---
title: "Daniel Ottenheimer, Title 5 System Inspector SI #291 | Title 5 Roster"
description: "Daniel Ottenheimer is a MassDEP-approved Title 5 System Inspector (SI #291) based in Gloucester, MA. Approval expires June 30, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/daniel-ottenheimer-si291/
---

# Daniel Ottenheimer, Title 5 System Inspector (SI #291)

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

* **SI number:** #291
* **Approval expires:** June 30, 2028
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Mill River Consulting
* **Based in:** Gloucester, MA
* **County:** Essex County

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