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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Northwest Harris County Municipal Utility District 23

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

 

26

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.250 ppb21ND - 0.500 ppb
2015ND50ND
2016ND50ND
2017ND50ND
2018ND50ND
2019ND40ND

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
2014-04-30AC523620.500 ppb
2014-05-21AC54937ND
2015-02-12AC80441ND
2015-05-05AC90544ND
2015-05-05AC90498ND
2015-09-03AD05660ND
2015-11-12AD13388ND
2016-02-04AD22165ND
2016-04-28AD34644ND
2016-09-22AD50760ND
2016-09-22AD50823ND
2016-11-08AD57113ND
2017-01-12AD64732ND
2017-04-12AD79463ND
2017-06-07AD86733ND
2017-07-13AD89325ND
2017-10-17AE01089ND
2018-01-11AE08956ND
2018-05-17AE26815ND
2018-05-17AE26749ND
2018-07-12AE33153ND
2018-10-09AE42952ND
2019-01-31AE52467ND
2019-05-14AE66191ND
2019-09-25AE84642ND
2019-11-07AE88933ND