Silver
Holliston Water 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.
16
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
All test results
| Date | Result |
|---|---|
| 2015-10-13 | ND |
| 2015-10-13 | ND |
| 2015-10-13 | ND |
| 2015-10-13 | ND |
| 2017-08-15 | ND |
| 2017-08-15 | ND |
| 2017-08-15 | ND |
| 2017-08-30 | ND |
| 2018-09-25 | ND |
| 2018-09-25 | ND |
| 2018-09-25 | ND |
| 2018-09-25 | ND |
| 2019-11-22 | ND |
| 2019-11-22 | ND |
| 2019-11-22 | ND |
| 2019-12-16 | ND |