---
title: "William M. Austin, Title 5 System Inspector SI #3464 | Title 5 Roster"
description: "William M. Austin is a MassDEP-approved Title 5 System Inspector (SI #3464) based in Tisbury, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/william-m-austin-si3464/
---

# William M. Austin, Title 5 System Inspector (SI #3464)

William M. Austin is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #3464
* **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:** Tisbury, MA
* **County:** Dukes County

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