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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Shelby

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

 

97

Samples

0

Samples exceeding legal limit (MCL)

97

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201431.5 ppb16167.00 ppb - 62.0 ppb
201534.3 ppb161611.0 ppb - 89.0 ppb
201631.0 ppb17178.40 ppb - 53.1 ppb
201726.6 ppb16166.90 ppb - 52.0 ppb
201825.5 ppb16164.60 ppb - 46.0 ppb
201920.2 ppb16166.90 ppb - 36.9 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
2014-01-069218566300224.0 ppb
2014-01-069218566300117.0 ppb
2014-01-069218566300425.0 ppb
2014-01-06921856630039.50 ppb
2014-04-0192195772001DIS11.0 ppb
2014-04-0192195772004DIS7.00 ppb
2014-04-0192195772002DIS24.0 ppb
2014-04-0192195772003DIS21.0 ppb
2014-07-0892208482001DIS60.0 ppb
2014-07-0892208482002DIS45.0 ppb
2014-07-0892208482003DIS62.0 ppb
2014-07-0892208482004DIS48.0 ppb
2014-10-0192219526001TTH45.0 ppb
2014-10-0192219526002TTH24.0 ppb
2014-10-0192219526003TTH58.0 ppb
2014-10-0192219526004TTH24.0 ppb
2015-01-0512.0 ppb
2015-01-0517.0 ppb
2015-01-0513.0 ppb
2015-01-0515.0 ppb
2015-04-0117.0 ppb
2015-04-0119.0 ppb
2015-04-0111.0 ppb
2015-04-0112.0 ppb
2015-07-0735.0 ppb
2015-07-0738.0 ppb
2015-07-0789.0 ppb
2015-07-0764.0 ppb
2015-10-0665.8 ppb
2015-10-0662.9 ppb
2015-10-0642.2 ppb
2015-10-0636.1 ppb
2016-01-1192282574006TTH10.00 ppb
2016-01-1192282574008TTH8.40 ppb
2016-01-1192282574007TTH51.0 ppb
2016-01-1192282574005TTH38.1 ppb
2016-04-1192293656004TTH13.7 ppb
2016-04-1192293656003TTH21.1 ppb
2016-04-1192293656001TTH26.7 ppb
2016-04-1292293656002TTH34.3 ppb
2016-07-1292305245004TTH53.1 ppb
2016-07-1292305245003TTH42.9 ppb
2016-07-1292305245002TTH36.7 ppb
2016-07-1292305245001TTH34.8 ppb
2016-10-0492314962001TTH27.5 ppb
2016-10-0492314962002TTH30.4 ppb
2016-10-0492314962003TTH35.6 ppb
2016-10-0492314962004TTH35.7 ppb
2016-10-0592314962007DIS26.9 ppb
2017-01-0592325484003TTH11.0 ppb
2017-01-0592325484002TTH11.0 ppb
2017-01-0592325484001TTH11.0 ppb
2017-01-0592325484004TTH6.90 ppb
2017-04-0492336010003TTH21.0 ppb
2017-04-0492336010004TTH19.0 ppb
2017-04-0492336010002TTH24.0 ppb
2017-04-0492336010001TTH24.0 ppb
2017-07-1192347401006TTH48.0 ppb
2017-07-1192347401005TTH33.0 ppb
2017-07-1192347401004TTH52.0 ppb
2017-07-1192347401003TTH50.0 ppb
2017-10-0392357755001TTH27.0 ppb
2017-10-0392357755002TTH25.0 ppb
2017-10-0392357755003TTH23.0 ppb
2017-10-0392357755004TTH40.0 ppb
2018-01-0292368710004TTH 9.10 ppb
2018-01-0292368710003TTH 16.0 ppb
2018-01-0292368710002TTH 19.0 ppb
2018-01-0292368710001TTH 4.60 ppb
2018-04-0392379544004TTH 28.0 ppb
2018-04-0392379544001TTH 22.0 ppb
2018-04-0392379544002TTH 12.0 ppb
2018-04-0392379544003TTH 14.0 ppb
2018-07-1092391762004TTH 35.0 ppb
2018-07-1092391762003TTH 34.0 ppb
2018-07-1092391762002TTH 39.0 ppb
2018-07-1092391762001TTH 23.0 ppb
2018-10-0292402002003TTH 46.0 ppb
2018-10-0292402002004TTH 31.0 ppb
2018-10-0292402002005TTH 31.0 ppb
2018-10-0292402002006TTH 45.0 ppb
2019-01-0892413390001_377012.0 ppb
2019-01-0892413390002_377012.0 ppb
2019-01-0892413390003_377011.0 ppb
2019-01-0892413390004_377017.0 ppb
2019-04-0392423845001_377013.0 ppb
2019-04-0392423845004_37709.10 ppb
2019-04-0392423845003_37706.90 ppb
2019-04-0392423845002_37709.20 ppb
2019-07-0992436239002_127124.9 ppb
2019-07-0992436239004_127136.9 ppb
2019-07-0992436239003_127135.6 ppb
2019-07-0992436239001_127131.2 ppb
2019-10-0192447962004_377034.0 ppb
2019-10-0192447962003_377019.0 ppb
2019-10-0192447962002_377026.0 ppb
2019-10-0192447962001_377026.0 ppb