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PFAS Monitoring Silver Lake Water & Sewer District’s drinking water remains safe and protected from contaminants, including the group of manmade chemicals labeled per- and polyfluoroalkyl (PFAS) substances. The District sources its water from the City of Everett. Due to the protected nature of their watershed, which prohibits activities like firefighting training, manufacturing, and agriculture, there are no point sources of PFAS within our source water. What are Perfluoroalkyl substances (PFAS)? PFAS are a group of chemicals that are used widely and are commonly found in things like firefighting foam agents, the manufacture of non-stick materials for cooking (such as Teflon), and fabric protectants. ​ Learn More: Environmental Protection Agency Washington State Dep't. of Health Background and History of PFAS Monitoring In 2016, The Environmental Protection Agency (EPA) released a health advisory for drinking water pertaining to two of the compounds found in the PFAS group: Perfluorooctanoic acid (PFOA) and Perflourooctanesulfonic acid (PFOS). Health advisory levels are non-enforceable guidelines that are intended to protect human health. The health advisory level is 0.07 parts per billion (ppb) for PFOA and PFOS combined. ​ The Washington State Board of Health (WSBOH) recently revised the Group A drinking water rules to require water systems to monitor for select PFAS compounds beginning in 2023. WSBOH established state action levels (SALs) for five selected PFAS compounds as follows: Perfluorooctanoic acid (PFOA) - 0.010 ppb Perfluorooctane sulfonic acid (PFOS) - 0.015 ppb Perfluorononanoic acid (PFNA) - 0.009 ppb Perfluorohexane sulfonic acid (PFHxS) - 0.065 ppb Perfluorobutane sulfonic acid (PFBS) - 0.345 ppb Exceeding a confirmed SAL requires a water system to provide public notification and follow-up monitoring. While exceeding a SAL does not require a water system to treat for the contaminant, the SALs are intended to advise water systems on when to take action to lower contaminant levels to provide for safe, long-term consumption of drinking water. Testing Your Drinking Water for PFAS In 2015, Silver Lake Water & Sewer District participated in monitoring for PFAS in its drinking water under the Unregulated Contaminant Monitoring Rule 3 (UCMR 3). No PFAS compounds were detected in the Districts drinking water as shown in Table 1 below: ​ Table 1: In 2023 through May 2024, the District monitored our drinking water quarterly for an expanded list of PFAS compounds under the EPA’s current Unregulated Contaminant Monitoring Rule (UCMR 5 ) . Once again, no PFAS compounds were detected in the District's drinking water as shown in Table 2 below: ​ Table 2:

About Your Service Service Area Water Source Water System Water Quality Sewer System Our Service Area Click here to view the District's service area boundaries in Google Maps . Other Neighboring Sewer and Water Utility Providers Snohomish County PUD 425-783-1000 City of Everett 425-257-8999 Alderwood Water & Wastewater District 425-743-4605 Cross Valley Water District 360-668-6766 Mukilteo Water District 425-355-3355 Woodinville Water and Sewer 425-487-4100 City of Snohomish 360-568-3115 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. Water System 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 Our Water System Plan 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 City of Everett Water Quality Office (425) 257-8800 State Department of Health 1-(800)-521-0323 U.S. Environmental Protection Agency 1-(800)-426-4791 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 > 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 Our Sewer System Plan

Permitting Overview of the Permitting Process For a New Water Meter Submit a residential or commercial service connection application and pay the applicable District fees when invoiced. Additional costs, permitting, and/or contractor work may be required based on size, condition, and location of the existing service line between the water main in the street and the meter box. ​ If there is no existing water main / pipe, you will be required to apply for a Developer Extension Agreement. More information is available on the Developer Process page. For a New Sewer Connection The customer is responsible for the cost of hiring a contractor to install sewer lines and restore the area. This work may entail different components depending on the type of sewer infrastructure installed near the property. If unknown, contact Engineering for more information.​ If there is an existing sewer lateral/stub to the property line: The custom er must submit a residential or commercial service connection application , pay the applicable District fees when invoiced, and hire a contrac tor to install a side sewer that meets District standards. Upon completion, the District will inspect and approve the work. ​ ​ If there is no sewer lateral/stub, or no sewer main in front of the property: The customer must apply for a Developer Extension Agreement, and hire a contractor to install a lateral and /or new sewer main. More information is available on the Developer Process page. Water / Sewer Availability A letter of water and/or sewer availability is required for most building permits in the City of Mill Creek or Snohomish County. It is also the typical first step in the land development process. Please note on the application if the work involves an Accessory Dwelling Unit (ADU) or an adult family home. Please include any building or site plans that show the proposed work. Application for Water & Sewer Availability Response. Service Connection Applications For a new water meter, and/or new sewer connection to an existing stub on a residential property, use the Application for New or Modified Residential Water and/or Sewer Service form. ​ For a commercial service connection or irrigation service, use the Application for new or Modified Irrigation, Multi-Family / Commercial Water and/or Sewer Service form. Request As-Builts from the District Engineer Contact District Engineer

