Silver

Downey Water Department

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
2014	ND	6	ND
2015	ND	7	ND
2016	ND	6	ND
2017	ND	7	ND
2018	ND	7	ND
2019	ND	7	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-13	2706-032-0859	ND
2014-02-13	2706-011-0838	ND
2014-02-13	2706-010-0749	ND
2014-02-13	2706-009-0804	ND
2014-02-13	2706-007-0958	ND
2014-02-13	2706-005-0934	ND
2015-02-12	2706-033-1006	ND
2015-02-12	2706-019-1259	ND
2015-02-12	2706-017-1228	ND
2015-02-12	2706-016-0836	ND
2015-02-12	2706-014-1133	ND
2015-02-12	2706-012-0736	ND
2015-03-10	2706-018-0735	ND
2016-02-23	2706-030-0758	ND
2016-02-23	2706-029-0835	ND
2016-02-23	2706-020-0954	ND
2016-02-23	2706-026-0859	ND
2016-02-23	2706-025-0725	ND
2016-02-23	2706-024-0935	ND
2017-01-10	2706-007-1050	ND
2017-01-10	2706-032-1030	ND
2017-01-10	2706-005-0856	ND
2017-01-10	2706-009-0826	ND
2017-01-10	2706-011-0959	ND
2017-02-28	0007-021-2040	ND
2017-02-28	2706-010-0742	ND
2018-02-13	9588-014-1255	ND
2018-02-13	9588-016-1132	ND
2018-02-13	9588-033-1220	ND
2018-02-14	9588-017-1136	ND
2018-02-21	9588-019-1000	ND
2018-02-21	9588-018-0925	ND
2018-03-14	9588-012-1131	ND
2019-01-24	9588-030-0822	ND
2019-01-24	9588-029-0905	ND
2019-01-24	9588-025-0730	ND
2019-01-25	9588-021-0840	ND
2019-01-25	9588-026-0806	ND
2019-01-25	9588-020-0938	ND
2019-01-31	9588-024-0820	ND