Backflow Base / Tester certification / Delaware
Backflow tester certification in Delaware.
Sussex County says the Delaware Uniform Plumbing Code requires testable assemblies to be tested at installation and at least annually by an ASSE-certified tester, with records sent to the local water supplier under its program plan. No state tester certificate was found.
Last updated .
Who certifies
The state sets a minimum; a water system may ask for more.
What it takes
- Credential
- ASSE-certified backflow tester (per Sussex County citing the Delaware plumbing code)
Certificates from elsewhere
- ASSE 5110: accepted as it is. Sussex County says testers must be ASSE certified under the Delaware plumbing code; it does not name the ASSE series number.
No other state's certificate is named as valid here. Ask the program before you rely on one.
Filing test reports
A test record for each assembly goes to the local public water supplier, by the method in that supplier's cross-connection plan.
Largest water systems
Artesian Water Company
- Contact
- 302-453-6930
City of Wilmington Water Department
- Contact
- 844-493-7660
- Reports
- Program run with HydroCorp (844-493-7660). HydroCorp sends a notice when a test is due; the page says lists of certified inspectors and testers are posted online.
- Testers
- Testing by a certified tester at installation, relocation, repair and every year.
Veolia Water Delaware
Rehoboth Pump District
Bethany Bay Pump District
Sources
- Sussex County Cross Connection Control Program
- Wilmington Cross Connection and Backflow Control Program
- Artesian Water Company
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 Spot something out of date?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.