Know Your Environment. Protect Your Health.

Chloroform

Wolcott Water Department

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.

 

49

Samples

0

Samples exceeding legal limit (MCL)

49

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201849.0 ppb8825.0 ppb - 71.0 ppb
201949.8 ppb8840.0 ppb - 64.0 ppb
202048.7 ppb7734.0 ppb - 67.0 ppb
202155.2 ppb8832.4 ppb - 99.7 ppb
202246.1 ppb101034.0 ppb - 58.0 ppb
202351.8 ppb8835.0 ppb - 71.0 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
2018-01-09100069GE 137.0 ppb
2018-01-09100068GE 125.0 ppb
2018-04-05101561GE 150.0 ppb
2018-04-05101560GE 136.0 ppb
2018-07-05103839GE 154.0 ppb
2018-07-05103840GE 148.0 ppb
2018-10-10106344GE 171.0 ppb
2018-10-23106688GE 171.0 ppb
2019-01-04108166GE 143.0 ppb
2019-01-04108167GE 140.0 ppb
2019-04-04109987GE 141.0 ppb
2019-04-04109986PPS47.0 ppb
2019-07-09112158PPS55.0 ppb
2019-07-09112157PPS59.0 ppb
2019-10-03114044PPS49.0 ppb
2019-10-21114434PPS64.0 ppb
2020-01-07115756PPS42.0 ppb
2020-01-07115757PPS34.0 ppb
2020-04-07117651PPS48.2 ppb
2020-04-07117652PPS67.0 ppb
2020-07-07119515PPS38.0 ppb
2020-10-02121620PPS47.2 ppb
2020-10-02121621PPS64.7 ppb
2021-01-05A123501PPS44.0 ppb
2021-01-05A123500PPS34.0 ppb
2021-04-05125320PPS32.4 ppb
2021-04-05125321PPS42.8 ppb
2021-07-02127276PPS69.9 ppb
2021-07-21127711PPS99.7 ppb
2021-10-29129799PPS55.0 ppb
2021-10-29129800PPS64.0 ppb
2022-01-06130960PPS39.0 ppb
2022-01-06130961PPS51.0 ppb
2022-04-04132679PPS43.0 ppb
2022-04-04132680PPS52.0 ppb
2022-07-01134516PPS58.0 ppb
2022-07-01134515PPS54.0 ppb
2022-10-20Z136826PPS48.0 ppb
2022-10-20Z136827PPS34.0 ppb
2022-10-20136826PPS48.0 ppb
2022-10-20136827PPS34.0 ppb
2023-01-06138071PPS45.0 ppb
2023-01-06138072PPS46.0 ppb
2023-04-03139671ZPPS35.0 ppb
2023-04-03139672ZPPS42.0 ppb
2023-07-06141520PPS49.0 ppb
2023-07-06141521PPS66.0 ppb
2023-10-02A143262PPS60.0 ppb
2023-10-23143651PPS71.0 ppb