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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Town of Apex

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

 

139

Samples

0

Samples exceeding legal limit (MCL)

139

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201411.7 ppb16164.50 ppb - 23.0 ppb
201515.0 ppb16167.20 ppb - 30.0 ppb
201618.4 ppb161610.9 ppb - 30.4 ppb
201715.6 ppb20205.70 ppb - 30.0 ppb
201813.0 ppb32321.80 ppb - 23.0 ppb
20198.43 ppb39393.10 ppb - 21.0 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
2014-02-11921895390015.40 ppb
2014-02-11921895390034.50 ppb
2014-02-11921895390046.40 ppb
2014-02-11921895390056.90 ppb
2014-05-1492201240001DIS10.00 ppb
2014-05-1492201240002DIS12.0 ppb
2014-05-1492201240003DIS11.0 ppb
2014-05-1492201240004DIS11.0 ppb
2014-08-1492213447001TTH23.0 ppb
2014-08-1492213447002TTH21.0 ppb
2014-08-1492213447003TTH23.0 ppb
2014-08-1492213447004TTH23.0 ppb
2014-11-1292225241001TTH7.50 ppb
2014-11-1292225241002TTH7.60 ppb
2014-11-1292225241003TTH7.40 ppb
2014-11-1292225241004TTH7.20 ppb
2015-02-118.30 ppb
2015-02-117.20 ppb
2015-02-119.10 ppb
2015-02-117.90 ppb
2015-05-1329.0 ppb
2015-05-1324.0 ppb
2015-05-1325.0 ppb
2015-05-1330.0 ppb
2015-08-1416.0 ppb
2015-08-1416.0 ppb
2015-08-1414.0 ppb
2015-08-1418.0 ppb
2015-11-129.00 ppb
2015-11-128.00 ppb
2015-11-128.70 ppb
2015-11-129.10 ppb
2016-02-1292286426001TTH22.4 ppb
2016-02-1292286426003TTH19.5 ppb
2016-02-1292286426004TTH21.6 ppb
2016-02-1292286426005TTH22.1 ppb
2016-05-1192297108001TTH14.5 ppb
2016-05-1192297108003TTH12.8 ppb
2016-05-1192297108004TTH10.9 ppb
2016-05-1192297108005TTH14.4 ppb
2016-08-1792309277001TTH30.4 ppb
2016-08-1792309277002TTH19.1 ppb
2016-08-1792309277003TTH26.0 ppb
2016-08-1792309277004TTH29.4 ppb
2016-11-1692319879001TTH12.3 ppb
2016-11-1692319879002TTH12.4 ppb
2016-11-1692319879004TTH13.6 ppb
2016-11-1692319879005TTH12.7 ppb
2017-02-1592329986001TTH13.0 ppb
2017-02-1592329986002TTH13.0 ppb
2017-02-1592329986004TTH13.0 ppb
2017-02-1592329986005TTH10.00 ppb
2017-05-1292340418001TTH23.0 ppb
2017-05-1292340418002TTH23.0 ppb
2017-05-1292340418004TTH21.0 ppb
2017-05-1292340418005TTH19.0 ppb
2017-08-1692351687001TTH28.0 ppb
2017-08-1692351687002TTH29.0 ppb
2017-08-1692351687003TTH30.0 ppb
2017-08-1692351687005TTH25.0 ppb
2017-11-1492363203001TTH7.60 ppb
2017-11-1492363203002TTH11.0 ppb
2017-11-1492363203003TTH7.80 ppb
2017-11-1492363203004TTH6.90 ppb
2017-11-1492363203005TTH7.40 ppb
2017-11-1492363203006TTH9.30 ppb
2017-11-1492363203007TTH9.90 ppb
2017-11-1492363203008TTH5.70 ppb
2018-02-1492373327001TTH 3.50 ppb
2018-02-1492373327002TTH 2.10 ppb
2018-02-1492373327003TTH 2.10 ppb
2018-02-1492373327004TTH 2.70 ppb
2018-02-1492373327005TTH 1.90 ppb
2018-02-1492373327006TTH 1.80 ppb
2018-02-1492373327007TTH 2.20 ppb
2018-02-1492373327008TTH 2.50 ppb
2018-05-1692384990001TTH 23.0 ppb
2018-05-1692384990002TTH 21.0 ppb
2018-05-1692384990003TTH 20.0 ppb
2018-05-1692384990004TTH 21.0 ppb
2018-05-1692384990005TTH 22.0 ppb
2018-05-1692384990006TTH 23.0 ppb
2018-05-1692384990007TTH 23.0 ppb
2018-05-1692384990008TTH 20.0 ppb
2018-08-1492395647001TTH 11.0 ppb
2018-08-1492395647002TTH 13.0 ppb
2018-08-1492395647003TTH 10.00 ppb
2018-08-1492395647004TTH 11.0 ppb
2018-08-1492395647005TTH 12.0 ppb
2018-08-1492395647006TTH 10.00 ppb
2018-08-1492395647007TTH 11.0 ppb
2018-08-1492395647008TTH 10.00 ppb
2018-11-1692407681001TTH 16.0 ppb
2018-11-1692407681002TTH 16.0 ppb
2018-11-1692407681003TTH 17.0 ppb
2018-11-1692407681004TTH 17.0 ppb
2018-11-1692407681005TTH 16.0 ppb
2018-11-1692407681006TTH 20.0 ppb
2018-11-1692407681007TTH 17.0 ppb
2018-11-1692407681008TTH 17.0 ppb
2019-02-1492417771001_37707.60 ppb
2019-02-1492417771001_37707.60 ppb
2019-02-1492417771002_37706.50 ppb
2019-02-1492417771002_37706.50 ppb
2019-02-1492417771004_37707.30 ppb
2019-02-1492417771004_37707.30 ppb
2019-02-1492417771005_37707.20 ppb
2019-02-1492417771005_37707.20 ppb
2019-02-1492417771006_37707.10 ppb
2019-02-1492417771006_37707.10 ppb
2019-02-1492417771007_37708.80 ppb
2019-02-1492417771007_37708.80 ppb
2019-02-1492417771008_37707.00 ppb
2019-02-1492417771009_37707.00 ppb
2019-02-1492417771009_37707.00 ppb
2019-05-1592429303001_377020.0 ppb
2019-05-1592429303002_377020.0 ppb
2019-05-1592429303003_377020.0 ppb
2019-05-1592429303004_377018.0 ppb
2019-05-1592429303005_377021.0 ppb
2019-05-1592429303006_377018.0 ppb
2019-05-1592429303007_377019.0 ppb
2019-05-1592429303008_377016.0 ppb
2019-09-2592446996002_37705.00 ppb
2019-09-2592446996003_37706.70 ppb
2019-09-2592446996004_37704.80 ppb
2019-09-2592446996005_37704.60 ppb
2019-09-2592446996006_37705.10 ppb
2019-09-2592446996007_37704.60 ppb
2019-09-2592446996008_37705.00 ppb
2019-09-2592446996009_37704.90 ppb
2019-11-1392453473001_37703.30 ppb
2019-11-1392453473002_37703.30 ppb
2019-11-1392453473003_37703.30 ppb
2019-11-1392453473004_37703.10 ppb
2019-11-1392453473005_37703.40 ppb
2019-11-1392453473006_37703.20 ppb
2019-11-1392453473007_37703.20 ppb
2019-11-1392453473008_37703.20 ppb