Washington requires the backflow assembly on a sprinkler system connected to public water to be tested at least once every 12 months by a state-certified Backflow Assembly Tester. In the Spokane area a residential test typically runs $60 to $120 per assembly as of 2026.
What it costs
| Residential backflow test | $60 to $120 per assembly |
| Rebuild kit (discs, springs, seals) | $150 to $300 installed |
| Full assembly replacement (PVB or DCVA) | $250 to $600, more for an RPBA |
Typical ranges as of 2026 from our own guides. Your technician gives you a good estimate; the final cost depends on what the job turns up. All prices.
Why it fails in Spokane
A pressure vacuum breaker sits above ground, full of water, all year. If it isn't drained during the fall blowout, the first hard freeze can split the brass. That shows up every spring.
Certified testers are stretched thin in the busy season, so don't wait until the notice says final.
How it works
- Send us the notice. Or call and we'll check what's on file.
- We test the assembly. Each check and relief valve measured with a calibrated gauge.
- Report filed. Sent to your purveyor; failures repaired the same visit.