Silver
CTWC - Unionville System
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for silver. Sample information shown below was taken by Metropolitan District Commission.
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 | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
ppb = parts per billion
All test results
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for silver. Sample information shown below was taken by Metropolitan District Commission.
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-18 | AE01630GE | ND |
| 2018-07-18 | AE01632GE | ND |
| 2018-07-18 | AE01640GE | ND |
| 2018-07-18 | AE01641GE | ND |
| 2018-07-18 | AE01637GE | ND |
| 2018-07-18 | AE01636GE | ND |
| 2018-07-18 | AE01631GE | ND |
| 2019-12-03 | CE70734 | ND |
| 2019-12-03 | CE70735 | ND |
| 2019-12-03 | CE70736 | ND |
| 2019-12-03 | CE70733 | ND |
| 2019-12-03 | CE70741 | ND |
| 2019-12-03 | CE70739 | ND |
| 2019-12-03 | CE70740 | ND |
| 2020-12-08 | IOC1 200600637 | ND |
| 2020-12-08 | IOC1 200600611 | ND |
| 2020-12-08 | IOCR 200600614 | ND |
| 2020-12-08 | IOCR 200600615 | ND |
| 2020-12-08 | IOCR 200600616 | ND |
| 2020-12-08 | IOCR 200600617 | ND |
| 2020-12-09 | IOC1 200600603 | ND |
| 2021-11-23 | E300107450 300107454 | ND |
| 2021-11-23 | I300107476 300107479 | ND |
| 2021-11-23 | E300107451 300107460 | ND |
| 2021-11-29 | E300109635 300109640 | ND |
| 2021-11-29 | I300109610 300109613 | ND |
| 2021-11-30 | I300109649 300109653 | ND |
| 2021-11-30 | I300109650 300109659 | ND |
| 2022-12-08 | I300283837 300283842 | ND |
| 2022-12-08 | 300283822 300283827B | ND |
| 2022-12-15 | E300287100 300287104 | ND |
| 2022-12-15 | I300287081 300287086 | ND |
| 2022-12-15 | I300287109 300287112 | ND |
| 2022-12-15 | E300287072 300287076 | ND |
| 2022-12-15 | E300287053 300287057 | ND |
| 2023-12-05 | E300456248 300456251 | ND |
| 2023-12-05 | I300456268 300456271 | ND |
| 2023-12-05 | I300456261 300456264 | ND |
| 2023-12-05 | I300456281 300456284 | ND |
| 2023-12-06 | E300456222 300456225 | ND |
| 2023-12-06 | E300456228 300456231 | ND |
| 2023-12-06 | I300456234 300456237 | ND |