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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Slidell Water Supply

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

 

194

Samples

0

Samples exceeding legal limit (MCL)

186

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20149.19 ppb34343.10 ppb - 14.5 ppb
201511.3 ppb32323.40 ppb - 17.7 ppb
201612.5 ppb32325.50 ppb - 22.2 ppb
20174.82 ppb3224ND - 18.8 ppb
20181.13 ppb32320.660 ppb - 1.80 ppb
20191.29 ppb32320.750 ppb - 1.80 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
2014-02-0620116279812.7 ppb
2014-02-062011628009.50 ppb
2014-02-062011628029.40 ppb
2014-02-062011628039.50 ppb
2014-02-0620116279812.7 ppb
2014-02-062011628009.50 ppb
2014-02-062011628029.40 ppb
2014-02-062011628039.50 ppb
2014-05-0320337000111.4 ppb
2014-05-0320337000212.5 ppb
2014-05-0320337000312.7 ppb
2014-05-032033700046.10 ppb
2014-05-0320337000111.4 ppb
2014-05-0320337000212.5 ppb
2014-05-0320337000312.7 ppb
2014-05-032033700046.10 ppb
2014-08-0720768100111.1 ppb
2014-08-0720768100214.5 ppb
2014-08-072076810038.30 ppb
2014-08-072076810048.50 ppb
2014-08-0720768100111.1 ppb
2014-08-0720768100214.5 ppb
2014-08-072076810038.30 ppb
2014-08-072076810048.50 ppb
2014-09-042089600017.00 ppb
2014-09-042089600017.00 ppb
2014-11-0320117500017.80 ppb
2014-11-0320117500026.90 ppb
2014-11-0320117500035.20 ppb
2014-11-0320117500043.10 ppb
2014-11-0320117500017.80 ppb
2014-11-0320117500026.90 ppb
2014-11-0320117500035.20 ppb
2014-11-0320117500043.10 ppb
2015-02-0320155970017.70 ppb
2015-02-0320155970027.60 ppb
2015-02-0320155970033.40 ppb
2015-02-0320155970049.50 ppb
2015-02-0320155970017.70 ppb
2015-02-0320155970027.60 ppb
2015-02-0320155970033.40 ppb
2015-02-0320155970049.50 ppb
2015-05-0520194810018.60 ppb
2015-05-05201948100217.3 ppb
2015-05-0520194810036.60 ppb
2015-05-05201948100410.1 ppb
2015-05-0520194810018.60 ppb
2015-05-05201948100217.3 ppb
2015-05-0520194810036.60 ppb
2015-05-05201948100410.1 ppb
2015-07-15202275200114.4 ppb
2015-07-15202275200213.2 ppb
2015-07-15202275200316.0 ppb
2015-07-15202275200415.4 ppb
2015-07-15202275200114.4 ppb
2015-07-15202275200213.2 ppb
2015-07-15202275200316.0 ppb
2015-07-15202275200415.4 ppb
2015-12-0220293980019.70 ppb
2015-12-02202939800217.7 ppb
2015-12-02202939800310.3 ppb
2015-12-02202939800413.0 ppb
2015-12-0220293980019.70 ppb
2015-12-02202939800217.7 ppb
2015-12-02202939800310.3 ppb
2015-12-02202939800413.0 ppb
2016-02-02203200400116.3 ppb
2016-02-0220320040027.30 ppb
2016-02-0220320040037.30 ppb
2016-02-02203200400410.7 ppb
2016-02-02203200400116.3 ppb
2016-02-0220320040027.30 ppb
2016-02-0220320040037.30 ppb
2016-02-02203200400410.7 ppb
2016-05-0920364550019.70 ppb
2016-05-09203645500214.6 ppb
2016-05-09203645500310.8 ppb
2016-05-0920364550048.30 ppb
2016-05-0920364550019.70 ppb
2016-05-09203645500214.6 ppb
2016-05-09203645500310.8 ppb
2016-05-0920364550048.30 ppb
2016-08-04204077600113.8 ppb
2016-08-04204077600222.2 ppb
2016-08-04204077600313.3 ppb
2016-08-04204077600415.2 ppb
2016-08-04204077600113.8 ppb
2016-08-04204077600222.2 ppb
2016-08-04204077600313.3 ppb
