Silver

City of San Diego

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	ND	12	ND
2015	ND	12	ND
2016	ND	11	ND
2017	ND	12	ND
2018	ND	15	ND
2019	ND	10	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-03	9437-010-0000	ND
2014-02-03	9437-006-0000	ND
2014-02-03	9437-001-0000	ND
2014-05-05	9437-010-0000	ND
2014-05-05	9437-006-0000	ND
2014-05-05	9437-001-0000	ND
2014-08-04	9437-010-0000	ND
2014-08-04	9437-006-0000	ND
2014-08-04	9437-001-0000	ND
2014-11-03	9437-010-0000	ND
2014-11-03	9437-006-0000	ND
2014-11-03	9437-001-0000	ND
2015-02-02	9437-006-0000	ND
2015-02-02	9437-010-0000	ND
2015-02-02	9437-001-0000	ND
2015-05-04	9437-010-0000	ND
2015-05-04	9437-006-0000	ND
2015-05-04	9437-001-0000	ND
2015-08-03	9437-001-0000	ND
2015-08-03	9437-010-0000	ND
2015-08-03	9437-006-0000	ND
2015-11-02	9437-001-0000	ND
2015-11-02	9437-006-0000	ND
2015-11-02	9437-010-0000	ND
2016-02-01	9437-006-0000	ND
2016-02-01	9437-010-0000	ND
2016-02-01	9437-001-0000	ND
2016-05-02	9437-010-0000	ND
2016-05-02	9437-001-0000	ND
2016-08-01	9437-001-0000	ND
2016-08-01	9437-010-0000	ND
2016-08-01	9437-006-0000	ND
2016-11-07	9437-010-0000	ND
2016-11-07	9437-001-0000	ND
2016-11-07	9437-006-0000	ND
2017-02-06	9437-001-0000	ND
2017-02-06	9437-006-0000	ND
2017-02-22	9437-010-0000	ND
2017-05-01	9437-001-0000	ND
2017-05-01	9437-010-0000	ND
2017-06-05	9437-006-0000	ND
2017-08-07	9437-006-0000	ND
2017-08-07	9437-001-0000	ND
2017-08-07	9437-010-0000	ND
2017-11-06	9437-006-0000	ND
2017-11-06	9437-010-0000	ND
2017-11-06	9437-001-0000	ND
2018-01-24	9437-030-0000	ND
2018-02-05	9437-010-0000	ND
2018-02-05	9437-001-0000	ND
2018-02-05	9437-006-0000	ND
2018-05-07	9437-010-0000	ND
2018-05-07	9437-006-0000	ND
2018-05-07	9437-001-0000	ND
2018-05-09	9437-030-0000	ND
2018-08-06	9437-010-0000	ND
2018-08-06	9437-001-0000	ND
2018-08-06	9437-006-0000	ND
2018-09-05	9437-030-0000	ND
2018-11-05	9437-001-0000	ND
2018-11-05	9437-006-0000	ND
2018-11-30	9437-010-0000	ND
2019-02-04	9437-010-0000	ND
2019-02-04	9437-001-0000	ND
2019-02-06	9437-006-0000	ND
2019-05-06	9437-010-0000	ND
2019-05-06	9437-001-0000	ND
2019-08-05	9437-010-0000	ND
2019-08-05	9437-001-0000	ND
2019-11-04	9437-010-0000	ND
2019-11-04	9437-006-0000	ND
2019-11-04	9437-001-0000	ND