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EWG's Tap Water Database — 2019 UPDATE

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Bromide

Contra Costa Water District

Bromide is a naturally occurring element found in surface waters and groundwater. During drinking water treatment, bromide can combine with chlorine or other disinfectants, contributing to the formation of toxic tap water disinfection byproducts.

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201260.0 ppb103ND - 300.0 ppb
201377.5 ppb124ND - 300.0 ppb
2014175.0 ppb1211ND - 400.0 ppb
2015190.9 ppb1111100.0 ppb - 300.0 ppb
2016N/A00N/A
2017N/A00N/A

ppb = parts per billion

All test results

Date Lab ID Result
2012-04-192473-003-0830ND
2012-05-152473-003-1050200.0 ppb
2012-06-122473-003-1030ND
2012-07-092473-003-0800ND
2012-07-172473-003-1215ND
2012-08-142473-003-1035ND
2012-09-112473-003-1155ND
2012-10-092473-003-1020ND
2012-11-132473-003-0815100.0 ppb
2012-12-042473-003-1330300.0 ppb
2013-03-202473-003-1250ND
2013-04-092473-003-1035ND
2013-05-142473-003-1245200.0 ppb
2013-06-112473-003-1400ND
2013-07-152473-003-1345ND
2013-07-162473-003-1000ND
2013-08-132473-003-1140ND
2013-09-102473-003-1254ND
2013-09-112473-019-1425ND
2013-10-152473-003-1300200.0 ppb
2013-11-122473-003-0800300.0 ppb
2013-12-109590-003-0800230.0 ppb
2014-03-102473-003-1119200.0 ppb
2014-04-152473-003-0810200.0 ppb
2014-05-132473-003-1255100.0 ppb
2014-06-102473-003-0755100.0 ppb
2014-07-152473-003-1255200.0 ppb
2014-07-212473-019-1330ND
2014-07-222473-003-1345200.0 ppb
2014-08-122473-003-1454200.0 ppb
2014-09-092473-003-1255400.0 ppb
2014-10-142473-003-0830200.0 ppb
2014-11-182473-003-0830100.0 ppb
2014-12-022473-003-1345200.0 ppb
2015-03-182473-003-1427200.0 ppb
2015-04-142473-003-1335100.0 ppb
2015-05-122473-003-0821200.0 ppb
2015-06-092473-003-1341200.0 ppb
2015-07-062473-003-0815200.0 ppb
2015-07-142473-003-1400200.0 ppb
2015-08-112473-003-0955200.0 ppb
2015-09-152473-003-1200200.0 ppb
2015-10-132473-003-0900200.0 ppb
2015-11-102473-003-0945100.0 ppb
2015-12-082473-003-0900300.0 ppb