Backflow Base / Every state / California / San Francisco
Backflow testing software for San Francisco, California.
For testing companies working San Francisco's 827,526 people: booking, routes, the field test, and the report to the water system.
Water systems based in San Francisco
- California Water Service-S San Francisco62,609 people served
- Presidio of San Francisco3,500 people served
- San Francisco Regional Water System600 people served
- Six Acres Water Company66 people served
- Sonoma County Mutual Water Company40 people served
Plus 1 smaller system based here. Households near San Francisco 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 Francisco
84 companies on the tester lists of 1 water system. The first 25:
- #1 Backflow Testing
- #1 Castle Care Backflow Testing
- $125 Backflow Testing
- 1 Backflow Plumbing
- 24/7 Rooter & Plumbing Services
- 415 Backflow Testing
- 4th of July Backflow Testing
- A Plus Back Flow LLC
- AA Precision Backflow
- AAA Backflow Prevention Service
- AAA Backflow Testing LLC
- ABC Testing, INC
- ACCO Engineered Systems
- ACE Backflow Testing & Repair
- Ace Plumbing & Rooter
- Acme Bay Area Backflow, Inc.
- Agile Backflow Solutions
- Air Systems Service & Construction
- Alansi’s Rooter & Plumbing
- All Perspective Backflow Testing
- All Star Fire Protection
- American Water Heater Service, Inc
- Arch Plumbing Inc
- ASTI Services
- Ayoob & Peery Plumbing Co.
From San Francisco Public Utilities Commission (dated July 10, 2025). 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 San Francisco
2 published prices for a routine annual test:
- Better Cost Backflow Service$135, San Francisco. Annual test, 1 assembly; $130 each for 2+; $140 new installed; $185 DCDA-II. San Francisco County.
- 415 Backflow Testing$185, San Francisco. Per tested backflow, includes electronic filing; $135 each for additional devices; includes SFPUC tag tax from 2025.
Prices as each company publishes them, checked October 19, 2026. Repairs, extra assemblies and trip fees vary; confirm before you book.
Other California cities
- Los Angeles →3,878,704 people
- San Diego →1,404,452 people
- San Jose →997,368 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.