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Duffield AssociatesLicensed

Licensed septic contractor based in Wilmington, New Castle County, DE

License number	4704C
License type	Class C (Engineered-Designer)
License status	Approved
Based in	Wilmington, New Castle County, Delaware 19808

"Based in" is the city and county of the address on the business's 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.

How to verify this license

We publish the license details exactly as they appear in the official licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #4704C directly with the agency that issued it, 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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