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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Issaquah Water System

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

 

98

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND160ND
2015ND140ND
2016ND160ND
2017ND160ND
2018ND180ND
2019ND180ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-02-0304962ND
2014-02-0304960ND
2014-02-0304961ND
2014-02-0304963ND
2014-05-0518966ND
2014-05-0518965ND
2014-05-0518964ND
2014-05-0518967ND
2014-08-0433735ND
2014-08-0433734ND
2014-08-0433737ND
2014-08-0433736ND
2014-11-0349039ND
2014-11-0349038ND
2014-11-0349037ND
2014-11-0349040ND
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
2015-08-0335336ND
2015-08-0335339ND
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
2018-02-05ND
2018-02-05ND
2018-02-05ND
2018-02-05ND
2018-05-07ND
2018-05-07ND
2018-05-07ND
2018-05-07ND
2018-05-29ND
2018-05-29ND
2018-08-06ND
2018-08-06ND
2018-08-06ND
2018-08-06ND
2018-11-07ND
2018-11-07ND
2018-11-07ND
2018-11-07ND
2019-01-14ND
2019-01-14ND
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-05-06ND
2019-05-06ND
2019-05-06ND
2019-05-06ND
2019-08-06ND
2019-08-06ND
2019-08-06ND
2019-08-06ND
2019-11-04ND
2019-11-04ND
2019-11-04ND
2019-11-04ND