Silver
City of Tumwater
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 |
---|---|---|---|---|
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 1 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | 0.667 ppb | 3 | 2 | ND - 1.000 ppb |
2019 | ND | 3 | 0 | ND |
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2015-07-01 | 29730 | ND |
2018-08-28 | ND | |
2018-08-28 | 1.000 ppb | |
2018-08-28 | 1.000 ppb | |
2019-08-28 | ND | |
2019-08-28 | ND | |
2019-08-28 | ND |