Backflow hazard prevention

Your garden hose, kitchen sink sprayer and sprinkler systems are ways chemicals or bacteria could enter your drinking water in your home. View or download Backflow hazard prevention (PDF) and Is your hose a health hazard? (PDF) to learn more.

View or download documents related to backflow prevention:

• 2023 backflow assembly tester list (PDF)
• Backflow assembly (BFA) models (PDF)
• Blank backflow assembly test report (PDF)
• COE fire hydrant & standpipe use policy 11-28-2018 (PDF)
• Washington State DOH backflow prevention assembly list 10-24-2018 (PDF)

Contact Tim Markham, Water Quality Operator, email or 425-257-8833 if you have questions about cross connection or water backflow prevention.