Silver
Alderwood Water District
NOTE: Alderwood Water District purchases water from City of Everett Public Works Department which is required to test for silver. Sample information shown below was taken by City of Everett Public Works Department.
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
All test results
NOTE: Alderwood Water District purchases water from City of Everett Public Works Department which is required to test for silver. Sample information shown below was taken by City of Everett Public Works Department.
| Date | Lab ID | Result |
|---|---|---|
| 2014-11-05 | 57678 | ND |
| 2015-05-04 | 59304 | ND |
| 2016-05-09 | ND | |
| 2017-05-02 | ND | |
| 2018-05-01 | ND | |
| 2019-05-08 | ND |