2016-08-04204077600415.2 ppb
2016-11-08204542400116.2 ppb
2016-11-08204542400214.9 ppb
2016-11-08204542400313.5 ppb
2016-11-0820454240045.50 ppb
2016-11-08204542400116.2 ppb
2016-11-08204542400214.9 ppb
2016-11-08204542400313.5 ppb
2016-11-0820454240045.50 ppb
2017-02-023529297000717.8 ppb
2017-02-023529297000818.8 ppb
2017-02-023529297000910.3 ppb
2017-02-023529297001017.3 ppb
2017-02-023529297000717.8 ppb
2017-02-023529297000818.8 ppb
2017-02-023529297000910.3 ppb
2017-02-023529297001017.3 ppb
2017-05-05353107640032.00 ppb
2017-05-05353107640042.70 ppb
2017-05-05353107640050.650 ppb
2017-05-05353107640061.10 ppb
2017-05-05353107640032.00 ppb
2017-05-05353107640042.70 ppb
2017-05-05353107640050.650 ppb
2017-05-05353107640061.10 ppb
2017-08-07353292920091.70 ppb
2017-08-0735329292010ND
2017-08-0735329292011ND
2017-08-07353292920341.70 ppb
2017-08-07353292920091.70 ppb
2017-08-0735329292010ND
2017-08-0735329292011ND
2017-08-07353292920341.70 ppb
2017-11-01353461420011.60 ppb
2017-11-01353461420021.40 ppb
2017-11-0135346142003ND
2017-11-0135346142004ND
2017-11-01353461420011.60 ppb
2017-11-01353461420021.40 ppb
2017-11-0135346142003ND
2017-11-0135346142004ND
2018-02-01353718590011.50 ppb
2018-02-01353718590021.60 ppb
2018-02-01353718590031.80 ppb
2018-02-01353718590040.860 ppb
2018-02-01353718590011.50 ppb
2018-02-01353718590021.60 ppb
2018-02-01353718590031.80 ppb
2018-02-01353718590040.860 ppb
2018-05-04353902800011.20 ppb
2018-05-04353902800021.20 ppb
2018-05-04353902800030.660 ppb
2018-05-04353902800040.810 ppb
2018-05-04353902800011.20 ppb
2018-05-04353902800021.20 ppb
2018-05-04353902800030.660 ppb
2018-05-04353902800040.810 ppb
2018-08-03354087570011.50 ppb
2018-08-03354087570021.40 ppb
2018-08-03354087570030.740 ppb
2018-08-03354087570040.750 ppb
2018-08-03354087570011.50 ppb
2018-08-03354087570021.40 ppb
2018-08-03354087570030.740 ppb
2018-08-03354087570040.750 ppb
2018-11-01354280540011.30 ppb
2018-11-01354280540021.40 ppb
2018-11-01354280540030.680 ppb
2018-11-01354280540040.730 ppb
2018-11-01354280540011.30 ppb
2018-11-01354280540021.40 ppb
2018-11-01354280540030.680 ppb
2018-11-01354280540040.730 ppb
2019-02-14354488460011.80 ppb
2019-02-14354488460021.80 ppb
2019-02-14354488460031.10 ppb
2019-02-14354488460040.930 ppb
2019-02-14354488460011.80 ppb
2019-02-14354488460021.80 ppb
2019-02-14354488460031.10 ppb
2019-02-14354488460040.930 ppb
2019-05-03354660760011.60 ppb
2019-05-03354660760021.20 ppb
2019-05-03354660760031.000 ppb
2019-05-03354660760041.50 ppb
2019-05-03354660760011.60 ppb
2019-05-03354660760021.20 ppb
2019-05-03354660760031.000 ppb
2019-05-03354660760041.50 ppb
2019-08-16354911120011.70 ppb
2019-08-16354911120021.50 ppb
2019-08-16354911120030.880 ppb
2019-08-16354911120040.880 ppb
2019-08-16354911120011.70 ppb
2019-08-16354911120021.50 ppb
2019-08-16354911120030.880 ppb
2019-08-16354911120040.880 ppb
2019-11-08355110660011.70 ppb
2019-11-08355110660021.40 ppb
2019-11-08355110660030.750 ppb
2019-11-08355110660040.820 ppb
2019-11-08355110660011.70 ppb
2019-11-08355110660021.40 ppb
2019-11-08355110660030.750 ppb
2019-11-08355110660040.820 ppb