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.
21
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 | ND | 4 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-08-20 | PH-0453-6304414IOC1 | ND |
| 2018-08-20 | PH-0453-6304416IOCR | ND |
| 2018-08-20 | PH-0453-6304417IOCR | ND |
| 2018-08-20 | PH-0453-6304413IOC1 | ND |
| 2019-08-29 | PH-0453-6305529IOC1 | ND |
| 2019-08-29 | PH-0453-6305531IOC1 | ND |
| 2019-08-29 | PH-0453-6305532IOCR | ND |
| 2019-09-19 | PH-0453-6305530IOC1 | ND |
| 2019-11-07 | PH-0453-6305533IOCR | ND |
| 2020-06-10 | PH-0453-6306357IOC1 | ND |
| 2020-06-10 | PH-0453-6306433IOCR | ND |
| 2020-06-10 | PH-0453-6306432IOCR | ND |
| 2020-06-10 | PH-0453-6306358IOC1 | ND |
| 2020-06-10 | PH-0453-6306356IOC1 | ND |
| 2021-05-24 | PH-0453-6307275IOC1 | ND |
| 2021-05-24 | PH-0453-6307278IOCR | ND |
| 2022-01-13 | PH-0453-6307955IOC1 | ND |
| 2022-01-13 | PH-0453-6307958IOCR | ND |
| 2022-11-21 | PH-0453-6307956IOC1 | ND |
| 2023-11-14 | D3K1545-01IOC | ND |
| 2023-11-14 | D3K1545-02IOC | ND |