Silver
Norwich Public Utilities
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.
24
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 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-05-01 | 6299962IOC1 | ND |
| 2014-05-01 | 6299964IOCR | ND |
| 2014-05-01 | 6299965IOCR | ND |
| 2014-05-01 | 6299961IOC1 | ND |
| 2015-05-01 | 6300938IOC1 | ND |
| 2015-05-01 | 6300939IOC1 | ND |
| 2015-05-01 | 6300941IOCR | ND |
| 2015-05-01 | 6300942IOCR | ND |
| 2016-11-17 | 6302605IOCR | ND |
| 2016-11-17 | 6302604IOCR | ND |
| 2016-11-17 | 6302601IOC1 | ND |
| 2016-11-17 | 6302600IOC1 | ND |
| 2016-11-17 | 6302599IOC1 | ND |
| 2017-07-06 | PH-0453-6303180I | ND |
| 2017-07-06 | PH-0453-6303181I | ND |
| 2018-08-20 | PH-0453-6304413I | ND |
| 2018-08-20 | PH-0453-6304414I | ND |
| 2018-08-20 | PH-0453-6304416I | ND |
| 2018-08-20 | PH-0453-6304417I | ND |
| 2019-08-29 | PH-0453-6305529I | ND |
| 2019-08-29 | PH-0453-6305531I | ND |
| 2019-08-29 | PH-0453-6305532I | ND |
| 2019-09-19 | PH-0453-6305530I | ND |
| 2019-11-07 | PH-0453-6305533I | ND |