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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Baton Rouge Water Company

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

 

288

Samples

0

Samples exceeding legal limit (MCL)

120

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.13 ppb11626ND - 19.3 ppb
20151.80 ppb4416ND - 9.70 ppb
20162.13 ppb3212ND - 7.80 ppb
20171.87 ppb3228ND - 6.00 ppb
20181.42 ppb3220ND - 5.50 ppb
20191.64 ppb3218ND - 6.90 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
2014-01-13AD88277ND
2014-01-13AD88278ND
2014-01-13AD88279ND
2014-01-13AD88280ND
2014-01-13AD88281ND
2014-01-13AD88277ND
2014-01-13AD88278ND
2014-01-13AD88279ND
2014-01-13AD88280ND
2014-01-13AD88281ND
2014-01-14201158146ND
2014-01-14201158146ND
2014-01-152011581491.40 ppb
2014-01-152011581501.10 ppb
2014-01-152011581510.860 ppb
2014-01-1520115815219.3 ppb
2014-01-15201158153ND
2014-01-152011581491.40 ppb
2014-01-152011581501.10 ppb
2014-01-152011581510.860 ppb
2014-01-1520115815219.3 ppb
2014-01-15201158153ND
2014-04-15202865004ND
2014-04-15202865005ND
2014-04-1520286500617.1 ppb
2014-04-15202866002ND
2014-04-15202866003ND
2014-04-152028660067.00 ppb
2014-04-15202865004ND
2014-04-15202865005ND
2014-04-1520286500617.1 ppb
2014-04-15202866002ND
2014-04-15202866003ND
2014-04-152028660067.00 ppb
2014-05-05AD91129ND
2014-05-05AD91130ND
2014-05-05AD91131ND
2014-05-05AD91132ND
2014-05-05AD91133ND
2014-05-05AD91129ND
2014-05-05AD91130ND
2014-05-05AD91131ND
2014-05-05AD91132ND
2014-05-05AD91133ND
2014-05-12AD91432ND
2014-05-12AD91433ND
2014-05-12AD91434ND
2014-05-12AD91435ND
2014-05-12AD91436ND
2014-05-12AD91432ND
2014-05-12AD91433ND
2014-05-12AD91434ND
2014-05-12AD91435ND
2014-05-12AD91436ND
2014-05-19AD91649ND
2014-05-19AD91650ND
2014-05-19AD91651ND
2014-05-19AD91652ND
2014-05-19AD91653ND
2014-05-19AD91649ND
2014-05-19AD91650ND
2014-05-19AD91651ND
2014-05-19AD91652ND
2014-05-19AD91653ND
2014-06-09AD92073ND
2014-06-09AD92073ND
2014-07-14AD93462ND
2014-07-14AD93463ND
2014-07-14AD93464ND
2014-07-14AD93462ND
2014-07-14AD93463ND
2014-07-14AD93464ND
2014-07-17207090001ND
2014-07-17207090002ND
2014-07-17207090003ND
2014-07-172070900045.80 ppb
2014-07-17207090005ND
2014-07-17207090006ND
2014-07-17207090001ND
2014-07-17207090002ND
2014-07-17207090003ND
2014-07-172070900045.80 ppb
2014-07-17207090005ND
2014-07-17207090006ND
2014-07-21AD93465ND
2014-07-21AD94007ND
2014-07-21AD94008ND
2014-07-21AD94009ND
2014-07-21AD94010ND
2014-07-21AD94011ND
2014-07-21AD93465ND
2014-07-21AD94007ND
2014-07-21AD94008ND
2014-07-21AD94009ND
2014-07-21AD94010ND
2014-07-21AD94011ND
2014-08-11AD95163ND
2014-08-11AD95164ND
2014-08-11AD95165ND
2014-08-11AD95167ND
2014-08-11AD95163ND
2014-08-11AD95164ND
2014-08-11AD95165ND
2014-08-11AD95167ND
2014-10-1720112230011.40 ppb
2014-10-1720112230021.20 ppb
2014-10-1720112230031.20 ppb
2014-10-1720112230041.20 ppb
2014-10-1720112230056.80 ppb
2014-10-1720112230061.10 ppb
2014-10-1720112230011.40 ppb
2014-10-1720112230021.20 ppb
2014-10-1720112230031.20 ppb
2014-10-1720112230041.20 ppb
2014-10-1720112230056.80 ppb
2014-10-1720112230061.10 ppb
2015-01-142015090001ND
2015-01-142015090002ND
2015-01-1420150900039.70 ppb
2015-01-142015090004ND
2015-01-142015090005ND
2015-01-1420150900061.20 ppb
2015-01-142015090001ND
2015-01-142015090002ND
2015-01-1420150900039.70 ppb
2015-01-142015090004ND
2015-01-142015090005ND
2015-01-1420150900061.20 ppb
2015-04-1720188260017.90 ppb
2015-04-172018826002ND
2015-04-172018826003ND
2015-04-1720188260044.70 ppb
2015-04-172018826005ND
2015-04-172018826006ND
2015-04-1720188260017.90 ppb
2015-04-172018826002ND
2015-04-172018826003ND
2015-04-1720188260044.70 ppb
2015-04-172018826005ND
2015-04-172018826006ND
2015-07-1520228190012.80 ppb
2015-07-152022819002ND
2015-07-152022819003ND
2015-07-1520228190045.40 ppb
2015-07-152022819005ND
2015-07-152022819006ND
2015-07-1520228190012.80 ppb
