---
title: "Ernest J. Mathieu, Title 5 System Inspector SI #4928 | Title 5 Roster"
description: "Ernest J. Mathieu is a MassDEP-approved Title 5 System Inspector (SI #4928) based in Chicopee, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/ernest-j-mathieu-si4928/
---

# Ernest J. Mathieu, Title 5 System Inspector (SI #4928)

Ernest J. Mathieu is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #4928
* **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:** Chicopee, MA
* **County:** Hampden County

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