| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron Hall | Parowan, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04559-OSP |
| CD Consulting Engineers, Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03098-OSP |
| Gem Engineering, Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 02135-OSP |
| GEM Engineering, Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 02971-OSP |
| Kolob Construction & Produce LLC | St. George, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 03307-OSP |
| New Horizon Eng. & Surv. | Enoch, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 00354-OSP |
| Oracle Group Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03753-OSP |
| Oracle Group Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03755-OSP |
| Oracle Group Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03757-OSP |
| Reliant Engineering | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 04461-OSP |
| Southwest UT Public Health Dept. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03936-OSP |
| Southwest Utah Public Health Dept. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 00112-OSP |
| Southwest Utah Public Health Dept. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03579-OSP |
| Watson Engineering Company Inc. | Cedar City, UT | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 02030-OSP |
14 companies in the Utah DEQ certified onsite wastewater system professionals list are based in Iron County as of 2026-07-23. Companies based elsewhere in Utah also commonly serve the county.
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