Backflow Base / Every state / California / Ontario
Backflow testing software for Ontario, California.
For testing companies working Ontario's 185,285 people: booking, routes, the field test, and the report to the water system.
Water systems based in Ontario
- Ontario Municipal Utilities Company185,010 people served
- Chino Basin Desalter Auth. - Desalter 20 people served
- Chino Basin Desalter Auth. - Desalter 10 people served
Households near Ontario 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.
Other California cities
- Los Angeles →3,878,704 people
- San Diego →1,404,452 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
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.