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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Perkasie Regional Authority

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

 

93

Samples

0

Samples exceeding legal limit (MCL)

55

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.84 ppb2717ND - 15.7 ppb
20152.70 ppb2315ND - 13.4 ppb
20161.74 ppb133ND - 14.0 ppb
20171.95 ppb122ND - 14.0 ppb
20186.43 ppb16161.50 ppb - 16.9 ppb
20195.20 ppb223.90 ppb - 6.50 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
2014-02-11L4905024-41.97 ppb
2014-02-11L4905024-13.49 ppb
2014-02-11L4905024-21.85 ppb
2014-02-11L4905024-35.09 ppb
2014-03-11L2515685-2ND
2014-03-11L2515685-1ND
2014-05-13L5023551-43.05 ppb
2014-05-13L5023551-37.93 ppb
2014-05-13L5023551-15.67 ppb
2014-05-13L5023551-23.12 ppb
2014-06-10L5101092-12ND
2014-06-10L5101092-11ND
2014-08-12L5168865-48.69 ppb
2014-08-12L5168865-315.7 ppb
2014-08-12L5168865-111.4 ppb
2014-08-12L5168865-28.40 ppb
2014-09-09L5170431-1ND
2014-09-09L5170431-30.900 ppb
2014-09-09L5170431-5ND
2014-09-09L5170431-4ND
2014-09-09L5170431-2ND
2014-11-11L5292506-19.76 ppb
2014-11-11L5292506-23.91 ppb
2014-11-11L5292506-44.00 ppb
2014-11-11L5292506-38.74 ppb
2014-12-09L5292845-2ND
2014-12-09L5292845-1ND
2015-02-10123882651.51 ppb
2015-02-10123882473.03 ppb
2015-02-10123882531.54 ppb
2015-02-10123882593.70 ppb
2015-03-1012501676ND
2015-03-1012501730ND
2015-05-12127362463.09 ppb
2015-05-12127362402.85 ppb
2015-05-12127362526.84 ppb
2015-05-12127362583.26 ppb
2015-06-09128677190.600 ppb
2015-06-0912867665ND
2015-08-111312147013.4 ppb
2015-08-11131214766.82 ppb
2015-09-0813250259ND
2015-09-08132501510.900 ppb
2015-09-0813250205ND
2015-09-0813250097ND
2015-09-0813250313ND
2015-11-10135011468.38 ppb
2015-11-10135011525.38 ppb
2015-12-08136196880.700 ppb
2015-12-0813619634ND
2016-03-08139727840.600 ppb
2016-03-0813972732ND
2016-06-0714389049ND
2016-06-0714389101ND
2016-08-02147182558.00 ppb
2016-08-021471824914.0 ppb
2016-09-1314889447ND
2016-09-1314889603ND
2016-09-1314889551ND
2016-09-1314889655ND
2016-09-1314889499ND
2016-12-0615356009ND
2016-12-0615356061ND
2017-03-0715780115ND
2017-03-0715780167ND
2017-06-0616240792ND
2017-06-0616240740ND
2017-08-011654889314.0 ppb
2017-08-01165488999.40 ppb
2017-09-0516710953ND
2017-09-0516711057ND
2017-09-0516711005ND
2017-09-0516710901ND
2017-12-0517146796ND
2017-12-0517146848ND
2018-02-12L6999464-42.90 ppb
2018-02-12L6999464-31.50 ppb
2018-02-12L6999464-21.50 ppb
2018-02-12L6999464-15.60 ppb
2018-05-158051036-016.10 ppb
2018-05-158051036-025.00 ppb
2018-05-158051036-032.00 ppb
2018-05-158051036-044.60 ppb
2018-08-148080326-029.70 ppb
2018-08-148080326-0116.9 ppb
2018-08-148080326-03RE2.90 ppb
2018-08-148080326-0411.6 ppb
2018-11-138110454-029.50 ppb
2018-11-138110454-039.30 ppb
2018-11-138110454-0111.6 ppb
2018-11-138110454-042.10 ppb
2019-11-119111102-023.90 ppb
2019-11-119111102-016.50 ppb