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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Madison Water Department

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

106

Samples

0

Samples exceeding legal limit (MCL)

30

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.209 ppb204ND - 1.35 ppb
20150.531 ppb168ND - 1.80 ppb
20160.413 ppb166ND - 1.96 ppb
20170.302 ppb167ND - 0.985 ppb
20180.0631 ppb222ND - 0.855 ppb
20190.103 ppb163ND - 0.560 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-03-03AB47857TH0.589 ppb
2014-03-03AB47856THND
2014-03-03AB47858THND
2014-03-03AB47855THND
2014-06-03AB51640THND
2014-06-03AB51639THND
2014-06-03AB51641THND
2014-06-03AB51638THND
2014-09-03L5211811-3ND
2014-09-03L5211811-2ND
2014-09-03L5211811-41.15 ppb
2014-09-03L5211811-1ND
2014-09-03L5211814-2ND
2014-09-03L5211814-4ND
2014-09-09L5240310-2ND
2014-09-09L5240310-4ND
2014-12-02AB59055THND
2014-12-02AB59054TH1.35 ppb
2014-12-02AB59056TH1.10 ppb
2014-12-02AB59053THND
2015-03-04AB62616THND
2015-03-04AB62614TH1.01 ppb
2015-03-04AB62617TH0.600 ppb
2015-03-04AB62615THND
2015-06-16AB67019THND
2015-06-16AB67017TH0.521 ppb
2015-06-16AB67020TH1.47 ppb
2015-06-16AB67018THND
2015-09-08AB70875TH0.635 ppb
2015-09-08AB70873THND
2015-09-08AB70872THND
2015-09-08AB70874THND
2015-12-08AB74635TH0.900 ppb
2015-12-08AB74634TH1.80 ppb
2015-12-08AB74633TH1.56 ppb
2015-12-08AB74636THND
2016-03-08AB78061THND
2016-03-08AB78060TH1.84 ppb
2016-03-08AB78059TH0.810 ppb
2016-03-08AB78062THND
2016-06-14AB82524THND
2016-06-14AB82523THND
2016-06-14AB82522TH1.96 ppb
2016-06-14AB82525THND
2016-09-12AB86394THND
2016-09-12AB86395THND
2016-09-12AB86397TH0.595 ppb
2016-09-12AB86396THND
2016-12-13AB90417THND
2016-12-13AB90418TH0.655 ppb
2016-12-13AB90420TH0.752 ppb
2016-12-13AB90419THND
2017-03-13AB93937THND
2017-03-13AB93940THND
2017-03-13AB93938TH0.985 ppb
2017-03-13AB93939THND
2017-06-20AB97881THND
2017-06-20AB97883TH0.789 ppb
2017-06-20AB97882TH0.504 ppb
2017-06-20AB97880THND
2017-09-12AC01270THND
2017-09-12AC01271TH0.812 ppb
2017-09-12AC01269TH0.572 ppb
2017-09-12AC01272THND
2017-12-12AC04941THND
2017-12-12AC04942TH0.561 ppb
2017-12-12AC04939TH0.608 ppb
2017-12-12AC04940THND
2018-02-13JC60783-2ND
2018-02-13JC60783-4ND
2018-03-15AC08550THND
2018-03-15AC08551THND
2018-03-15AC08549TH0.533 ppb
2018-03-15AC08552THND
2018-04-10JC64164-1ND
2018-04-10JC64164-4ND
2018-04-10JC64164-3ND
2018-04-10JC64164-2ND
2018-06-22AC12529THND
2018-06-22AC12527THND
2018-06-22AC12528THND
2018-06-22AC12526THND
2018-09-17AC16244THND
2018-09-17AC16246TH0.855 ppb
2018-09-17AC16247THND
2018-09-17AC16245THND
2018-12-06AC19718THND
2018-12-06AC19717THND
2018-12-06AC19716THND
2018-12-06AC19715THND
2019-03-07AC23585THND
2019-03-07AC23586THND
2019-03-07AC23588TH0.560 ppb
2019-03-07AC23587THND
2019-06-06AC27598THND
2019-06-06AC27599THND
2019-06-06AC27597TH0.560 ppb
2019-06-06AC27600THND
2019-09-09AC32085THND
2019-09-09AC32087THND
2019-09-09AC32088THND
2019-09-09AC32086THND
2019-12-05AC36038THND
2019-12-05AC36039THND
2019-12-05AC36041TH0.520 ppb
2019-12-05AC36040THND