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EWG's Tap Water Database

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Silver

Grayson Utility Commission

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND20ND
2011ND20ND
201210.00 ppb1110.00 ppb
2013ND10ND
2014ND10ND
2015ND20ND

ppb = parts per billion.

All test results

Date Lab ID Result
2010-03-02201002238001ND
2010-09-07201009134001ND
2011-03-22201103145001ND
2011-09-13201110674001ND
2012-03-1320120296300110.00 ppb
2013-03-19201303442001ND
2014-03-04201403039001ND
2015-03-0320182504001ND
2015-03-03201502504001ND