Silver
Mill River Water District
NOTE: Mill River Water District purchases water from New Castle/Stanwood WD which is required to test for silver. Sample information shown below was taken by New Castle/Stanwood WD.
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 |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
All test results
NOTE: Mill River Water District purchases water from New Castle/Stanwood WD which is required to test for silver. Sample information shown below was taken by New Castle/Stanwood WD.
| Date | Lab ID | Result |
|---|---|---|
| 2018-10-16 | AU22444-INS | ND |
| 2018-12-05 | AU26061-INS | ND |
| 2019-10-01 | AV20755-INS | ND |
| 2019-12-19 | AV26488-INS | ND |
| 2020-05-13 | AW08856-INS | ND |
| 2020-10-06 | AW19369-INS | ND |
| 2020-10-21 | AW20411-INS | ND |
| 2020-10-21 | AW20413-INS | ND |
| 2021-05-27 | AX10204-INS | ND |
| 2021-06-04 | 70175719001-INS | ND |
| 2021-10-13 | AX20798-INS | ND |
| 2021-10-14 | AX20887-INS | ND |
| 2021-11-29 | AX23648-INS | ND |
| 2022-06-09 | AY09842-INS | ND |
| 2022-11-01 | AY19672-INS | ND |
| 2022-11-01 | AY19670-SEC | ND |
| 2022-11-14 | AY20530-INS | ND |
| 2023-06-20 | AZ10986-INS | ND |
| 2023-10-17 | AZ19198-INS | ND |
| 2023-10-17 | AZ19196-INS | ND |
| 2023-12-21 | AZ23023-INS | ND |