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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Washington Water Authority WWA

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

49

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.81 ppb16161.000 ppb - 2.40 ppb
20151.01 ppb1611ND - 2.00 ppb
20160.600 ppb166ND - 2.10 ppb
20170.569 ppb167ND - 1.60 ppb
20180.331 ppb165ND - 1.10 ppb
20190.408 ppb124ND - 1.40 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
2014-02-18140510109021.60 ppb
2014-02-18140510106021.70 ppb
2014-02-18140510108022.10 ppb
2014-02-18140510107022.20 ppb
2014-05-05141280140021.10 ppb
2014-05-05141280143021.20 ppb
2014-05-05141280142021.000 ppb
2014-05-05141280141021.20 ppb
2014-08-06142190033021.90 ppb
2014-08-06142190032022.40 ppb
2014-08-06142190057022.30 ppb
2014-08-13142270005022.10 ppb
2014-10-29143040015022.40 ppb
2014-10-29143040016022.30 ppb
2014-10-29143040017022.00 ppb
2014-10-29143040018021.50 ppb
2015-01-27150290036021.90 ppb
2015-01-27150290035021.90 ppb
2015-01-27150290034022.00 ppb
2015-01-27150290037021.60 ppb
2015-04-28151200074021.20 ppb
2015-04-28151200075021.30 ppb
2015-04-2815120007702ND
2015-04-28151200076021.10 ppb
2015-07-3015212003702ND
2015-07-3015212003402ND
2015-07-3015212003502ND
2015-07-3015212003602ND
2015-10-27153030016021.40 ppb
2015-10-27153030015021.40 ppb
2015-10-27153030017021.30 ppb
2015-10-27153030018021.10 ppb
2016-01-2616029004602ND
2016-01-2616029004802ND
2016-01-2616029004902ND
2016-01-2616029004702ND
2016-04-2616119008202ND
2016-04-2616119008302ND
2016-04-2616119008402ND
2016-04-2616119008502ND
2016-07-2616210003902ND
2016-07-26162100040021.000 ppb
2016-07-26162100038021.20 ppb
2016-07-2616210004102ND
2016-10-26163010053022.00 ppb
2016-10-26163010054021.90 ppb
2016-10-26163010052022.10 ppb
2016-10-26163010055021.40 ppb
2017-01-2617027001602ND
2017-01-2617027001302ND
2017-01-26170270015021.30 ppb
2017-01-2617027001402ND
2017-04-17171100061021.60 ppb
2017-04-17171100060021.40 ppb
2017-04-17171100062021.40 ppb
2017-04-17171100063021.40 ppb
2017-07-1917202001702ND
2017-07-1917202001602ND
2017-07-1917202001502ND
2017-07-1917202001402ND
2017-10-1817293003702ND
2017-10-1817293003602ND
2017-10-18172930035021.000 ppb
2017-10-18172930034021.000 ppb
2018-02-1418046006302ND
2018-02-1418046006402ND
2018-02-1418046006502ND
2018-02-1418046006602ND
2018-04-2418116006402ND
2018-04-2418116006602ND
2018-04-2418116006302ND
2018-04-2418116006502ND
2018-07-23182070099021.10 ppb
2018-07-23182070098021.000 ppb
2018-07-23182070100021.10 ppb
2018-07-2318207009702ND
2018-10-2418298010402ND
2018-10-2418298010102ND
2018-10-24182980102021.10 ppb
2018-10-24182980103021.000 ppb
2019-01-30190310128021.20 ppb
2019-01-30190310126021.20 ppb
2019-01-30190310127021.40 ppb
2019-01-31190310129021.10 ppb
2019-04-1719109001002ND
2019-04-1719109000902ND
2019-04-1719109000702ND
2019-04-1719109000802ND
2019-07-1619199007902ND
2019-07-1619199008102ND
2019-07-1619199008202ND
2019-07-1619199008002ND