Silver

California Water Service (CWS) - Los Altos Suburban

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	3	ND
2015	ND	12	ND
2016	ND	5	ND
2017	ND	3	ND
2018	ND	11	ND
2019	ND	5	ND

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-09-09	5810-011-1250	ND
2014-09-10	5810-016-1125	ND
2014-09-10	5810-010-1019	ND
2015-02-03	5810-021-1002	ND
2015-02-03	5810-013-1115	ND
2015-02-03	5810-015-0916	ND
2015-03-05	5810-022-1100	ND
2015-04-09	5810-008-1100	ND
2015-04-09	5810-020-1201	ND
2015-05-13	5810-018-1347	ND
2015-08-04	5810-035-0915	ND
2015-08-04	5810-023-0948	ND
2015-09-15	5810-032-1220	ND
2015-09-15	5810-057-1240	ND
2015-10-06	5810-002-1300	ND
2016-03-23	5810-028-1120	ND
2016-03-23	5810-030-1140	ND
2016-06-15	5810-024-1245	ND
2016-08-09	5810-037-1310	ND
2016-09-07	5810-029-1322	ND
2017-01-11	5810-010-1245	ND
2017-01-11	5810-011-1300	ND
2017-10-11	5810-016-1215	ND
2018-02-12	5810-021-1415	ND
2018-02-12	5810-013-1230	ND
2018-05-08	5810-018-1335	ND
2018-05-16	5810-023-1020	ND
2018-07-10	5810-008-1305	ND
2018-08-08	5810-022-1335	ND
2018-09-18	5810-032-1320	ND
2018-09-18	5810-035-1347	ND
2018-09-18	5810-057-1225	ND
2018-10-10	5810-002-1431	ND
2018-12-26	5810-020-1420	ND
2019-03-19	5810-030-1343	ND
2019-03-19	5810-028-1357	ND
2019-06-18	5810-024-1336	ND
2019-08-20	5810-037-1125	ND
2019-09-11	5810-029-1418	ND