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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Elizabeth City

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

 

105

Samples

0

Samples exceeding legal limit (MCL)

105

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201449.7 ppb161627.0 ppb - 80.0 ppb
201546.6 ppb242430.0 ppb - 60.0 ppb
201636.5 ppb161624.0 ppb - 43.0 ppb
201729.4 ppb161616.0 ppb - 48.0 ppb
201854.9 ppb171726.0 ppb - 83.0 ppb
201942.8 ppb161629.0 ppb - 57.0 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
2014-01-069218542700143.0 ppb
2014-01-069218542700245.0 ppb
2014-01-069218542700351.0 ppb
2014-01-069218542700448.0 ppb
2014-04-0792196508001DIS31.0 ppb
2014-04-0792196509001DIS27.0 ppb
2014-04-0792196510001DIS30.0 ppb
2014-04-0792196511001DIS28.0 ppb
2014-07-0892208495001DIS57.0 ppb
2014-07-0892208495002DIS55.0 ppb
2014-07-0892208495003DIS57.0 ppb
2014-07-0892208495004DIS50.0 ppb
2014-10-0692220286001TTH72.0 ppb
2014-10-0692220286002TTH58.0 ppb
2014-10-0692220286003TTH63.0 ppb
2014-10-0692220286004TTH80.0 ppb
2015-01-0845.0 ppb
2015-01-0836.0 ppb
2015-01-0842.0 ppb
2015-01-0849.0 ppb
2015-04-0630.0 ppb
2015-04-0631.0 ppb
2015-04-0631.0 ppb
2015-04-0630.0 ppb
2015-07-0655.0 ppb
2015-07-0645.0 ppb
2015-07-0650.0 ppb
2015-07-0654.0 ppb
2015-10-0558.0 ppb
2015-10-0560.0 ppb
2015-10-0545.0 ppb
2015-10-0544.0 ppb
2015-10-0558.0 ppb
2015-10-0560.0 ppb
2015-10-0545.0 ppb
2015-10-0544.0 ppb
2015-10-0558.0 ppb
2015-10-0560.0 ppb
2015-10-0545.0 ppb
2015-10-0544.0 ppb
2016-01-0592282037001TTH36.0 ppb
2016-01-0592282037002TTH24.0 ppb
2016-01-0592282037003TTH38.0 ppb
2016-01-0592282037004TTH37.0 ppb
2016-04-0592292662001TTH41.0 ppb
2016-04-0592292662002TTH30.0 ppb
2016-04-0592292662003TTH41.0 ppb
2016-04-0592292662004TTH43.0 ppb
2016-07-1192304772001TTH40.6 ppb
2016-07-1192304772002TTH34.4 ppb
2016-07-1192304772003TTH40.6 ppb
2016-07-1192304772004TTH36.0 ppb
2016-10-1292315997001TTH40.4 ppb
2016-10-1292315997002TTH34.8 ppb
2016-10-1292315997003TTH39.0 ppb
2016-10-1292315997004TTH28.4 ppb
2017-01-1092325930001TTH40.0 ppb
2017-01-1092325930002TTH40.0 ppb
2017-01-1092325930003TTH48.0 ppb
2017-01-1092325930004TTH43.0 ppb
2017-04-1092336747001TTH36.0 ppb
2017-04-1092336747002TTH32.0 ppb
2017-04-1092336747003TTH28.0 ppb
2017-04-1092336747004TTH32.0 ppb
2017-07-1092347220001TTH19.0 ppb
2017-07-1092347220002TTH16.0 ppb
2017-07-1092347220003TTH19.0 ppb
2017-07-1092347220004TTH16.0 ppb
2017-10-1092358707001TTH28.0 ppb
2017-10-1092358707002TTH22.0 ppb
2017-10-1092358707003TTH24.0 ppb
2017-10-1092358707004TTH28.0 ppb
2018-01-2492370843001TTH 26.0 ppb
2018-01-2492370843002TTH 41.0 ppb
2018-01-2492370843003TTH 38.0 ppb
2018-01-2492370843004TTH 38.0 ppb
2018-04-2592382473001TTH 75.0 ppb
2018-04-2592382473002TTH 82.0 ppb
2018-04-2592382473003TTH 73.0 ppb
2018-04-2592382473004TTH 83.0 ppb
2018-07-1992392766001TTH 53.0 ppb
2018-07-1992392766002TTH 48.0 ppb
2018-07-1992392766003TTH 57.0 ppb
2018-07-1992392766004TTH 48.0 ppb
2018-07-3092393737001TTH 49.0 ppb
2018-10-1892404170001TTH 53.0 ppb
2018-10-1892404170002TTH 47.0 ppb
2018-10-1892404170003TTH 61.0 ppb
2018-10-1892404170004TTH 62.0 ppb
2019-01-0492412949001_377051.0 ppb
2019-01-0492412949002_377050.0 ppb
2019-01-0492412949003_377057.0 ppb
2019-01-0492412949004_377051.0 ppb
2019-04-1592425913001_377040.0 ppb
2019-04-1592425913002_377044.0 ppb
2019-04-1592425913003_377046.0 ppb
2019-04-1592425913004_377042.0 ppb
2019-07-1592436885001_377036.0 ppb
2019-07-1592436885002_377035.0 ppb
2019-07-1592436885003_377042.0 ppb
2019-07-1592436885004_377041.0 ppb
2019-10-1492449575001_377037.0 ppb
2019-10-1492449575002_377029.0 ppb
2019-10-1492449575003_377043.0 ppb
2019-10-1492449575004_377040.0 ppb