Silver

Westford 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	Detections	Range of results
2014	ND	13	0	ND
2015	ND	13	0	ND
2016	ND	11	0	ND
2017	ND	10	0	ND
2018	0.250 ppb	12	2	ND - 2.00 ppb
2019	ND	10	0	ND

ppb = parts per billion

All test results

Date	Result
2014-06-04	ND
2014-06-04	ND
2014-06-04	ND
2014-06-04	ND
2014-06-04	ND
2014-06-04	ND
2014-06-09	ND
2014-06-11	ND
2014-06-11	ND
2014-06-11	ND
2014-06-11	ND
2014-06-25	ND
2014-06-30	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2015-05-04	ND
2016-04-05	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2017-06-01	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	2.00 ppb
2018-05-15	ND
2018-05-15	1.000 ppb
2018-05-15	ND
2018-05-16	ND
2018-05-16	ND
2018-05-16	ND
2018-05-16	ND
2018-05-16	ND
2019-05-01	ND
2019-05-01	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND