Silver
San Lorenzo Valley Water District
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.
13
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 | 7 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2015-08-05 | 9590-023-1430 | ND |
| 2015-08-05 | 9590-024-1500 | ND |
| 2015-08-05 | 9590-034-1445 | ND |
| 2015-08-19 | 9590-010-1400 | ND |
| 2015-08-19 | 9590-022-1415 | ND |
| 2015-08-19 | 9590-025-1445 | ND |
| 2015-08-19 | 9590-026-1500 | ND |
| 2018-07-05 | 9590-025-1030 | ND |
| 2018-07-05 | 9590-026-1000 | ND |
| 2018-07-05 | 9590-034-0915 | ND |
| 2018-07-18 | 9590-010-1030 | ND |
| 2018-07-18 | 9590-022-1045 | ND |
| 2018-08-14 | 9590-024-0830 | ND |