Washington Water Purveyors Backflow compliance guides for Washington water utilities
Received a backflow testing notice? The utility that sent it is called your water purveyor. Find your purveyor below to see their submission process, deadlines, and how to schedule a certified tester.
Schedule Backflow TestWhy this page exists
Backflow testing rules vary by water purveyor. Your notice will name the specific utility that manages your compliance — Seattle Public Utilities, Tacoma Water, Lakehaven, and so on. Each one has its own submission process, deadlines, and contact info. Pick yours to see the specifics.
Purveyors we've documented
Don't see your purveyor?
Washington has hundreds of water purveyors and we're actively adding pages for the largest. Schedule a test and we'll match you with a certified tester regardless of which utility you're on.