10-09Q19720680013.38 ppb
2020-03-09Q20084670032.35 ppb
2020-05-19Q20198860012.95 ppb
2020-09-15Q203651600533.6 ppb
2020-09-15Q203651600640.5 ppb
2020-09-15Q2036516008ND
2020-11-16Q204496000113.2 ppb
2021-02-23Q2104538005ND
2021-04-29Q2110925001ND
2021-08-11Q212142200411.1 ppb
2021-08-11Q2121422005ND
2021-08-11Q212142200712.7 ppb
2021-12-02Q21333430014.26 ppb
2022-03-14Q22085630092.53 ppb
2022-06-01Q2215568001ND
2022-06-02Q2215628001ND
2022-09-06Q22263310019.87 ppb
2022-09-06Q222633100311.7 ppb
2022-12-08Q2236959001ND
2023-02-09Q2305226005ND
2023-04-27Q2315856001ND
2023-08-17Q2334682003ND
2023-08-17Q23346820058.52 ppb
2023-08-17Q23346820085.63 ppb
2023-10-11Q23434280017.57 ppb