Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Clay WDS

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201424.0 ppb161610.00 ppb - 40.0 ppb
201526.8 ppb16167.40 ppb - 45.0 ppb
201626.1 ppb161614.0 ppb - 44.0 ppb
201727.3 ppb161613.0 ppb - 46.0 ppb
201823.4 ppb161612.0 ppb - 31.0 ppb
201928.0 ppb161616.0 ppb - 40.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-101Q2014 CROSSROAD36.0 ppb
2014-02-101Q2014 SHOREVIEW10.00 ppb
2014-02-101Q2014 MOYERS CO14.0 ppb
2014-02-101Q2014 FOSTER RD26.0 ppb
2014-05-212Q2014 FOSTER RD35.0 ppb
2014-05-212Q2014 CROSSROAD40.0 ppb
2014-05-212Q2014 MOYERS CO21.0 ppb
2014-05-212Q2014 SHOREVIEW14.0 ppb
2014-08-203Q2014 FOSTER RD27.0 ppb
2014-08-203Q2014 MOYERS CO25.0 ppb
2014-08-203Q2014 SHOREVIEW18.0 ppb
2014-08-203Q2014 CROSSROAD31.0 ppb
2014-12-264Q2014 MOYERS CO10.00 ppb
2014-12-264Q2014 CROSSROAD28.0 ppb
2014-12-264Q2014 SHOREVIEW15.0 ppb
2014-12-264Q2014 FOSTER RD34.0 ppb
2015-03-031Q2015 CROSSROAD43.0 ppb
2015-03-031Q2015 FOSTER RD23.0 ppb
2015-03-031Q2015 MOYERS CO12.0 ppb
2015-03-031Q2015 SHOREVIEW7.40 ppb
2015-06-152Q2015 CROSSROAD28.0 ppb
2015-06-152Q2015 FOSTER RD26.0 ppb
2015-06-152Q2015 MOYERS CO25.0 ppb
2015-06-152Q2015 SHOREVIEW15.0 ppb
2015-09-023Q2015 CROSSROAD32.0 ppb
2015-09-023Q2015 SHOREVIEW18.0 ppb
2015-09-023Q2015 FOSTER RD32.0 ppb
2015-09-023Q2015 MOYERS CO34.0 ppb
2015-12-024Q2015 CROSSROAD41.0 ppb
2015-12-024Q2015 FOSTER RD45.0 ppb
2015-12-024Q2015 SHOREVIEW23.0 ppb
2015-12-024Q2015 MOYERS CO24.0 ppb
2016-03-021Q2016 MOYERS CO20.0 ppb
2016-03-021Q2016 FOSTER RD27.0 ppb
2016-03-021Q2016 CROSSROAD41.0 ppb
2016-03-021Q2016 SHOREVIEW14.0 ppb
2016-06-012Q2016 FOSTER RD24.0 ppb
2016-06-012Q2016 CROSSROAD44.0 ppb
2016-06-012Q2016 SHOREVIEW16.0 ppb
2016-06-012Q2016 MOYERS CO28.0 ppb
2016-09-073Q2016 CROSSROAD29.0 ppb
2016-09-073Q2016 SHOREVIEW18.0 ppb
2016-09-073Q2016 MOYERS CO28.0 ppb
2016-09-073Q2016 FOSTER RD25.0 ppb
2016-12-074Q2016 CROSSROAD41.0 ppb
2016-12-074Q2016 SHOREVIEW15.0 ppb
2016-12-074Q2016 FOSTER RD31.0 ppb
2016-12-074Q2016 MOYERS CO17.0 ppb
2017-03-011Q2017 MOYERS CO17.0 ppb
2017-03-011Q2017 FOSTER RD23.0 ppb
2017-03-011Q2017 CROSSROAD34.0 ppb
2017-03-011Q2017 SHOREVIEW14.0 ppb
2017-06-072Q2017 CROSSROAD33.0 ppb
2017-06-072Q2017 MOYERS CO30.0 ppb
2017-06-072Q2017 FOSTER RD32.0 ppb
2017-06-072Q2017 SHOREVIEW22.0 ppb
2017-09-203Q2017 CROSSROAD46.0 ppb
2017-09-203Q2017 MOYERS CO33.0 ppb
2017-09-203Q2017 SHOREVIEW30.0 ppb
2017-09-203Q2017 FOSTER RD36.0 ppb
2017-12-064Q2017 SHOREVIEW13.0 ppb
2017-12-064Q2017 MOYERS CO15.0 ppb
2017-12-064Q2017 CROSSROAD32.0 ppb
2017-12-064Q2017 FOSTER RD26.0 ppb
2018-03-071Q2018 CROSSROAD29.0 ppb
2018-03-071Q2018 SHOREVIEW15.0 ppb
2018-03-071Q2018 FOSTER RD24.0 ppb
2018-03-071Q2018 MOYERS CO17.0 ppb
2018-06-062Q2018 SHOREVIEW18.0 ppb
2018-06-062Q2018 CROSSROAD30.0 ppb
2018-06-062Q2018 MOYERS CO27.0 ppb
2018-06-062Q2018 FOSTER RD30.0 ppb
2018-09-053Q2018 CROSSROAD31.0 ppb
2018-09-053Q2018 SHOREVIEW22.0 ppb
2018-09-053Q2018 FOSTER RD29.0 ppb
2018-09-073Q2018 MOYERS CO23.0 ppb
2018-12-054Q2018 CROSSROAD27.0 ppb
2018-12-054Q2018 SHOREVIEW12.0 ppb
2018-12-054Q2018 MOYERS CO15.0 ppb
2018-12-054Q2018 FOSTER RD25.0 ppb
2019-03-061Q2019 SHOREVIEW17.0 ppb
2019-03-061Q2019 FOSTER RD27.0 ppb
2019-03-061Q2019 CROSSROAD38.0 ppb
2019-03-061Q2019 MOYERS CO22.0 ppb
2019-06-052Q2019 FOSTER RD26.0 ppb
2019-06-052Q2019 MOYERS CO21.0 ppb
2019-06-052Q2019 CROSSROAD22.0 ppb
2019-06-052Q2019 SHOREVIEW16.0 ppb
2019-09-043Q2019 SHOREVIEW26.0 ppb
2019-09-043Q2019 FOSTER RD38.0 ppb
2019-09-043Q2019 MOYERS CO34.0 ppb
2019-09-043Q2019 CROSSROAD31.0 ppb
2019-12-044Q2019 SHOREVIEW40.0 ppb
2019-12-044Q2019 FOSTER RD29.0 ppb
2019-12-044Q2019 CROSSROAD40.0 ppb
2019-12-044Q2019 MOYERS CO21.0 ppb