Backflow Base / Every state / Washington
Backflow testing software for Washington.
Booking, scheduling, the field test, and the report to the water system, for testing companies in Washington.
Washington water systems
Washington has 2,301 active community water systems. Each test report goes to the one that serves the address. The largest:
- Seattle Public Utilities1,161,961 people served
- City of Tacoma Water Division446,245 people served
- City of Vancouver373,047 people served
- City of Spokane346,138 people served
- City of Bellevue321,349 people served
- Alderwood Water District245,715 people served
- City of Everett Public Works Dept.215,774 people served
- Kent Water Department166,421 people served
- City of Redmond Water System163,335 people served
- Clark Public Utilities153,526 people served
Water systems: EPA SDWIS, active community systems, 2026-10-19. Population: Census Bureau 2024 estimates.
Testing companies in Washington
285 companies on the tester lists of 4 water systems, the most-listed first. The first 25:
- 1st Choice Testinglisted by 4 systems
- Backflows Northwestlisted by 4 systems
- McKinstrylisted by 3 systems
- Western States Fire Protectionlisted by 3 systems
- Access Backflow Testing & Repairlisted by 2 systems
- American Backflow Services, Inc.listed by 2 systems
- Backflow by the Bestlisted by 2 systems
- Beacon Backflowlisted by 2 systems
- C & E Lawn Sprinklerslisted by 2 systems
- Clark County Sprinkler Repairlisted by 2 systems
- COSCO Fire Protectionlisted by 2 systems
- Drake's 7 Deeslisted by 2 systems
- Frontier Landscapinglisted by 2 systems
- Johnson Controlslisted by 2 systems
- Landscape Management 2 LLClisted by 2 systems
- Silver Star Landscapelisted by 2 systems
- Vanport Mechanical & Fire Sprinkler Inc.listed by 2 systems
- 40 Dollar Backflowlisted by 1 system
- 5 Star Backflow Serviceslisted by 1 system
- A Plus Irrigation and Landscaping, LLClisted by 1 system
- A Woman's Touch LLClisted by 1 system
- A-1 Backflowslisted by 1 system
- A-Backflow Removal Companylisted by 1 system
- A-BATlisted by 1 system
- A-Rated Backflow Co.listed by 1 system
From City of Spokane, City of Vancouver, Clark Public Utilities, City of Bellevue. Checked October 19, 2026. A list shows who may test, not who is good; ask the water system for its current list.
What a test costs in Washington
Average $59 per assembly (median $57), from 4 published prices, $45 to $75.
- 40 Dollar Backflow$45. Annual backflow testing, starting at (site text).
- Certified Backflow Testing$55. Standard residential exterior assembly, starting at; interior from $65; over 2 inch from $100.
- Aquasense$60. One existing 1 inch DCV landscape sprinkler assembly outdoors; $79.95 single indoor assembly; $49.95 each for 2-10 units.
- Batgirl Backflow Testing, LLC$75. Starting at, per assembly; $150 in a vault; Seattle test $100 per assembly.
Prices as each company publishes them, checked October 19, 2026. Repairs, extra assemblies and trip fees vary; confirm before you book.
Cities
- Seattle →780,995 people
- Spokane →230,609 people
- Tacoma →228,202 people
- Vancouver →198,992 people
- Bellevue →154,377 people
- Kent →136,588 people
- Everett →113,011 people
- Spokane Valley →108,267 people
- Renton →105,543 people
- Federal Way →100,252 people
Testing in Washington
Who may test is set by the state, the water system, or both. Ask the water system you will test for which certifications it accepts before your first test.
The software
- Bookings from a booking page, your own website, and an AI receptionist on your phone.
- Schedule board and route for each tester.
- Field app that scores every test, even with no signal.
- Test reports sent to the water system that serves each address.
- Card payments to your own Stripe account, and yearly renewals that charge after the test.
- Client portal for HOAs, property managers and contractors.
- $50/month flat: no per-test fee, no cut of payments.
- Every feature →What the app does, part by part.
- Compare →Next to other backflow and field-service software.
- Start free →No card. $50/month or $500/year once you go live, 45 days free.
- Free exam prep →Study questions, practice exams, device tests, a VR wet lab.