| Company | Location | Certifications | License # |
|---|---|---|---|
| Engineered Environmental Inc | Califon Boro, NJ | Cathodic Protection SpecialistClosureInstallation-Entire UST SystemSubsurface EvaluationTank Testing | US00878 |
| Ferreira Construction Company Inc | Readington Twp, NJ | ClosureSubsurface Evaluation | US425571 |
| In Earth Excavating & Contracting Inc | Frenchtown Boro, NJ | Closure | US493670 |
| Sme - Uhl & Associates | Lambertville City, NJ | Subsurface Evaluation | US562699 |
| Stem Brothers Inc | Alexandria Twp, NJ | ClosureInstallation-Entire UST System | US00419 |
| WILLOW GROVE CONSULTING, LLC d/b/a PENN JERS | Milford Boro, NJ | ClosureSubsurface Evaluation | US00577 |
| Wyatt Construction LLC | East Amwell Twp, NJ | Closure | US1062677 |
7 companies in the NJDEP UST certification program are based in Hunterdon County as of 2026-07-17. Companies based elsewhere in New Jersey also commonly serve the county.
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