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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Issaquah Water System

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.

 

100

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.591 ppb228ND - 2.60 ppb
20130.106 ppb163ND - 0.600 ppb
2014ND160ND
2015ND140ND
2016ND160ND
2017ND160ND

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
2012-02-0604372ND
2012-02-0604369ND
2012-02-06043711.60 ppb
2012-02-06043702.00 ppb
2012-02-0604373ND
2012-02-0604375ND
2012-02-0604374ND
2012-02-0604376ND
2012-02-06043772.60 ppb
2012-02-06043682.00 ppb
2012-02-06043782.30 ppb
2012-02-06043791.50 ppb
2012-05-0716665ND
2012-05-0716664ND
2012-08-0630371ND
2012-08-0630372ND
2012-08-0630373ND
2012-08-0630374ND
2012-11-05444240.500 ppb
2012-11-0544426ND
2012-11-05444230.500 ppb
2012-11-0544425ND
2013-02-0404600ND
2013-02-0404597ND
2013-02-0404598ND
2013-02-0404599ND
2013-05-0617870ND
2013-05-0617873ND
2013-05-0617872ND
2013-05-0617871ND
2013-08-0532183ND
2013-08-0532184ND
2013-08-0532182ND
2013-08-0532181ND
2013-11-04475550.600 ppb
2013-11-0447553ND
2013-11-04475560.500 ppb
2013-11-04475540.600 ppb
2014-02-0304960ND
2014-02-0304962ND
2014-02-0304963ND
2014-02-0304961ND
2014-05-0518966ND
2014-05-0518967ND
2014-05-0518964ND
2014-05-0518965ND
2014-08-0433736ND
2014-08-0433734ND
2014-08-0433737ND
2014-08-0433735ND
2014-11-0349038ND
2014-11-0349037ND
2014-11-0349040ND
2014-11-0349039ND
2015-02-0204745ND
2015-02-0204744ND
2015-02-0204743ND
2015-02-0204746ND
2015-05-0419259ND
2015-05-0419258ND
2015-05-0419260ND
2015-05-0419257ND
2015-08-0335337ND
2015-08-0335338ND
2015-08-0335339ND
2015-08-0335336ND
2015-09-1644717ND
2015-09-1644716ND
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-05-02ND
2016-05-02ND
2016-05-02ND
2016-05-02ND
2016-08-01ND
2016-08-01ND
2016-08-01ND
2016-08-01ND
2016-11-07ND
2016-11-07ND
2016-11-07ND
2016-11-07ND
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-05-01ND
2017-05-01ND
2017-05-01ND
2017-05-01ND
2017-08-10ND
2017-08-10ND
2017-08-10ND
2017-08-10ND
2017-11-06ND
2017-11-06ND
2017-11-06ND
2017-11-06ND