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EWG's Tap Water Database — 2019 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.

 

390

Samples

0

Samples exceeding legal limit (MCL)

128

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.899 ppb6020ND - 6.30 ppb
20130.989 ppb10628ND - 14.2 ppb
20141.13 ppb11626ND - 19.3 ppb
20151.80 ppb4416ND - 9.70 ppb
20162.13 ppb3212ND - 7.80 ppb
20171.87 ppb3228ND - 6.00 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
2012-01-12209559166.30 ppb
2012-01-1220955921ND
2012-01-12209559166.30 ppb
2012-01-1220955921ND
2012-01-1920955895ND
2012-01-19209558960.110 ppb
2012-01-1920955898ND
2012-01-1920955903ND
2012-01-1929055903ND
2012-01-1920955895ND
2012-01-19209558960.110 ppb
2012-01-1920955898ND
2012-01-1920955903ND
2012-01-1929055903ND
2012-04-19201083694ND
2012-04-19201083694ND
2012-05-07209862816.20 ppb
2012-05-0720986283ND
2012-05-0720986285ND
2012-05-07209862860.620 ppb
2012-05-0720986287ND
2012-05-0720986288ND
2012-05-07209862816.20 ppb
2012-05-0720986283ND
2012-05-0720986285ND
2012-05-07209862860.620 ppb
2012-05-0720986287ND
2012-05-0720986288ND
2012-07-09AD67317ND
2012-07-09AD67318ND
2012-07-09AD67317ND
2012-07-09AD67318ND
2012-07-172010064701.000 ppb
2012-07-17201006472ND
2012-07-17201006473ND
2012-07-172010064701.000 ppb
2012-07-17201006472ND
2012-07-17201006473ND
2012-07-18201006475ND
2012-07-182010064766.00 ppb
2012-07-18201006477ND
2012-07-18201006475ND
2012-07-182010064766.00 ppb
2012-07-18201006477ND
2012-10-182010348584.40 ppb
2012-10-182010348590.570 ppb
2012-10-182010348601.10 ppb
2012-10-182010348610.660 ppb
2012-10-182010348584.40 ppb
2012-10-182010348590.570 ppb
2012-10-182010348601.10 ppb
2012-10-182010348610.660 ppb
2012-10-19201034862ND
2012-10-19201034863ND
2012-10-19201034862ND
2012-10-19201034863ND
2012-10-22AD72430ND
2012-10-22AD72430ND
2012-11-19AD73354ND
2012-11-19AD73354ND
2013-01-14AD74723ND
2013-01-14AD74724ND
2013-01-14AD74725ND
2013-01-14AD74723ND
2013-01-14AD74724ND
2013-01-14AD74725ND
2013-01-172010607470.860 ppb
2013-01-172010607480.980 ppb
2013-01-172010607491.30 ppb
2013-01-172010607519.70 ppb
2013-01-172010607530.800 ppb
2013-01-172010607470.860 ppb
2013-01-172010607480.980 ppb
2013-01-172010607491.30 ppb
2013-01-172010607519.70 ppb
2013-01-172010607530.800 ppb
2013-01-182010607500.970 ppb
2013-01-182010607500.970 ppb
2013-01-28AD75025ND
2013-01-28AD75026ND
2013-01-28AD75027ND
2013-01-28AD75028ND
2013-01-28AD75029ND
2013-01-28AD75025ND
2013-01-28AD75026ND
2013-01-28AD75027ND
2013-01-28AD75028ND
2013-01-28AD75029ND
2013-02-04AD75283ND
2013-02-04AD75284ND
2013-02-04AD75285ND
2013-02-04AD75286ND
2013-02-04AD75287ND
2013-02-04AD75283ND
2013-02-04AD75284ND
2013-02-04AD75285ND
2013-02-04AD75286ND
2013-02-04AD75287ND
2013-03-11AD75943ND
2013-03-11AD75944ND
2013-03-11AD75945ND
2013-03-11AD75946ND
2013-03-11AD75947ND
2013-03-11AD75943ND
2013-03-11AD75944ND
2013-03-11AD75945ND
2013-03-11AD75946ND
2013-03-11AD75947ND
2013-04-01AD76514ND
2013-04-01AD76515ND
2013-04-01AD76516ND
2013-04-01AD76514ND
2013-04-01AD76515ND
2013-04-01AD76516ND
2013-04-08AD76715ND
2013-04-08AD76715ND
2013-04-15AD76936ND
2013-04-15AD76937ND
2013-04-15AD76938ND
2013-04-15AD76939ND
2013-04-15AD76940ND
2013-04-15AD76936ND
2013-04-15AD76937ND
2013-04-15AD76938ND
2013-04-15AD76939ND
2013-04-15AD76940ND
2013-04-19201083692ND
2013-04-1920108369314.2 ppb
2013-04-19201083694ND
2013-04-192010836950.530 ppb
2013-04-192010836960.500 ppb
2013-04-19201083697ND
2013-04-19201083692ND
2013-04-1920108369314.2 ppb
2013-04-19201083694ND
2013-04-192010836950.530 ppb
2013-04-192010836960.500 ppb
2013-04-19201083697ND
2013-04-29AD77252ND
2013-04-29AD77252ND
2013-07-22201108878ND
2013-07-222011088791.000 ppb
2013-07-222011088800.710 ppb
2013-07-222011088810.550 ppb
2013-07-222011088829.80 ppb
2013-07-22201108883ND
2013-07-22201108878ND
2013-07-222011088791.000 ppb
2013-07-222011088800.710 ppb
2013-07-222011088810.550 ppb
2013-07-222011088829.80 ppb
2013-07-22201108883ND
2013-09-09AD83644ND
2013-09-09AD83644ND
2013-10-18201136589ND
2013-10-1820113659010.5 ppb
2013-10-18201136591ND
2013-10-18201136592ND
2013-10-18201136593ND
2013-10-18201136594ND
2013-10-18201136589ND
2013-10-1820113659010.5 ppb
2013-10-18201136591ND
2013-10-18201136592ND
2013-10-18201136593ND
2013-10-18201136594ND
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