| Company | Location | Certifications | License # |
|---|---|---|---|
| Box Elder School District | Brigham City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 02606-OSP |
| John Rae Excavation | Elmwood, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04370-OSP |
| Mark Rees | Brigham City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 02767-OSP |
| MEJ Engineering | Mendon, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04295-OSP |
4 companies in the Utah DEQ certified onsite wastewater system professionals list are based in Box Elder County as of 2026-07-23. Companies based elsewhere in Utah also commonly serve the county.
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