2015-07-152022819002ND
2015-07-152022819003ND
2015-07-1520228190045.40 ppb
2015-07-152022819005ND
2015-07-152022819006ND
2015-10-152027291001ND
2015-10-152027291002ND
2015-10-1520272910031.000 ppb
2015-10-1520272910046.90 ppb
2015-10-152027291001ND
2015-10-152027291002ND
2015-10-1520272910031.000 ppb
2015-10-1520272910046.90 ppb
2016-01-152031365001ND
2016-01-1520313650026.30 ppb
2016-01-1520313650037.60 ppb
2016-01-1520313650041.000 ppb
2016-01-152031365001ND
2016-01-1520313650026.30 ppb
2016-01-1520313650037.60 ppb
2016-01-1520313650041.000 ppb
2016-04-182035422001ND
2016-04-1820354220026.10 ppb
2016-04-182035422003ND
2016-04-182035422004ND
2016-04-182035422001ND
2016-04-1820354220026.10 ppb
2016-04-182035422003ND
2016-04-182035422004ND
2016-07-182040020001ND
2016-07-1820400200025.20 ppb
2016-07-18204002003ND
2016-07-18204020004ND
2016-07-182040020001ND
2016-07-1820400200025.20 ppb
2016-07-18204002003ND
2016-07-18204020004ND
2016-10-202044503001ND
2016-10-2020445030027.80 ppb
2016-10-202044503003ND
2016-10-202044503004ND
2016-10-202044503001ND
2016-10-2020445030027.80 ppb
2016-10-202044503003ND
2016-10-202044503004ND
2017-01-20352901910020.580 ppb
2017-01-20352901910030.990 ppb
2017-01-20352901910040.560 ppb
2017-01-20352901910055.70 ppb
2017-01-20352901910020.580 ppb
2017-01-20352901910030.990 ppb
2017-01-20352901910040.560 ppb
2017-01-20352901910055.70 ppb
2017-04-13353065080030.710 ppb
2017-04-13353065080040.550 ppb
2017-04-13353065080050.520 ppb
2017-04-13353065080065.80 ppb
2017-04-13353065080030.710 ppb
2017-04-13353065080040.550 ppb
2017-04-13353065080050.520 ppb
2017-04-13353065080065.80 ppb
2017-07-07353226210070.760 ppb
2017-07-0735322621008ND
2017-07-0735322621009ND
2017-07-07353226210106.00 ppb
2017-07-07353226210070.760 ppb
2017-07-0735322621008ND
2017-07-0735322621009ND
2017-07-07353226210106.00 ppb
2017-10-05353406360012.10 ppb
2017-10-05353406360020.490 ppb
2017-10-05353406360030.570 ppb
2017-10-05353406360044.60 ppb
2017-10-05353406360012.10 ppb
2017-10-05353406360020.490 ppb
2017-10-05353406360030.570 ppb
2017-10-05353406360044.60 ppb
2018-01-12353683490011.10 ppb
2018-01-12353683490020.600 ppb
2018-01-12353683490030.460 ppb
2018-01-12353683490045.30 ppb
2018-01-12353683490011.10 ppb
2018-01-12353683490020.600 ppb
2018-01-12353683490030.460 ppb
2018-01-12353683490045.30 ppb
2018-04-13353861440011.50 ppb
2018-04-1335386144002ND
2018-04-1335386144003ND
2018-04-1335386144004ND
2018-04-13353861440011.50 ppb
2018-04-1335386144002ND
2018-04-1335386144003ND
2018-04-1335386144004ND
2018-07-06354026090010.900 ppb
2018-07-0635402609002ND
2018-07-06354026090030.560 ppb
2018-07-06354026090045.50 ppb
2018-07-06354026090010.900 ppb
2018-07-0635402609002ND
2018-07-06354026090030.560 ppb
2018-07-06354026090045.50 ppb
2018-10-12354240300011.50 ppb
2018-10-1235424030002ND
2018-10-1235424030003ND
2018-10-12354240300045.30 ppb
2018-10-12354240300011.50 ppb
2018-10-1235424030002ND
2018-10-1235424030003ND
2018-10-12354240300045.30 ppb
2019-01-17354431630011.20 ppb
2019-01-1735443163002ND
2019-01-1735443163003ND
2019-01-17354431630046.90 ppb
2019-01-17354431630011.20 ppb
2019-01-1735443163002ND
2019-01-1735443163003ND
2019-01-17354431630046.90 ppb
2019-04-0835460486001ND
2019-04-0835460486002ND
2019-04-0835460486003ND
2019-04-08354604860045.10 ppb
2019-04-0835460486001ND
2019-04-0835460486002ND
2019-04-0835460486003ND
2019-04-08354604860045.10 ppb
2019-07-18354835350010.520 ppb
2019-07-18354835350020.420 ppb
2019-07-18354835350030.510 ppb
2019-07-18354835350045.50 ppb
2019-07-18354835350010.520 ppb
2019-07-18354835350020.420 ppb
2019-07-18354835350030.510 ppb
2019-07-18354835350045.50 ppb
2019-10-18355062380010.740 ppb
2019-10-1835506238002ND
2019-10-1835506238003ND
2019-10-18355062380045.30 ppb
2019-10-18355062380010.740 ppb
2019-10-1835506238002ND
2019-10-1835506238003ND
2019-10-18355062380045.30 ppb