GroundRosterDuffield AssociatesLicensed
| Name | Duffield Associates |
| License number | 4704C |
| License type | Class C (Engineered-Designer) |
| License status | Approved |
| Location | Wilmington, Delaware 19808 |
| Phone | (302) 674-9280 |
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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.
How to verify this license
We publish this listing exactly as it appears in Delaware's official licensing records; we do not vouch for the business itself. Before hiring, look up license #4704C 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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