Sean J. O'Brien, Title 5 System Inspector (SI #14843)
Sean J. O'Brien is on the NEIWPCC list of MassDEP-approved Title 5 System Inspectors dated October 2, 2026 (SI #14843), based in Holland, MA. Approval on that list runs to November 1, 2026.
| SI number | #14843 |
|---|---|
| Approval expires | November 1, 2026 |
| Approved by | Massachusetts Department of Environmental Protection (MassDEP); list published by NEIWPCC |
| Business listing | Listed under own name |
| Based in | Holland, MA |
| County | Hampden 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.