If you have a water or sewer emergency, call us at (425) 337-3647 Welcome to Silver Lake Water & Sewer District Serving more than 56,000 residents in Mill Creek and unincorporated Snohomish County since 1934 Attend a Public Meeting Pay Online Now About Your Bill Forms & Documents Contact The District News & Announcements Upcoming Board of Commissioners Meeting Next Meeting: Thursday, May 23rd Starting at 5:30 pm Learn More We're Hiring! Finance Manager; Utility Maintenance Worker/Apprenticeship Program; Seasonal Maintenance Worker Learn More News Archive Our Mission Silver Lake Water & Sewer District's mission is to provide high quality, safe and reliable water and wastewater services, while practicing good stewardship of both natural and financial resources. As our service area grows, we are continually making investments in our infrastructure to ensure an adequate supply of water is readily available to meet the needs of all customers. About Your Service About Us

Newsletter Archive Spring/Summer 2024 ​Fall/Winter 2023 Spring/Summer 2023 ​Fall/Winter 2022 Spring/Summer 2022 ​Fall/Winter 2021 Spring/Summer 2021 ​Fall/Winter 2020 Spring/Summer 2020 ​Fall/Winter 2019 Spring/Summer 2019 Fall/Winter 2018

News & Events Board of Commissioners Meetings Held on the 2nd and 4th Thursdays each month Silver Lake Water & Sewer District welcomes the public to attend and comment at our Board of Commissioners meetings, held on the second and fourth Thursdays of each month at 5:30 p.m. Currently, these meetings are being held in a hybrid format (in-person and virtually). If you would like to attend in person, please contact us at (425) 337-3647 for more information. If you would like to attend by phone, please use the conference information below: Telephone Number: 206-412-5430 Conference ID: 838 103 201# ​ Next Scheduled Meeting: Thursday, May 23rd View Agenda View Archived Minutes Notice of Public Hearing to Discuss Rate Change Thursday, April 25th Starting at 5:30 pm NOTICE IS HEREBY GIVEN that the Board of Commissioners of the Silver Lake Water and Sewer District will hold a Public Hearing at 5:30 p.m., or as soon thereafter as can be heard on Thursday, April 25, 2024, for the purpose of accepting public testimony of the proposed adjustments to the rates for water and sewer service. There is an opportunity for in-person participation; however, the public is encouraged to attend and provide comment via teleconference. The public is invited to attend the Public Hearing and address the Board of Commissioners regarding the proposed adjustment either in-person or by teleconference. The meeting will be held at the District Headquarters, at 15205-41st Avenue SE, Bothell, WA 98012. At the close of the Public Hearing, the Board of Commissioners will consider adopting a Resolution to increase rates for water and sewer service. Telephone Number: 206-412-5430 Conference ID: 838 103 201# Notice Read Our Newsletter The District publishes two newsletters a year: Spring/Summer, and Fall/Winter. View Our Newsletters News Archive Is your garden hose making your household water funky? During the summer, the most common cause of water taste or odor complaints we receive is a pressurized garden hose that has backflowed into the home’s plumbing system. ​ Here are some tips to help you with this issue: Disconnect the hose and run cold water from your faucet for a few minutes to flush the pipes. Need a sip of water on a hot day? Get it from your internal sources (sink or refrigerator) instead of a garden-variety garden hose which aren’t manufactured for delivering potable (drinking) water. ​ If the taste or odor is still present after detaching the garden hose from external spigots and flushing your pipes, give us a call at 425-337-3647. Solar Power Coming to District Headquarters Department of Commerce grant funding successful In 2022, District staff applied for the Washington State Department of Commerce Solar Retrofit Grant and were successful in acquiring $75,000 in funding to put towards installing 100 kW of solar power at the District Headquarters. In total, the state grant awarded $1.4 million to 14 different projects, adding over 1 MW of power generation to public buildings. There have been significant changes to the project since the conception, including the possibility of receiving an additional rebate of the project cost via new Federal Government legislation. ​ According to preliminary proposals, the estimated project cost will be $325,930, including $30,000 of contingency funding and $75,000 awarded by the Commerce Grant. The federal rebate may amount to an additional 40% reduction in the District’s costs. The District expects installation work to start in possibly March or April of this year, with construction taking less than a month. When complete, a 100 kW AC solar roof array will offset approximately 1/3 of our Headquarters building's electricity consumption. More information about the awardees and program can be found here.

