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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 2 | 0 | ND |
2015 | ND | 1 | 0 | ND |
2016 | ND | 1 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 1 | 0 | ND |
2019 | ND | 2 | 0 | ND |
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2014-07-07 | 9590-003-1455 | ND |
2014-07-21 | 9590-019-1330 | ND |
2015-07-06 | 9590-003-0815 | ND |
2016-07-11 | 9590-003-1350 | ND |
2017-07-10 | 9590-003-1450 | ND |
2017-12-19 | 9590-003-1330 | ND |
2018-07-16 | 1644-003-1245 | ND |
2019-07-08 | 1644-003-1206 | ND |
2019-07-08 | 1644-804-1050 | ND |