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Chloroform

Darbonne Ws North

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.

MORE ABOUT THIS CONTAMINANT

 

66

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.169 ppb186ND - 0.580 ppb
20190.0588 ppb162ND - 0.470 ppb
20200.0450 ppb81ND - 0.360 ppb
20210.0550 ppb81ND - 0.440 ppb
20220.0563 ppb81ND - 0.450 ppb
20230.214 ppb83ND - 0.590 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
2018-02-26353765980030.510 ppb
2018-02-2635376598001ND
2018-02-26353765980020.430 ppb
2018-02-26353765980030.510 ppb
2018-02-26353765980020.430 ppb
2018-02-2635376598001ND
2018-05-29353952120020.580 ppb
2018-05-2935395212001ND
2018-05-29353952120020.580 ppb
2018-05-2935395212001ND
2018-08-1635412063001ND
2018-08-1635412063002ND
2018-08-1635412063002ND
2018-08-1635412063001ND
2018-11-1935432389001ND
2018-11-1935432389002ND
2018-11-1935432389002ND
2018-11-1935432389001ND
2019-02-25354509640020.470 ppb
2019-02-25354509640020.470 ppb
2019-02-2535450964001ND
2019-02-2535450964001ND
2019-05-2035470222001ND
2019-05-2035470222002ND
2019-05-2035470222001ND
2019-05-2035470222002ND
2019-08-1935492404002ND
2019-08-1935492404001ND
2019-08-1935492404001ND
2019-08-1935492404002ND
2019-11-1935514075002ND
2019-11-1935514075001ND
2019-11-1935514075001ND
2019-11-1935514075002ND
2020-02-1835532449001ND
2020-02-1835532449002ND
2020-05-2035551963001ND
2020-05-20355519630020.360 ppb
2020-08-1735572268001ND
2020-08-1735572268002ND
2020-11-0935591925001ND
2020-11-0935591925002ND
2021-03-2335621297001ND
2021-03-2335621297002ND
2021-05-17356349840010.440 ppb
2021-05-1735634984002ND
2021-08-1235655892002ND
2021-08-1235655892001ND
2021-11-2935680829002ND
2021-11-2935680829001ND
2022-02-1435698271001ND
2022-02-1435698271002ND
2022-05-0935718281001ND
2022-05-0935718281002ND
2022-08-0835739540002ND
2022-08-08357395400010.450 ppb
2022-11-0735758854002ND
2022-11-0735758854001ND
2023-02-13357806970010.590 ppb
2023-02-1335780697002ND
2023-05-08357996230010.530 ppb
2023-05-0835799623002ND
2023-08-07358202480010.590 ppb
2023-08-0735820248002ND
2023-11-1335842433001ND
2023-11-1335842433002ND