Backflow Base / Tester certification / Maryland
Backflow tester certification in Maryland.
No MDE tester certification program was found. WSSC Water, the largest system, allows only its registered plumbers who hold a WSSC-approved cross-connection certification to test.
Last updated .
Who certifies
Each Maryland water system or county (no state tester certificate found)
301-206-4004
There is no state tester certificate. Each water system decides which certificates it accepts.
What it takes
- Credential
- WSSC-approved cross-connection technician certification (WSSC area); other systems not confirmed
- Before you start
- WSSC: a WSSC-licensed and registered journeyman or master plumber. ABC Baltimore's course requires a Maryland apprentice, journeyman or master plumbing license.
- Training
- 32-hour initial course (WSSC-approved; ABC Baltimore's version is described as Maryland State Plumbing Board approved and ASSE instructor-led).
- Exam
- Final written exam and hands-on performance test at the end of the course.
- Renewal
- Every 3 years (WSSC and the ABC Baltimore course page).
- Fees
- ABC Baltimore lists the 32-hour course at $400 to $600.
Certificates from elsewhere
No other state's certificate is named as valid here. Ask the program before you rely on one.
Where to get certified
- Associated Builders and Contractors (ABC) Baltimore/Metro WashingtonBaltimore, MD · course and exam · in person. 32-hour backflow certification, 2101 E. Biddle St. Page opened was a past 2025 session; check current dates.
Listed for convenience, not endorsed. Check that a course is on the state's approved list before you pay.
Free exam prep → Study questions, practice exams, device tests.
Test procedures for every assembly → The steps we recommend for the field exam.
Filing test reports
No statewide reporting rule found. Reports go to the water system or county that serves the property.
Largest water systems
WSSC Water
- Contact
- 301-206-4004
- Reports
- Page does not explain where to send routine test reports; call Cross-Connection Program Support. Montgomery County 301-206-7932, Prince George's County 301-206-8601.
- Testers
- Only WSSC-licensed and registered journeyman or master plumbers who are certified cross-connection technicians may test and repair. 32-hour WSSC-approved course; recertify every 3 years. WSSC does not test and does not endorse firms.
Baltimore City Department of Public Works
Anne Arundel County (Glen Burnie-Broadneck system)
Howard County Department of Public Works
Harford County Department of Public Works
Sources
Little of this could be confirmed from an official source. Call the program or the water system before you rely on it.
Checked 2026-10-19 against each state's own program pages and rules. Rules change; confirm with the program before you book an exam or a test. Spot something out of date? hello@backflowbase.com.
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.