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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Henderson-Kerr Lake Reg Water

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
201449.1 ppb161616.0 ppb - 110.0 ppb
201535.7 ppb161623.0 ppb - 52.0 ppb
201641.4 ppb161618.1 ppb - 71.0 ppb
201735.4 ppb161616.0 ppb - 65.0 ppb
201851.2 ppb161616.0 ppb - 100.0 ppb
201938.9 ppb161624.0 ppb - 59.0 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
2014-02-119218967700216.0 ppb
2014-02-119218967700341.0 ppb
2014-02-119218967700418.0 ppb
2014-02-119218967700120.0 ppb
2014-05-1392201161001TTH55.0 ppb
2014-05-1392201161002TTH28.0 ppb
2014-05-1392201161003TTH100.0 ppb
2014-05-1392201161004TTH25.0 ppb
2014-08-1292213201001TTH100.0 ppb
2014-08-1292213201002TTH55.0 ppb
2014-08-1292213201003TTH110.0 ppb
2014-08-1292213201004TTH55.0 ppb
2014-11-1292225453003TTH47.0 ppb
2014-11-1292225453002TTH43.0 ppb
2014-11-1292225453001TTH47.0 ppb
2014-11-1392225453004TTH25.0 ppb
2015-02-1023.0 ppb
2015-02-1030.0 ppb
2015-02-1046.0 ppb
2015-02-1027.0 ppb
2015-05-1236.0 ppb
2015-05-1239.0 ppb
2015-05-1239.0 ppb
2015-05-1232.0 ppb
2015-08-1152.0 ppb
2015-08-1150.0 ppb
2015-08-1152.0 ppb
2015-08-1138.0 ppb
2015-11-1028.8 ppb
2015-11-1023.8 ppb
2015-11-1027.8 ppb
2015-11-1026.6 ppb
2016-02-0992285879004TTH18.1 ppb
2016-02-0992285879003TTH21.9 ppb
2016-02-0992285879002TTH20.8 ppb
2016-02-0992285879001TTH23.4 ppb
2016-05-1092297063004TTH33.5 ppb
2016-05-1092297063003TTH36.4 ppb
2016-05-1092297063002TTH43.3 ppb
2016-05-1092297063001TTH39.4 ppb
2016-08-0992308578001TTH71.0 ppb
2016-08-0992308578002TTH61.1 ppb
2016-08-0992308578003TTH59.9 ppb
2016-08-0992308578004TTH55.2 ppb
2016-11-0892318998003TTH28.9 ppb
2016-11-0892318998004TTH61.0 ppb
2016-11-0892318998006TTH46.2 ppb
2016-11-0892318998011TTH42.9 ppb
2017-02-1592330204004TTH26.0 ppb
2017-02-1592330204006TTH32.0 ppb
2017-02-1592330204007TTH20.0 ppb
2017-02-1592330204011TTH16.0 ppb
2017-05-0992340094001TTH33.0 ppb
2017-05-0992340094003TTH33.0 ppb
2017-05-0992340094002TTH30.0 ppb
2017-05-0992340094004TTH32.0 ppb
2017-08-0892350856003TTH65.0 ppb
2017-08-0892350856008TTH54.0 ppb
2017-08-0892350856010TTH30.0 ppb
2017-08-0892350856011TTH50.0 ppb
2017-11-1492363440001TTH48.0 ppb
2017-11-1492363440002TTH24.0 ppb
2017-11-1492363440005TTH27.0 ppb
2017-11-1492363440006TTH47.0 ppb
2018-02-1392373408008TTH 100.0 ppb
2018-02-1392373408005TTH 16.0 ppb
2018-02-1392373408004TTH 17.0 ppb
2018-02-1392373408001TTH 52.0 ppb
2018-05-0192383116004TTH 38.0 ppb
2018-05-0192383116001TTH 89.0 ppb
2018-05-0192383116002TTH 22.0 ppb
2018-05-0192383116003TTH 23.0 ppb
2018-08-0892395245004TTH 66.0 ppb
2018-08-0892395245003TTH 62.0 ppb
2018-08-0892395245002TTH 49.0 ppb
2018-08-0892395245001TTH 79.0 ppb
2018-11-0692406545003TTH 62.0 ppb
2018-11-0692406545007TTH 45.0 ppb
2018-11-0692406545008TTH 46.0 ppb
2018-11-0692406545011TTH 53.0 ppb
2019-02-0592416954001_377039.0 ppb
2019-02-0592416954002_377027.0 ppb
2019-02-0592416954003_377059.0 ppb
2019-02-0592416954004_377027.0 ppb
2019-05-0792428873001_377059.0 ppb
2019-05-0792428873004_377052.0 ppb
2019-05-0792428873003_377046.0 ppb
2019-05-0792428873002_377038.0 ppb
2019-08-0692440471004_377046.0 ppb
2019-08-0692440471008_377048.0 ppb
2019-08-0692440471005_377037.0 ppb
2019-08-0692440471001_377029.0 ppb
2019-11-0592452959004_377024.0 ppb
2019-11-0592452959003_377035.0 ppb
2019-11-0592452959002_377029.0 ppb
2019-11-0592452959001_377028.0 ppb