Silver

Calico Rock

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	2	ND
2015	ND	4	ND
2016	ND	10	ND
2017	ND	14	ND
2018	ND	10	ND
2019	ND	10	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-08-25	Y142390011	ND
2014-08-25	Y142390010	ND
2015-08-19	Y152320001	ND
2015-08-19	Y152320004	ND
2015-08-19	Y152320002	ND
2015-08-19	Y152320003	ND
2016-04-12	Y161060006	ND
2016-07-12	Y161970004	ND
2016-07-12	Y161970005	ND
2016-07-12	Y161970006	ND
2016-08-30	Y162450007	ND
2016-09-26	Y162730003	ND
2016-10-11	Y162880011	ND
2016-10-11	Y162880009	ND
2016-10-11	Y162870014	ND
2016-12-13	Y163510003	ND
2017-01-10	Y170130010	ND
2017-01-10	Y170130011	ND
2017-01-10	Y170130017	ND
2017-04-11	Y171030020	ND
2017-04-11	Y171030023	ND
2017-04-11	Y171030029	ND
2017-07-11	Y171950130	ND
2017-07-11	Y171950137	ND
2017-07-11	Y171950139	ND
2017-08-15	Y172290006	ND
2017-08-15	Y172290007	ND
2017-10-10	Y172850031	ND
2017-10-10	Y172850035	ND
2017-10-10	Y172850036	ND
2018-01-30	Y180330009	ND
2018-01-30	Y180330005	ND
2018-04-11	Y181020026	ND
2018-09-12	Y182560027	ND
2018-09-12	Y182560026	ND
2018-09-12	Y182560028	ND
2018-09-12	Y182560025	ND
2018-10-09	Y182840047	ND
2018-10-09	Y182840046	ND
2018-11-19	Y183250008	ND
2019-01-15	Y190180012	ND
2019-01-15	Y190180011	ND
2019-04-09	Y191010041	ND
2019-04-09	Y191010046	ND
2019-08-26	Y192410001	ND
2019-08-26	Y192410002	ND
2019-08-26	Y192410026	ND
2019-10-08	Y192840018	ND
2019-10-08	Y192840024	ND
2019-10-08	Y192840019	ND