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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Waunakee Waterworks

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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

 

35

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.200 ppb82ND - 0.960 ppb
20150.183 ppb62ND - 0.680 ppb
20160.0767 ppb31ND - 0.230 ppb
20170.0713 ppb81ND - 0.570 ppb
2018ND60ND
20190.108 ppb41ND - 0.430 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-02-10769678ND
2014-02-10769683ND
2014-02-10769686ND
2014-02-10769680ND
2014-04-16780796ND
2014-04-16780797ND
2014-07-108022640.640 ppb
2014-07-108022630.960 ppb
2015-03-10847412ND
2015-05-04858130ND
2015-07-158711930.420 ppb
2015-07-158711920.680 ppb
2015-07-27873353ND
2015-10-05887254ND
2016-08-16940120ND
2016-08-16940119ND
2016-08-169401180.230 ppb
2017-01-31971660ND
2017-01-31971656ND
2017-02-06972337ND
2017-04-11982557ND
2017-07-111003165ND
2017-07-111003167ND
2017-07-1110031660.570 ppb
2017-10-031022337ND
2018-01-311039288ND
2018-04-031048174ND
2018-07-111066417ND
2018-07-111066420ND
2018-07-111066419ND
2018-10-081085741ND
2019-07-011131600ND
2019-07-021132035ND
2019-07-0211320930.430 ppb
2019-12-021162821ND