Silver
Columbia Heights 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.
12
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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 8 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 25.0 ppb | 4 | 3 | ND - 45.0 ppb |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2019-03-25 | 35457368001 | ND |
| 2019-03-25 | 35457368002 | ND |
| 2019-03-25 | 35457368003 | ND |
| 2019-03-25 | 35457368001 | ND |
| 2019-03-25 | 35457368002 | ND |
| 2019-03-25 | 35457368003 | ND |
| 2019-06-19 | 35477220001 | ND |
| 2019-06-19 | 35477220001 | ND |
| 2022-03-29 | B2201642-001 | 43.0 ppb |
| 2022-03-29 | B2201642-002 | 45.0 ppb |
| 2022-03-29 | B2201642-003 | 12.0 ppb |
| 2022-03-29 | B2201642-004 | ND |