John A. Wallen, Title 5 System Inspector (SI #13641)
John A. Wallen is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026 (SI #13641), based in Chesterfield, MA. Approval on that list runs to June 30, 2028.
| SI number | #13641 |
|---|---|
| Approval expires | June 30, 2028 |
| Approved by | Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC |
| Business listing | The Engineer Group LLC |
| Based in | Chesterfield, MA |
| County | Hampshire County |
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Source: NEIWPCC System Inspector list, retrieved 2026-10-12. No phone or email is published on the source list. A listing is not an endorsement.