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EWG's Tap Water Database — 2019 UPDATE

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Silver

San Francisco Regional Water System

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND30ND
2015ND30ND
2016ND30ND
2017ND30ND

ppb = parts per billion

All test results

Date Lab ID Result
2012-06-139553-001-1045ND
2012-06-139553-015-1220ND
2012-07-249553-016-0915ND
2013-06-189553-016-0936ND
2013-06-189553-001-1110ND
2013-10-079553-015-1024ND
2014-06-179553-001-1130ND
2014-06-179553-016-0904ND
2014-09-169553-015-1035ND
2015-05-279553-001-1235ND
2015-05-279553-016-0830ND
2015-06-189553-015-0915ND
2016-06-149553-015-1231ND
2016-06-149553-001-1105ND
2016-06-219553-016-1055ND
2017-06-199553-015-1100ND
2017-06-199553-001-1025ND
2017-06-199553-016-0953ND