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Duffield Assicoates, IncLicensed

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

License number	2089D3, 2089B
License type	Class B (Standard-Designer) · Class D (Site Evaluator)
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.
Site testing: licensed to run percolation tests and evaluate soils to determine what kind of system a site can support.

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 #2089D3, 2089B 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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