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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Ascension Parish Water Works District 2

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

44

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.863 ppb1612ND - 1.20 ppb
20150.738 ppb1610ND - 1.20 ppb
20160.163 ppb162ND - 1.30 ppb
20170.233 ppb166ND - 0.690 ppb
20186.13 ppb1612ND - 45.5 ppb
20190.0650 ppb162ND - 0.520 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
2014-03-122012360021.20 ppb
2014-03-122012360011.20 ppb
2014-03-122012360021.20 ppb
2014-03-122012360011.20 ppb
2014-06-11201578002ND
2014-06-11205178001ND
2014-06-11205178001ND
2014-06-11201578002ND
2014-09-102093320011.10 ppb
2014-09-102093320021.10 ppb
2014-09-102093320021.10 ppb
2014-09-102093320011.10 ppb
2014-12-1020135200011.20 ppb
2014-12-1020135200021.10 ppb
2014-12-1020135200021.10 ppb
2014-12-1020135200011.20 ppb
2015-03-1120172500011.20 ppb
2015-03-1120172500021.20 ppb
2015-03-1120172500021.20 ppb
2015-03-1120172500011.20 ppb
2015-06-1120212000011.10 ppb
2015-06-112021200002ND
2015-06-112021200002ND
2015-06-1120212000011.10 ppb
2015-09-0920255200021.20 ppb
2015-09-0920255200011.20 ppb
2015-09-0920255200021.20 ppb
2015-09-0920255200011.20 ppb
2015-12-092029833001ND
2015-12-092029833002ND
2015-12-092029833002ND
2015-12-092029833001ND
2016-03-152034069001ND
2016-03-152034069002ND
2016-03-152034069002ND
2016-03-152034069001ND
2016-06-102038200001ND
2016-06-102038200001ND
2016-06-3020389870011.30 ppb
2016-06-3020389870011.30 ppb
2016-09-142042722001ND
2016-09-142042722002ND
2016-09-142042722001ND
2016-09-142042722002ND
2016-12-142047504001ND
2016-12-142047504002ND
2016-12-142047504002ND
2016-12-142047504001ND
2017-03-0935300151007ND
2017-03-0935300151006ND
2017-03-0935300151006ND
2017-03-0935300151007ND
2017-06-1535318870001ND
2017-06-1535318870001ND
2017-06-1535318870002ND
2017-06-1535318870002ND
2017-09-21353374580150.550 ppb
2017-09-2135337458016ND
2017-09-21353374580150.550 ppb
2017-09-2135337458016ND
2017-12-15353637680020.620 ppb
2017-12-15353637680010.690 ppb
2017-12-15353637680010.690 ppb
2017-12-15353637680020.620 ppb
2018-03-0235377680002ND
2018-03-0235377680001ND
2018-03-0235377680002ND
2018-03-0235377680001ND
2018-06-22354001050020.660 ppb
2018-06-22354001050020.660 ppb
2018-06-22354001050010.710 ppb
2018-06-22354001050010.710 ppb
2018-09-14354181170020.550 ppb
2018-09-14354181170010.530 ppb
2018-09-14354181170010.530 ppb
2018-09-14354181170020.550 ppb
2018-12-063543585900145.5 ppb
2018-12-06354358590021.10 ppb
2018-12-063543585900145.5 ppb
2018-12-06354358590021.10 ppb
2019-03-1335455030002ND
2019-03-1335455030001ND
2019-03-1335455030001ND
2019-03-1335455030002ND
2019-06-05354738830020.520 ppb
2019-06-05354738830020.520 ppb
2019-06-0535473883001ND
2019-06-0535473883001ND
2019-09-0435495472002ND
2019-09-0435495472001ND
2019-09-0435495472001ND
2019-09-0435495472002ND
2019-12-1835520096001ND
2019-12-1835520096002ND
2019-12-1835520096001ND
2019-12-1835520096002ND