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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Port Townsend City Of

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

 

88

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.283 ppb62ND - 0.900 ppb
20150.281 ppb168ND - 0.700 ppb
2016ND160ND
20170.0611 ppb182ND - 0.600 ppb
20180.200 ppb164ND - 0.900 ppb
2019ND160ND

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
2014-02-1807303ND
2014-02-1807304ND
2014-08-0634523ND
2014-08-0634524ND
2014-11-05497590.800 ppb
2014-11-05497600.900 ppb
2015-02-0405322ND
2015-02-0405321ND
2015-02-1707120ND
2015-02-1707119ND
2015-05-1822636ND
2015-05-1822637ND
2015-05-1822635ND
2015-05-1822634ND
2015-08-11374870.600 ppb
2015-08-11374880.500 ppb
2015-08-11374890.500 ppb
2015-08-11374860.500 ppb
2015-11-04533050.600 ppb
2015-11-04533060.700 ppb
2015-11-04533040.500 ppb
2015-11-04533030.600 ppb
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-05-04ND
2016-05-04ND
2016-05-04ND
2016-05-04ND
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-11-08ND
2016-11-08ND
2016-11-08ND
2016-11-08ND
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-03-14ND
2017-03-14ND
2017-05-17ND
2017-05-17ND
2017-05-17ND
2017-05-17ND
2017-08-02ND
2017-08-02ND
2017-08-02ND
2017-08-02ND
2017-11-060.500 ppb
2017-11-06ND
2017-11-060.600 ppb
2017-11-06ND
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-05-08ND
2018-05-08ND
2018-05-08ND
2018-05-08ND
2018-08-13ND
2018-08-13ND
2018-08-13ND
2018-08-13ND
2018-11-050.900 ppb
2018-11-050.700 ppb
2018-11-050.700 ppb
2018-11-050.900 ppb
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-05-06ND
2019-05-06ND
2019-05-06ND
2019-05-06ND
2019-08-05ND
2019-08-05ND
2019-08-05ND
2019-08-05ND
2019-10-04ND
2019-11-04ND
2019-11-04ND
2019-11-04ND