Backflow Base / Every state / California / San Diego
Backflow testing software for San Diego, California.
For testing companies working San Diego's 1,404,452 people: booking, routes, the field test, and the report to the water system.
Water systems based in San Diego
- City of San Diego,1,408,937 people served
- Naval Medical Center San Diego2,981 people served
- Nas North Island & Nab Coronado421 people served
- Butterfield Ranch350 people served
- Northcrest Mobile Home Park250 people served
Plus 3 smaller systems based here. Households near San Diego may be served by another system; Backflow Base matches each address to its own. All 2,783 in California →
Water systems: EPA SDWIS, active community systems, 2026-10-19. Population: Census Bureau 2024 estimates.
Testing companies in San Diego
194 companies on the tester lists of 1 water system. The first 25:
- $45 County Backflow
- $49 Pass 2 Pay Backflow
- 1 Affordable Backflow
- 123 Backflow Testing
- 1st Choice Backflow
- 1st Choice R&R Backflow Testing and Serv
- 24Hr Express Services
- 9-Dam Backflow Testing
- A Awesome Backflow Service
- A to Z Plumbing
- A&S Backflow
- A+ Backflow Testing
- Aa Farnsworth's Backflow Services
- AAA Backflow USA
- Aaa Goforth Plumbing
- Ability Plumbing
- ABP Backflow
- Academy Backflow Service
- ACCO Engineered Systems
- Advanced Backflow Service
- Ahlee Backflow Service
- Alexis Janssen Backflow
- All Aces Backflow
- All Align LLC
- All American Backflow Services
From City of San Diego (dated August 26, 2026). Checked October 19, 2026. A list shows who may test, not who is good; ask the water system for its current list.
Other California cities
- Los Angeles →3,878,704 people
- San Jose →997,368 people
- San Francisco →827,526 people
- Fresno →550,105 people
- Sacramento →535,798 people
- Long Beach →450,901 people
- Oakland →443,554 people
- Bakersfield →417,468 people
- Anaheim →344,561 people
- Stockton →324,975 people
- Riverside →323,757 people
- Irvine →318,683 people
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.