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EWG's Tap Water Database — 2019 UPDATE

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Silver

Contra Costa Water District

Silver occurs naturally in surface and groundwater and can be added to water as a biocide that inhibits growth of bacteria and algae. Increasingly, the use of antimicrobial nano-sized silver particles in consumer products contributes to silver in water sources used for drinking water.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
2014ND20ND
2015ND10ND
2016ND10ND
2017ND20ND

ppb = parts per billion

All test results

Date Lab ID Result
2012-07-092473-003-0800ND
2013-07-159590-003-1345ND
2014-07-079590-003-1455ND
2014-07-219590-019-1330ND
2015-07-069590-003-0815ND
2016-07-119590-003-1350ND
2017-07-109590-003-1450ND
2017-12-199590-003-1330ND