---
title: "Mark R. Johnson, Title 5 System Inspector SI #15013 | Title 5 Roster"
description: "Mark R. Johnson is a MassDEP-approved Title 5 System Inspector (SI #15013) based in Paxton, MA. Approval expires April 1, 2028 per the NEIWPCC list."
canonical: https://title5roster.com/inspectors/mark-r-johnson-si15013/
---

# Mark R. Johnson, Title 5 System Inspector (SI #15013)

Mark R. Johnson is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026.

* **SI number:** #15013
* **Approval expires:** April 1, 2028
* **Approved by:** Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC
* **Business listing:** Listed under own name
* **Based in:** Paxton, MA
* **County:** Worcester County

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