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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Anson County Water System

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

 

104

Samples

0

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201455.5 ppb161632.0 ppb - 99.0 ppb
201551.3 ppb161625.0 ppb - 80.0 ppb
201642.5 ppb161625.6 ppb - 65.5 ppb
201747.0 ppb161627.0 ppb - 68.0 ppb
201847.6 ppb242435.0 ppb - 64.0 ppb
201938.9 ppb161623.0 ppb - 54.0 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
2014-03-2692195050001DIS36.0 ppb
2014-03-2692195050002DIS33.0 ppb
2014-03-2692195050003DIS32.0 ppb
2014-03-2692195050004DIS33.0 ppb
2014-05-2192202517001DIS76.0 ppb
2014-05-2192202517002DIS77.0 ppb
2014-05-2192202517003DIS93.0 ppb
2014-05-2192202517004DIS99.0 ppb
2014-08-2292214563001TTH86.0 ppb
2014-08-2292214563002TTH59.0 ppb
2014-08-2292214563003TTH59.0 ppb
2014-08-2292214563004TTH56.0 ppb
2014-11-1892226519001TTH34.0 ppb
2014-11-1892226519002TTH35.0 ppb
2014-11-1892226519003TTH46.0 ppb
2014-11-1892226519004TTH34.0 ppb
2015-02-1826.0 ppb
2015-02-1825.0 ppb
2015-02-1825.0 ppb
2015-02-1839.0 ppb
2015-05-2044.0 ppb
2015-05-2040.0 ppb
2015-05-2055.0 ppb
2015-05-2061.0 ppb
2015-08-1955.0 ppb
2015-08-1953.0 ppb
2015-08-1957.0 ppb
2015-08-1980.0 ppb
2015-11-1864.0 ppb
2015-11-1868.0 ppb
2015-11-1863.3 ppb
2015-11-1865.0 ppb
2016-02-1792287116001TTH30.8 ppb
2016-02-1792287116002TTH28.9 ppb
2016-02-1792287116003TTH29.9 ppb
2016-02-1792287116004TTH25.6 ppb
2016-05-1992298434001TTH38.8 ppb
2016-05-1992298434002TTH47.7 ppb
2016-05-1992298434003TTH49.0 ppb
2016-05-1992298434004TTH47.1 ppb
2016-08-1792309424001TTH60.5 ppb
2016-08-1792309424002TTH60.6 ppb
2016-08-1792309424003TTH65.5 ppb
2016-08-1792309424004TTH60.1 ppb
2016-11-1692320211001TTH34.0 ppb
2016-11-1692320211002TTH31.7 ppb
2016-11-1692320211003TTH34.4 ppb
2016-11-1692320211004TTH34.7 ppb
2017-02-1592330355001TTH33.0 ppb
2017-02-1592330355002TTH28.0 ppb
2017-02-1592330355003TTH27.0 ppb
2017-02-1592330355004TTH27.0 ppb
2017-05-1292341157001TTH55.0 ppb
2017-05-1292341157002TTH60.0 ppb
2017-05-1292341157003TTH65.0 ppb
2017-05-1292341157004TTH61.0 ppb
2017-08-1692352111001TTH63.0 ppb
2017-08-1692352111002TTH68.0 ppb
2017-08-1692352111005TTH66.0 ppb
2017-08-1792352111004TTH66.0 ppb
2017-11-1592363800001TTH31.0 ppb
2017-11-1592363800002TTH35.0 ppb
2017-11-1592363800003TTH34.0 ppb
2017-11-1592363800004TTH33.0 ppb
2018-02-1492373624005TTH 35.0 ppb
2018-02-1492373624006TTH 37.0 ppb
2018-02-1492373624007TTH 38.0 ppb
2018-02-1492373624008TTH 40.0 ppb
2018-05-0992384772001TTH 50.0 ppb
2018-05-0992384772002TTH 48.0 ppb
2018-05-0992384772003TTH 52.0 ppb
2018-05-0992384772004TTH 46.0 ppb
2018-08-0992395748001TTH 62.0 ppb
2018-08-0992395748002TTH 64.0 ppb
2018-08-0992395748003TTH 64.0 ppb
2018-08-0992395748004TTH 64.0 ppb
2018-11-282424-18 46.0 ppb
2018-11-282425-18 43.0 ppb
2018-11-282426-18 42.0 ppb
2018-11-282427-18 46.0 ppb
2018-11-2892409452002 44.0 ppb
2018-11-2892409452002_377044.0 ppb
2018-11-2892409452003 43.0 ppb
2018-11-2892409452003_377043.0 ppb
2018-11-2892409452004 42.0 ppb
2018-11-2892409452004_377042.0 ppb
2018-11-2892409452005 54.0 ppb
2018-11-2892409452005_377054.0 ppb
2019-02-1292418267001_377031.0 ppb
2019-02-1292418267002_377031.0 ppb
2019-02-1292418267003_377031.0 ppb
2019-02-1292418267004_377032.0 ppb
2019-05-2292430651001_377054.0 ppb
2019-05-2292430651002_377050.0 ppb
2019-05-2292430651003_377054.0 ppb
2019-05-2292430651004_377051.0 ppb
2019-08-1492442133002_377053.0 ppb
2019-08-1492442133004_377047.0 ppb
2019-08-2092442133001_377047.0 ppb
2019-08-2692442996001_377039.0 ppb
2019-11-1992455540001_377028.0 ppb
2019-11-1992455540002_377026.0 ppb
2019-11-1992455540004_377025.0 ppb
2019-12-0492457286001_377023.0 ppb