Silver
City of Petaluma
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.
23
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-09-16 | 1610-012-1330 | ND |
| 2015-01-29 | 1610-057-1430 | ND |
| 2015-02-10 | 1610-057-1330 | ND |
| 2015-02-12 | 1610-057-1320 | ND |
| 2015-06-18 | 1610-031-1300 | ND |
| 2015-06-18 | 1610-009-0915 | ND |
| 2015-09-23 | 1610-032-1120 | ND |
| 2016-03-09 | 1610-026-1045 | ND |
| 2016-03-09 | 1610-027-1105 | ND |
| 2016-06-22 | 1610-028-1100 | ND |
| 2016-09-22 | 1610-051-1120 | ND |
| 2016-12-07 | 1610-055-1220 | ND |
| 2018-03-07 | 1610-057-0900 | ND |
| 2018-06-06 | 1610-031-1020 | ND |
| 2018-06-06 | 1610-030-1150 | ND |
| 2018-06-06 | 1610-010-0845 | ND |
| 2018-06-06 | 1610-009-0830 | ND |
| 2018-09-13 | 1610-032-1130 | ND |
| 2018-11-07 | 1610-012-0830 | ND |
| 2019-03-13 | 1610-051-1058 | ND |
| 2019-03-13 | 1610-055-1108 | ND |
| 2019-03-13 | 1610-027-0910 | ND |
| 2019-03-13 | 1610-026-1008 | ND |