Silver

City of Tracy

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	9	ND
2015	ND	1	ND
2016	ND	7	ND
2017	ND	9	ND
2018	ND	10	ND
2019	ND	1	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-06-16	9590-008-0831	ND
2014-06-16	9590-006-0745	ND
2014-06-16	9590-005-0732	ND
2014-06-16	9590-003-0802	ND
2014-06-17	9590-034-0733	ND
2014-06-17	9590-030-0756	ND
2014-06-17	9590-018-0817	ND
2014-09-04	9590-004-0737	ND
2014-10-01	9590-032-0746	ND
2015-08-24	9590-008-1222	ND
2016-06-29	9590-032-0820	ND
2016-06-29	9590-018-0750	ND
2016-08-04	9590-006-0725	ND
2016-08-04	9590-003-0706	ND
2016-08-04	9590-004-0651	ND
2016-09-14	9590-034-0812	ND
2016-09-22	9590-005-0825	ND
2017-03-08	9590-030-1230	ND
2017-06-28	9590-034-0742	ND
2017-06-28	9590-032-0814	ND
2017-06-28	9590-018-0714	ND
2017-06-28	9590-008-1158	ND
2017-09-14	9590-006-0824	ND
2017-09-14	9590-005-0814	ND
2017-09-14	9590-004-0738	ND
2017-09-14	9590-003-0749	ND
2018-06-06	9590-018-0657	ND
2018-06-06	9590-032-0750	ND
2018-06-07	9590-008-0849	ND
2018-06-07	9590-006-0835	ND
2018-06-07	9590-005-0826	ND
2018-06-07	9590-004-0741	ND
2018-06-07	9590-003-0753	ND
2018-06-13	9590-034-0856	ND
2018-06-21	9590-034-0747	ND
2018-07-11	9590-004-0738	ND
2019-06-04	9590-008-1025	ND