| Company | Location | Certifications | License # |
|---|---|---|---|
| Ab Construction & Grading Llc | Hickory, NC | Installer (Level II) | 9508 |
| Adrian Narciso Leiva | Maiden, NC | Installer (Level IV)Inspector | 7955 |
| Andrew Davis | Maiden, NC | Installer (Level II) | 12022 |
| Andrew Moretz | Newton, NC | Installer (Level II) | 14669 |
| Aussie Contracting Llc | Terrell, NC | Installer (Level II) | 11740 |
| Bakers Landscaping | Conover, NC | Installer (Level II) | 1767 |
| Bass Grading Inc | Maiden, NC | Installer (Level IV)Inspector | 1019 |
| Brendle'S Grading & Septic Tank | Vale, NC | Installer (Level II) | 9050 |
| Bumgarner Septic Tank & Grading | Granite Falls, NC | Installer (Level IV)Inspector | 2688 |
| Carolina Landscape & Grading Llc | Catawba, NC | Installer (Level II) | 9917 |
| Carolina Landscape & Grading Llc | Catawba, NC | Installer (Level II) | 9782 |
| Catawba Grading Llc | Catawba, NC | Installer (Level IV) | 9262 |
| Charles Beatty Grading Llc | Sherrills Ford, NC | Installer (Level IV)Inspector | 1026 |
| Cloverdale Farms Llc | Conover, NC | Installer (Level IV) | 11475 |
| Cool Park Pumping Inc | Conover, NC | Installer (Level IV)Inspector | 1099 |
| Cool Park Pumping Inc | Conover, NC | Installer (Level IV)Inspector | 9504 |
| Cove Creek Land Solutions Llc | Maiden, NC | Installer (Level IV) | 9355 |
| Dannie Brown | Newton, NC | Installer (Level II) | 14776 |
| Darryl Cook | Hickory, NC | Installer (Level II) | 11227 |
| Elmer R Evans | Catawba, NC | Installer (Level II) | 14599 |
| First Call Septic Llc | Hickory, NC | Installer (Level IV)Inspector | 6663 |
| Guillermo Lopez | Denver, NC | Installer (Level II) | 9972 |
| Hoard Home Inspections Llc | Catawba, NC | Inspector | 9703I |
| J Plumbing | Hickory, NC | Installer (Level II) | 11649 |
| Jr Enterprises | Vale, NC | Installer (Level II) | 6174 |
| Justin Allen Freeze | Maiden, NC | Installer (Level II) | 14040 |
| Justin Merique | Hickory, NC | Installer (Level II) | 15473 |
| Kale Septic And Grading Llc | Claremont, NC | Installer (Level II) | 11160 |
| Lb'S Tree Solutions | Statesville, NC | Installer (Level II) | 11699 |
| Leatherman'S Septic Tank Ser Inc | Lincolnton, NC | Installer (Level IV)Inspector | 1111 |
| Leathermans Septic Tank Ser Inc | Lincolnton, NC | Installer (Level IV) | 3769 |
| Leveline | Newton, NC | Installer (Level II) | 11036 |
| Leveline | Newton, NC | Installer (Level IV) | 1789 |
| Maiden Grading & Septic Tank | Maiden, NC | Installer (Level II) | 2607 |
| Max'S Digging Service | Conover, NC | Installer (Level IV) | 1127 |
| Msi | Catawba, NC | Installer (Level II) | 9988 |
| Neil Yoder Grading & Landscaping | Hickory, NC | Installer (Level IV)Inspector | 4594 |
| Overdrive Clearing And Grading | Newton, NC | Installer (Level IV) | 9340 |
| Perfect Edge Fencing & Landscape Design | Hickory, NC | Installer (Level II) | 9372 |
| Prime Coatings | Hickory, NC | Installer (Level II) | 15201 |
| Redline Dirtworks | Newton, NC | Installer (Level II) | 9996 |
| Reflection Homes Nc Llc | Hickory, NC | Installer (Level IV) | 9698 |
| Robert Stamey | Maiden, NC | Installer (Level II) | 15493 |
| Robert Wigley | Catawba, NC | Installer (Level II) | 14949 |
| Rockett Grading | Newton, NC | Installer (Level II) | 14650 |
| Rockett Grading & Land Management Inc | Newton, NC | Installer (Level II) | 14696 |
| Sheffield Precision Building | Newton, NC | Installer (Level II) | 7272 |
| Sipe Grading Llc | Claremont, NC | Installer (Level II) | 5771 |
| Smith Mine | Maiden, NC | Installer (Level II) | 14712 |
| Southern Siteworks And Hauling | Catawba, NC | Installer (Level IV) | 11309 |
| Speagle'S Grading | Lincolnton, NC | Installer (Level IV) | 3768 |
| Superior Supply Warehouse | Vale, NC | Installer (Level II) | 11204 |
| Table Rock Grading And Construction Llc | Hickory, NC | Installer (Level II) | 7218 |
| Wastewater Solutions And Design | Maiden, NC | Installer (Level IV)Inspector | 3137 |
| Zachary James Crowell | Maiden, NC | Installer (Level IV) | 9942 |
55 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Catawba County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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