---
title: "Derik Gallis, Title 5 System Inspector SI #15203 | Title 5 Roster"
description: "Derik Gallis is a MassDEP-approved Title 5 System Inspector (SI #15203) based in Westfield, MA. Approval expires July 1, 2029 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/derik-gallis-si15203/
---

# Derik Gallis, Title 5 System Inspector (SI #15203)

Derik Gallis is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #15203
* **Approval expires:** July 1, 2029
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Listed under own name
* **Based in:** Westfield, MA
* **County:** Hampden County

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