Employment Opportunities Work for Silver Lake Water & Sewer District The Silver Lake Water & Sewer District is an Equal Opportunity Employer and does not unlawfully discriminate on the basis of race and color, religion and creed, national origin, sex, marital status, HIV, AIDS, and hepatitis C status, honorably discharged veteran or military status, age, disability, pregnancy and maternity, sexual orientation and gender identity, use of a guide dog or other service animal, genetic information or any other protected class status. Applicants with disabilities may be entitled to reasonable accommodation in the hiring process. Please contact SLWSD at (425) 337-3647 if you need assistance completing this application or to otherwise participate in the hiring process. ​ Silver Lake Water & Sewer District only accepts applications for positions that are currently open, we do not accept unsolicited applications, and are unable to retain applications for future job opportunities. For positions that are advertised as open until filled, you may still submit an application after the posted "first review date" has passed. Current Job Opportunities Finance Manager Job Description Job Brochure Utility Maintenance Worker/Apprenticeship Program Job Description Job Brochure Seasonal Maintenance Worker Job Description Job Brochure Application Form

Contact Us Location & Phone Silver Lake Water & Sewer District 15205 41st Avenue SE Bothell, WA 98012 (see map below ) (425) 337-3647 Hours Monday, Tuesday, Thursday, and Friday 8:00 AM - 4:30 PM ​ Wednesday 9:00 AM - 4:30 PM Closed Saturday, Sunday, and major holidays In Case of Emergency If you have a water or sewer emergency after hours, call our regular number, then press “1” to hold for an Emergency Operator. (425) 337-3647 Press 1 District staff are on call 24 hours a day, 7 days a week to assist you with water and sewer emergencies. Submit We've received your message and will respond to you shortly! Map

Resources Can't find the information you're seeking? Give us a call at (425) 337-3647 FAQs DIY Repair Tips Meeting Minutes Customer Assistance Programs Water Conservation Tips Annual Water Quality Reports Forms Backflow and Cross Connection Control Newsletters District Codes District Standards District Resolutions Comprehensive Water Plan Comprehensive Sewer Plan Interlocal Agreements Public Records

Cross Connection Control Help Us Keep Your Water Safe with Cross Connection Control Keeping water safe is a two-way street. We rely on you, our customers, to be aware of any cross connection to the water system that you might have on your property, and to protect those connections with a Backflow Prevention Device to ensure the safety of our drinking water. What is a Cross Connection? A cross connection is a point in a plumbing system where it is possible for a non-potable substance to come into contact with the potable drinking water supply. For homeowners, these commonly include irrigation systems, private fire sprinkler systems, boiler systems, and pool or pond equipment. What is Backflow? ​ Backflow occurs when water or other substances flow in the opposite direction than intended—such as the water in an irrigation system flowing back towards the water source once it's turned off—which allows contaminants to enter the public water system or consumer's plumbing. A backflow incident occurs when biological, chemical, or physical contaminants enter the drinking water supply (under backflow conditions) via unprotected cross-connections. Backflow incidents may cause injury, illness, or death. What is Required to Keep Water Safe? ​ In our complex water system, everything is connected. Washington State Administrative Code (WAC 246-290-490 ) requires customers to install, maintain, and test Backflow Prevention assemblies (examples shown above) to keep pollutants and contaminants from entering the clean drinking water system and prevent backflow incidents. This same Code requires Silver Lake Water & Sewer District maintain a backflow prevention program, in which we send out annual reminder letters to customers with Backflow Prevention Devices when their device's annual test is due. What Are Your Responsibilities? If you have irrigation, fire sprinkler or other water-using systems, you will need to: Have a Backflow Prevention Device installed at the connection between your systems and the District's public water system; Have a state certified Backflow Assembly Test performed annually (see a link to a list of certified testers below); and The tester is required to send in your test report using our online portal: Tokay WebTest Portal . WebTest Portal WebTest Training Guide WebTest Training Video Additional District Resources Certified Backflow Assembly Tester List District Code regarding Cross Connection Control Brochure for Residential Irrigation Backflow Prevention Click Here to Schedule an Annual Water Truck Inspection Outside Resources American Backflow Prevention Association Western Washington Cross Connection Prevention Professionals Group City of Everett Public Works Brochures If you are an existing backflow customer, be sure your information is up to date for receiving reminders, and get your annual test scheduled in advance. If you have questions about your due date, or need a list of registered testers, or have any questions at all, please contact us: backflowtests@slwsd.com (425) 659-2304

