---
title: "John C. Duncan, Title 5 System Inspector SI #2308 | Title 5 Roster"
description: "John C. Duncan is a MassDEP-approved Title 5 System Inspector (SI #2308) based in Essex, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/john-c-duncan-si2308/
---

# John C. Duncan, Title 5 System Inspector (SI #2308)

John C. Duncan is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #2308
* **Approval expires:** June 30, 2028
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Duncan Tree Landscape & Constr.
* **Based in:** Essex, MA
* **County:** Essex County

Source: https://neiwpcc.org/wp-content/uploads/2026/10/SI-Instate-10.2.2026.pdf (retrieved 2026-10-12)