---
title: "Douglas E. Cooper, Title 5 System Inspector SI #2857 | Title 5 Roster"
description: "Douglas E. Cooper is a MassDEP-approved Title 5 System Inspector (SI #2857) based in Edgartown, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/douglas-e-cooper-si2857/
---

# Douglas E. Cooper, Title 5 System Inspector (SI #2857)

Douglas E. Cooper is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #2857
* **Approval expires:** June 30, 2028
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Listed under own name
* **Based in:** Edgartown, MA
* **County:** Dukes County

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