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Water heaters & water · Spokane and North Idaho

Backflow testing & repair in Spokane Valley, WA

Yearly tests for the backflow assemblies on lawn sprinkler systems and commercial buildings, plus repairs and replacements when one fails.

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Call 24/7(509) 535-5946
Backflow prices
Test and repair
Starting prices
  • Residential testFrom $130
  • Commercial testFrom $314
  • Repair, 3/4 to 1-1/4 inchFrom $681
  • New double check, 3/4 inchFrom $1,102
Get a quote
More than one assembly? Each extra one on the same visit costs less.
From$130Residential backflow test
From$105Each extra residential assembly
From$314Commercial backflow test
1YRBetween required tests

What is included

Backflow service.

  • Residential testsLawn sprinkler assemblies tested, out in the open or down in a vault.
  • Commercial testsAssemblies at businesses tested, with a lower price for each additional one.
  • RepairsMinor and major repairs on 3/4 to 2 inch assemblies.
  • ReplacementsReduced pressure assemblies, double checks and pressure vacuum breakers.
  • Hose vacuum breakersThe small, inexpensive protection for an outside faucet.
  • A test reportThe result for each assembly, for your water system’s records.
Gold Seal Mechanical pipe truck at a building under construction
Homes, businesses and new construction

Starting prices

Backflow test prices.

Starting prices per assembly. An assembly in a vault or pit costs more to reach.

Several assemblies
Each extra one costs less
Vaults and pits
Priced as confined space
Backflow test starting prices · Gold Seal flat-rate book, 2026
ServiceWhat it coversStarting at
Residential test
Open access
 Test a residential backflow assembly.
From$130
Members from $117
Get a quote →
Extra residential assembly
Same visit
 Each additional residential assembly.
From$105
Members from $95
Get a quote →
Residential test, Airway Heights
Open access
 A residential test inside Airway Heights.
From$152
Members from $137
Get a quote →
Extra commercial assembly
Same visit
 Each additional commercial assembly.
From$165
Members from $148
Get a quote →
Residential test
Confined space
 A residential assembly in a vault or pit.
From$260
Members from $234
Get a quote →
Commercial test
Open access
 Test a commercial backflow assembly.
From$314
Members from $282
Get a quote →
Commercial test
Confined space
 A commercial assembly in a vault or pit.
From$482
Members from $434
Get a quote →

A failed assembly is repaired or replaced at the prices below, then tested again. Member prices are for Quality Service Club members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

Repairs

Backflow repairs and new assemblies.

Backflow testing & repair · Gold Seal flat-rate book, October 2026
ServiceWhat it coversStarting at
Hose vacuum breaker
Outside faucet
 Install a hose vacuum breaker.
From$170
Members from $153
Get a quote →
Minor repair
3/4 to 1-1/4 inch
 Repair a backflow assembly.
From$681
Members from $613
Get a quote →
Pressure vacuum breaker
1 inch
 Replace a 1-inch pressure vacuum breaker.
From$762
Members from $686
Get a quote →
Minor repair
1-1/2 to 2 inch
 Repair a larger backflow assembly.
From$807
Members from $726
Get a quote →
Major repair
3/4 to 1-1/4 inch
 A major repair on a backflow assembly.
From$863
Members from $777
Get a quote →
Double check assembly
3/4 inch
 Install a 3/4-inch double check valve assembly.
From$1,102
Members from $992
Get a quote →
Major repair
1-1/2 to 2 inch
 A major repair on a larger assembly.
From$1,174
Members from $1,056
Get a quote →
Double check assembly
1 inch
 Install a 1-inch double check valve assembly.
From$1,196
Members from $1,076
Get a quote →
Reduced pressure assembly
3/4 inch
 Install a 3/4-inch reduced pressure backflow preventer.
From$1,676
Members from $1,508
Get a quote →
Reduced pressure assembly
1/2 inch
 Install a 1/2-inch reduced pressure backflow preventer.
From$1,850
Members from $1,665
Get a quote →
Reduced pressure assembly
1 inch
 Install a 1-inch reduced pressure backflow preventer.
From$2,240
Members from $2,016
Get a quote →

Member prices are for Quality Service Club members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

Know the signs

When you need us.

Most calls start with a notice from the water system.

The yearly notice

Your water system asks for a test of each testable assembly every year.

A failed test

Worn checks, springs or seals. Most assemblies can be repaired.

Water dripping from the assembly

A reduced pressure assembly that discharges water needs a look inside.

New irrigation or equipment

A new sprinkler system or a commercial connection needs an approved assembly.

How it works

Test. Report. Repair.

Book before your water system’s deadline.

  1. 01

    Test

    Each assembly is tested on site.

  2. 02

    Report

    You get the result for your water system.

  3. 03

    Repair

    A failed assembly is repaired or replaced, then tested again.

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Questions

Backflow testing & repair, answered.

Answers from licensed plumbers. Still unsure? Call (509) 535-5946, 24 hours a day.

How much does a backflow test cost?
A residential backflow test starts from $130 at Gold Seal, and each extra assembly on the same visit from $105. Commercial tests start from $314. Assemblies in a vault or pit cost more to reach.
How often does a backflow assembly need testing?
Every year. Water systems require each testable assembly, like the one on most lawn sprinkler systems, to be tested yearly, and usually send a notice when the test is due.
What is a backflow preventer?
A valve assembly that keeps water from flowing backward into the drinking water supply, so water from a sprinkler system or a business can’t get into the public lines.
What happens if my assembly fails?
It gets repaired or replaced, then tested again. Minor repairs on 3/4 to 1-1/4 inch assemblies start from $681. A new 3/4-inch double check assembly starts from $1,102.
Which assembly do I need?
It depends on the hazard and on your water system’s rules. Lawn sprinklers commonly use a pressure vacuum breaker or a double check, and higher hazards need a reduced pressure assembly. Your water system has the final say, and we install what it requires.

Membership

What members get.

Priority scheduling for emergencies, 10% off services and materials, no minor diagnostic fee, a yearly plumbing and drain safety inspection and shut-off tags on your main water valve and water heater.

Members vs non-members →

Quality Service Club

Members save
For every home and business we serve
$149first year

Plus tax. Then $95 a year when you renew.

  • Priority scheduling for emergencies
  • 10% off services and materials
  • No minor diagnostic fee
  • A yearly plumbing and drain safety inspection
  • Shut-off tags on your main water valve and water heater
Join the Quality Service Club Everything it includes →

Related services

The same company handles every pipe on the property, from the water meter to the sewer main.

From $400Pressure regulators & booster pumpsPressure that’s too high or too lowPrices and details → From $273Water softeners & filtersSofteners, filters and reverse osmosisPrices and details → Bid on plansCommercial constructionGround-up, tenant improvements, prevailing wagePrices and details → From $152Leak detectionFound by testing, not by tearing out wallsPrices and details →

Test notice in the mail? Get it done before the deadline.

Backflow testing and repair across Spokane and North Idaho.

Call 24/7 (509) 535-5946
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