Silver Lake Water and Sewer District

Cross Connection Control

Backflow Prevention Assembly Test Report Submittals

As of July 1, 2021, Silver Lake Water and Sewer District requires Backflow Prevention Assembly Test Reports to be submitted online utilizing WebTest at slwsd.tokaytest.com. Usernames and passwords are unique to each technician and testing company and are issued by the District. If you have forgotten your login credentials or need to request credentials, please click here to send an email to the District requesting your username and password.

For more information on the WebTest Portal please see the "Related Links" below.

For more information regarding cross connection please contact the District's Cross Connection Specialist at 425.659.2304.

What is a Cross Connection?

A Cross Connection is defined as any actual or potential physical connection between a public water system, or the customer's water system, and a source of non-potable liquid, solid or gas that could contaminate the public water system by backflow.

Cross Connection Control protects public health by requiring the installation of backflow prevention assemblies at all actual or potential cross connections. These assemblies must be registered with the District and tested annually by a certified backflow assembly tester (BAT).

Cross connections can exist in all plumbing systems; therefore, the District operates and maintains a Cross Connection Control Program. This program helps reduce the risk of contaminates entering the public water supply by monitoring cross connections and backflow protection.

What is Backflow?

Backflow occurs when water or other substances flow in the opposite direction than intended allowing 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.

Washington State Requires Annual Backflow Assembly Testing

In our complex water system, everything is connected. The District's cross connection and backflow prevention program required by Washington State regulations (WAC 246-290-490) is designed to keep pollutants and contaminants from entering your clean drinking water system. For example, if you have irrigation, fire sprinkler or other water using systems, you may need to have the connection between your systems and the District's checked every year. It is important to ensure your backflow assembly valves are working properly to prevent pollutants and contaminants from entering the drinking water system. The District is committed to providing our customers clean, safe, drinking water. This is where we need you to do your part.

WebTest Related Links

Cross Connection Control Resources

District Resources

Outside Resources