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About Your Service

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Our Service Area

Other Neighboring Sewer and Water Utility Providers

Our Source of Water

Silver Lake Water & Sewer District's water comes from a large freshwater lake known as Spada Reservoir, located about 30 miles east of Everett, Washington—the primary source of high quality drinking water for the majority of Snohomish County.


Spada Reservoir is part of the Upper Sultan River Watershed, an 80 square mile area that is one of the wettest watersheds in the continental United States, with an average annual rainfall of approximately 165 inches.

Water from Spada Reservoir is treated at the City of Everett Water Filtration Plant before being transport by pipeline to the City of Everett and distributed to several agencies including the District.

Silver Lake Water & Sewer District purchases our treated water from the City of Everett,  Alderwood Water & Wastewater District and Clearview Water Supply Agency; the majority comes from Clearview Water Supply Agency—an interlocal group formed by Alderwood, Silver Lake and Cross Valley that offers the same water at the lowest cost.

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Water System
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Our Water System

Silver Lake Water & Sewer District was originally formed as a municipal corporation in 1934 to provide water service to an unincorporated area of Snohomish County.

Now almost 90 years later, we provide this service to over 18,773 homes and businesses, encompassing over 56,000 individuals.


As of 2022, our customer base consumed an average of 4.1 million gallons of water per day and 1.5 billion gallons per year.

Water System Components

  • 3 Reservoirs:  Reservoir No. 2 holds 4 million gallons (MG), Reservoir No. 3 holds  4.2 MG, and Reservoir No. 4 holds 8 MG—for a total water storage capacity of 16.4 MG.

  • 10 Master Meters interconnected for back up water supply from the City of Everett, Cross Valley Water District, Clearview Water Supply Agency, and Alderwood Water & Wastewater District

  • 3 Pump Stations, all collocated with reservoirs

  • 16 Pressure Reducing Stations and Valves separating three distinct pressure zones

  • 207.11 Miles of water main (piping)

  • 36 Intertie or isolation valves

  • 1,799  Fire Hydrants supporting 3 Fire Districts

  • 18,773 Metered Connections/Customers 

Water Quality

Our Water Quality

Water quality begins at the source: the Sultan Basin is carefully monitored, the watershed is patrolled, and human activities are limited to minimize the impact on the naturally pristine water.

From the lake, water travels to the City of Everett's water treatment plant, where it undergoes coagulation, flocculation, filtration and disinfection, before being distributed to the Clearview Water Supply Agency, of which Silver Lake Water & Sewer District is one of three members.

While Silver Lake Water & Sewer District still purchases some of our water from the City of Everett, the majority is supplied by Clearview.

Annual Water Quality Reports

2023  |  2022  |  2021  |  2020 

2019  |  2018  |  2017  |  2016

Additional Links about Water Quality

PFAS Monitoring

Silver Lake Water & Sewer District’s drinking water remains safe and protected from the group of manmade chemicals labeled per- and polyfluoroalkyl (PFAS) substances.

Learn more and view test results here >

Enjoying Clean Water
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Our Sewer System

The District's service area is split into two separate sewer basins. Services in the Everett basin flow to the City of Everett for treatment and disposal. Services in the Alderwood basin flow to the King County Department of Natural Resources (Metro) for treatment and disposal, by way of Alderwood Water and Wastewater District.

The original basic sanitary sewer collection system was constructed in 1970 and 1971 by Fircrest Sewer District. In 1980, Silver Lake Water District merged with Fircrest Sewer District, later becoming the current Silver Lake Water & Sewer District servicing 17,545 customers in 2022.

Sewer System Components

  • 22 Lift Stations (including the private Glacier Peak Station and the soon-to-be-online Brasswood Station)

  • 173.25 Miles of Pipe

  • 5,225 Manholes

  • 49 Lamp Holes (smaller clean out access)

  • 17,545 Connections/Customers

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