Current Projects 10th Drive SE Water and Sewer Improvements Scope – the District will be replacing 5,000 feet of old cast iron water main on 10th Drive SE with an upsized ductile main, and installing 2,400 feet of new sewer main along portions of the route where it is cost effective to do so ​ Total estimated project cost – $6 million, partially funded by a $2 million low interest loan from the State Public Works Assistance Account ​ Construction schedule – Work will begin in early 2024 and will take approximately nine months to complete ​ More information at www.10thDriveWaterandSewer.com Lift Station Improvements A lift station is a pumping facility that moves wastewater from lower elevations to higher elevations. Incorporating lift stations at certain points in a gravity pipeline system is integral to moving sewage to a wastewater treatment plant efficiently and cost-effectively. Silver Lake currently has has 21 sewer lift stations in our wastewater system, several of which are 20 – 30 years old, and coming to the end of their service life with similar maintenance issues. In response, the District is planning to rehabilitate several of these existing lift stations over the next two to three years, and bring another three new lift stations online soon. Below is a summary of each lift station project’s scope, cost, and timeline. If you have questions about these or any of our other projects, give us a call at (425) 337-3647. Lift Station No. 4 Improvements Scope – Replace the original generator for backup power, along with electrical controls and new canopy for weather protection. ​ Total estimated project cost – $600,000 ​ Construction schedule – Spring 2023 pending generator delivery Pioneer Trails Lift Station Replacement Scope – Replace an existing station with three submersible pumps, increased capacity, a new backup generator, and electrical control building. The existing 35-foot deep wet well will be converted to overflow storage. ​ Total estimated project cost – $4.1 million ​ Construction schedule – Begin 2023, completion in 2024 Larimer 1 Lift Station Replacement Scope – Replace an existing station with submersible pumps, a new backup generator, and electrical control building. The existing wet well will be converted to overflow storage. ​ Total estimated project cost – $2.8 million ​ Construction schedule – 2024 to 2025 Highlands East Lift Station Rehabilitation Scope – Rehabilitate an existing lift station to accommodate increased flow from new upstream developments. Scope is still TBD but may include replacement of motors and pumps, rehabilitating the wet well, new electrical controls, and site improvements. ​ Total estimated project cost – $1.5 million ​ Construction schedule – 2024 to 2025

New Development District Codes District Standards District Forms Overview of the Process for Builders and Developers Developer Extension Phases, Submittals, and Fees Request As-Builts from the District Engineer Contact District Engineer Projects Out for Bid The District currently has no projects out for bid Invitation for Bid: Reservoir No. 4 Roof Recoating Bids due by 10:00 am on Wednesday April 10th, 2024 The work to be performed for this project consists of surface preparation and re-coating of the roof and appurtenances of the District’s Reservoir No. 4, as well as pressure washing the side shell of the reservoir. The project site street address is 2210 132nd St SE, Mill Creek, WA 98012. ​ Bid opening date has been changed to April 10th, 2024. ​ Invitation to Bid, General Specifications, and Bid Form Addendum No. 1 Addendum No. 2 View Current Projects