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EWG's Tap Water Database — 2019 UPDATE

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Bromodichloromethane

Harris County MUD 165

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

26

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND30ND
20140.675 ppb43ND - 1.20 ppb
20150.456 ppb93ND - 1.60 ppb
2016ND50ND
20170.220 ppb51ND - 1.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2013-06-13AC22099ND
2013-06-13AC22029ND
2013-06-13AC22097ND
2014-07-16AC59896ND
2014-07-16AC598901.20 ppb
2014-07-16AC598430.700 ppb
2014-07-16AC598470.800 ppb
2015-05-27AC934921.40 ppb
2015-05-27AC93485ND
2015-05-27AC93425ND
2015-05-27AC93397ND
2015-05-27AC93395ND
2015-09-09AD062571.10 ppb
2015-09-09AD06255ND
2015-11-10AD131881.60 ppb
2015-11-10AD13186ND
2016-03-21AD29673ND
2016-03-21AD29633ND
2016-03-21AD29639ND
2016-09-26AD51032ND
2016-09-26AD51035ND
2017-05-04AD827331.10 ppb
2017-05-04AD82713ND
2017-05-04AD82785ND
2017-05-04AD82787ND
2017-05-04AD82793ND