GroundRosterCitadel EngineeringLicensed
| Name | Citadel Engineering |
| License number | 2285A, 2285C, 2285I, 2285B, 2285H |
| License type | Class A (Percolation Tester) · Class B (Standard-Designer) · Class C (Engineered-Designer) · Class H (Systems Inspector) · Class I (Construction Inspector) |
| License status | Approved |
| Based in | Ellendale, Delaware 19941 |
| Phone | (302) 422-2574 |
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
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What this license covers
- Design: licensed to size and lay out a septic system for a specific site and soil condition.
- Engineered design: licensed to design engineered systems, used where soil or site constraints rule out a standard system.
- Site testing: licensed to run percolation tests and evaluate soils to determine what kind of system a site can support.
- Construction inspection: licensed to inspect a septic system as it is built, before it is covered over.
How to verify this license
We publish the license details exactly as they appear in Delaware's official licensing records; we do not vouch for the business itself. Before hiring, look up license #2285A, 2285C, 2285I, 2285B, 2285H directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Delaware DNREC - licensed on-site wastewater treatment and disposal system licensees, last checked 2026-08-16. Verify at the official source.
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