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Robert Wiesner PlumbingLicensed

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

License number	2394E3, 2394H
License type	Class E (System Contractor) · Class H (Systems Inspector)
License status	Approved
Based in	Newark, New Castle County, Delaware 19702

"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

Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.

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 #2394E3, 2394H 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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