Know Your Environment. Protect Your Health.

Chloroform

New Lisbon Waterworks

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.

 

47

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.107 ppb103ND - 0.480 ppb
20190.137 ppb72ND - 0.690 ppb
20200.436 ppb73ND - 2.10 ppb
20210.460 ppb82ND - 3.20 ppb
20220.351 ppb72ND - 2.10 ppb
20230.510 ppb82ND - 3.70 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
2018-03-13989351ND
2018-03-21992144ND
2018-04-11104517ND
2018-04-11104518ND
2018-07-18151825ND
2018-07-181518230.300 ppb
2018-08-08162967ND
2018-08-081629940.480 ppb
2018-10-10192851ND
2018-10-101928480.290 ppb
2019-03-272575390.270 ppb
2019-03-27257504ND
2019-06-19295466ND
2019-08-07313611ND
2019-08-07313610ND
2019-08-073136090.690 ppb
2019-12-03366572ND
2020-05-20421987ND
2020-05-20421988ND
2020-05-204219890.330 ppb
2020-08-264666702.10 ppb
2020-08-264666250.620 ppb
2020-08-26466614ND
2020-12-02510528ND
2021-03-17542733ND
2021-03-17542733ND
2021-05-121005453ND
2021-07-281031722ND
2021-07-281031721ND
2021-08-0410343160.480 ppb
2021-08-0410343173.20 ppb
2021-10-271066877ND
2022-02-161101483ND
2022-06-221156562ND
2022-08-161214110ND
2022-08-1612141082.10 ppb
2022-08-1612141090.360 ppb
2022-08-161214111ND
2022-11-161264899ND
2023-02-081288229ND
2023-02-081288228ND
2023-02-081288227ND
2023-05-311330079ND
2023-07-191350423ND
2023-08-0913585280.380 ppb
2023-08-0913585293.70 ppb
2023-11-281401738ND