Silver
City of Tacoma
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.
19
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 3 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-10-18 | ND | |
| 2019-12-05 | ND | |
| 2021-06-21 | 4136300 | ND |
| 2021-06-21 | 4136298 | ND |
| 2021-06-21 | 4136297 | ND |
| 2021-06-21 | 4136296 | ND |
| 2021-06-30 | 4143413 | ND |
| 2021-07-21 | 4159325 | ND |
| 2022-09-15 | 4371197 | ND |
| 2022-10-11 | 4371889 | ND |
| 2022-11-15 | 4384533 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2023-07-12 | 4499689 | ND |
| 2023-07-12 | 4499687 | ND |
| 2023-10-20 | 4549137 | ND |