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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| L6 Enterprises LLC | Monticello, UT | — | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 02516-OSP |
| Lake Shore Pumping | Spanish Fork, UT | Uintah | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 04280-OSP |
| Lake Shore Pumping Service | Spanish Fork, UT | Uintah | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 04315-OSP |
| Lance Valentine | Green River, UT | Uintah | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 02120-OSP |
| Landmark Testing & Engineering | St. George, UT | Washington | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 03401-OSP |
| Landmark Testing & Engineering | St. George, UT | — | Onsite Wastewater Professional (Level 1) | 04051-OSP |
| Landmark Testing and Engineering | St. George, UT | — | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 03816-OSP |
| Lariat Buildling Llc. | Roosevelt, UT | Duchesne | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03926-OSP |
| Latham Excavation & Services, LLC | Kamas, UT | — | Onsite Wastewater Professional (Level 1) | 04273-OSP |
| Legend Engineering | Wallsburg, UT | — | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04058-OSP |
| LeGrand Jensen Inc. | Tooele, UT | — | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 02385-OSP |
| Level 3 Septic LLC | Ogden, UT | — | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04217-OSP |
| Lincoln County Planning | Kemmerer, UT | Out of State | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04390-OSP |
| Lincoln County Planning & Development | Etna, UT | Out of State | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2) | 03946-OSP |
| Living in Sundance LLC | Pleasant Grove, UT | Uintah | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 03066-OSP |
| Lost Creek Contracting Co. | Croydon, UT | Morgan | Onsite Wastewater Professional (Level 1)Onsite Wastewater Professional (Level 2)Onsite Wastewater Professional (Level 3) | 04275-OSP |
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