Backflow Base / Every state / Maryland
Backflow testing software for Maryland.
Booking, scheduling, the field test, and the report to the water system, for testing companies in Maryland.
Maryland water systems
Maryland has 425 active community water systems. Each test report goes to the one that serves the address. The largest:
- Washington Suburban Sanitary Commission1,900,000 people served
- City of Baltimore1,600,000 people served
- Glen Burnie-Broadneck290,606 people served
- Howard County D.P.W. Distribution286,158 people served
- Harford County D.P.W.104,567 people served
- City of Hagerstown92,200 people served
- Waldorf - Charles County Dpw84,296 people served
- New Design - Frederick County74,911 people served
- Crofton-Odenton62,986 people served
- Fort George G. Meade62,234 people served
Water systems: EPA SDWIS, active community systems, 2026-10-19. Population: Census Bureau 2024 estimates.
Testing companies in Maryland
101 companies on the tester lists of 1 water system. The first 25:
- A & B Luck Plumbing & Heating, Inc.
- AA Rooter, LLC
- Acker & Sons
- Acme Plumbing, LLC
- All Around Plumbing, Inc.
- All Season Plumbing, Heating & A/C
- Alpha 1 Plumbing, Inc.
- Alpha Plumbing LTD, Inc.
- AM Bell Plumbing
- American Combustion Industries, Inc.
- American Masters Plumbing Co., LLC
- Apperson Plumbing, Inc.
- Aquaflow Plumbing & Heating Services, Inc.
- Arthur M. Black, Inc.
- Aspen Hill Plumbing
- Associates Plumbing
- B-Tek, LLC
- B. McCall Plumbing & Heating
- B’s Plumbing
- Backflow Technology, LLC
- Benjamin F. Gartrell & Sons Plumbing & Heating
- Bonds & Bonds Plumbing, LLC
- Borchers Mechanical Services, Inc.
- Burco Plumbing Corp.
- Capitol Boiler Works
From WSSC Water (dated October 14, 2026). Checked October 19, 2026. A list shows who may test, not who is good; ask the water system for its current list.
Cities
- Baltimore →568,271 people
- Frederick →89,537 people
Testing in Maryland
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.