Backflow Preventer service installs, replaces, and repairs approved assemblies that protect drinking water from cross-connections. Seattle Plumbers coordinates the plumbing work with the device selection, inspection, and certified testing required for the specific Seattle installation.
When Backflow Protection Is Required
When backflow protection is required depends on the actual or potential cross-connection and its hazard level. Irrigation, boilers, fire systems, chemical equipment, auxiliary water supplies, pools, pumps, and certain commercial facilities can create paths for nonpotable substances to enter drinking-water piping.
Seattle Public Utilities and the plumbing authority determine the required protection for each installation. A device should not be selected from pipe size or appearance alone.
Types of Backflow Prevention
Types of backflow prevention include approved air gaps, reduced pressure assemblies, double check valve assemblies, pressure vacuum breaker assemblies, and spill-resistant vacuum breakers. Each protects against specific hydraulic conditions and hazard levels.
Selection considers:
- The contaminant or pollutant risk
- Backpressure, backsiphonage, or both
- Premises isolation or point-of-use protection
- Indoor or outdoor location
- Freeze and physical-damage exposure
- Drainage for relief-valve discharge
- Access for testing, repair, and replacement
High-health-hazard premises can require reduced-pressure protection at the water-service connection. The authority responsible for the property confirms the exact assembly and location.
Installation and Replacement Process
Installation and replacement process planning begins with the hazard determination, approved assembly, pipe size, available pressure, and required access. We install shutoff valves, supports, drainage provisions, and the assembly in its approved orientation while preserving clearance for testing and repair.
Permits and inspections may be required when installing, relocating, or changing plumbing. The project scope is confirmed before work begins.
Inspection and Certified Testing
Inspection and certified testing verify that the assembly is installed correctly and operates as designed. In Seattle, new assemblies require inspection and testing before service. Testable assemblies must be tested by a Washington State certified Backflow Assembly Tester, including after repair or replacement and on the required annual schedule.
The tester submits the required report to Seattle Public Utilities or the responsible authority. The water-service owner remains responsible for timely compliance and records.
Backflow Preventer Repair and Maintenance
Backflow preventer repair and maintenance address failed check valves, leaking shutoffs, relief-valve discharge, worn rubber parts, freeze damage, corrosion, and failed test results. Repairs use compatible components, and the assembly is retested before it returns to service.
Schedule Backflow Preventer Service
Schedule Backflow Preventer service with Seattle Plumbers when a cross-connection needs protection or an existing assembly requires plumbing repair or replacement. We define the installation work and coordinate the testing and approval steps for your Seattle property.