---
title: "Sean J. O'Brien, Title 5 System Inspector SI #14843 | Title 5 Roster"
description: "Sean J. O'Brien is a MassDEP-approved Title 5 System Inspector (SI #14843) based in Holland, MA. Approval expires November 1, 2026 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/sean-j-o-brien-si14843/
---

# Sean J. O'Brien, Title 5 System Inspector (SI #14843)

Sean J. O'Brien is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #14843
* **Approval expires:** November 1, 2026
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Listed under own name
* **Based in:** Holland, MA
* **County:** Hampden County

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