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Scot McCaffrey

Septic contractor based in Mohnton, Berks County, PA

License details

Company	Systems Design Engineering, Inc.
License number	03421
License type	On-Lot System Installer (DEP training-recognition list)
License status	DEP-recognized on-lot system installer; most recent training update 2023-03-14 (a training-recognition list, not proof of a currently active license)
Based in	Mohnton, Berks County, Pennsylvania 19540

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

What this license covers

Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.

How to verify this license

We publish the license details exactly as they appear in the public licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #03421 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Source: PA DEP Act 537 - On-Lot Sewage System Installer training-recognition list, last checked 2026-08-16. Look it up at the issuing agency.

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