Silver

City of Norfolk

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	8	ND
2015	ND	8	ND
2016	ND	8	ND
2017	ND	8	ND
2018	ND	8	ND
2019	ND	8	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-11	14026242-MET	ND
2014-02-11	14026243-MET	ND
2014-05-13	14050227-MET	ND
2014-05-13	14050226-MET	ND
2014-08-12	14083424-MET	ND
2014-08-12	14083425-MET	ND
2014-11-12	14116687-MET	ND
2014-11-12	14116688-MET	ND
2015-02-10	00225-CITY OF NO	ND
2015-02-10	00225-CITY OF NO	ND
2015-05-12	00225-CITY OF NO	ND
2015-05-12	00225-CITY OF NO	ND
2015-08-11	00225-CITY OF NO	ND
2015-08-11	00225-CITY OF NO	ND
2015-11-09	00225-CITY OF NO	ND
2015-11-09	00225-CITY OF NO	ND
2016-02-09	16022727-MET	ND
2016-02-09	16022731-MET	ND
2016-05-10	16055886-MET	ND
2016-05-10	16055887-MET	ND
2016-08-09	16089082-MET	ND
2016-08-09	16089083-MET	ND
2016-11-08	16112157-MET	ND
2016-11-08	16112159-MET	ND
2017-02-14	17025479-MET	ND
2017-02-14	17025480-MET	ND
2017-05-09	17058219-MET	ND
2017-05-09	17058221-MET	ND
2017-08-08	17081354-MET	ND
2017-08-08	17081356-MET	ND
2017-11-14	17114482-MET	ND
2017-11-14	17114487-MET	ND
2018-02-13	18027240-MET	ND
2018-02-13	18027216-MET	ND
2018-05-08	18059822-MET	ND
2018-05-08	18059848-MET	ND
2018-08-14	18083057-MET	ND
2018-08-14	18083080-MET	ND
2018-11-13	18115917-MET	ND
2018-11-13	18115939-MET	ND
2019-02-12	19028665-MET	ND
2019-02-12	19028693-MET	ND
2019-05-14	19052479-MET	ND
2019-05-14	19052502-MET	ND
2019-08-13	19085324-MET	ND
2019-08-13	19085353-MET	ND
2019-11-12	19118087-MET	ND
2019-11-12	19118057-MET	ND