| Company | Location | Certifications | License # |
|---|---|---|---|
| Adams Trackhoe Service | Mars Hill, NC | Installer (Level II) | 1476 |
| Adams Trackhoe Service | Mars Hill, NC | Inspector | 11124I |
| Anders Grading | Mars Hill, NC | Installer (Level II) | 1568 |
| B & M Property Solutions | Marshall, NC | Installer (Level IV) | 11582 |
| Benjamin Hall | Marshall, NC | Installer (Level II) | 9457 |
| Blue Ridge Elctrical Construction Llc | Mars Hill, NC | Installer (Level II) | 9455 |
| Boyds Grading | Hot Springs, NC | Installer (Level II) | 6029 |
| Brandon Silvers | Marshall, NC | Installer (Level II) | 6322 |
| Buck Creek Properties Inc | Marshall, NC | Installer (Level II) | 1541 |
| Buddy Jeffords Grading | Mars Hill, NC | Installer (Level II) | 1519 |
| Carr Grading | Mars Hill, NC | Installer (Level II) | 1490 |
| Casey Robinson Construction | Mars Hill, NC | Installer (Level II) | 1467 |
| Charles B Walker | Marshall, NC | Installer (Level II) | 8017 |
| Clifton D Hamlin Grading | Mars Hill, NC | Installer (Level IV) | 1585 |
| Cody & Cameron'S Grading & Excavation | Marshall, NC | Installer (Level II) | 6933 |
| Construction & Landscape Service Inc | Marshall, NC | Installer (Level IV) | 1481 |
| Cse Excavation | Marshall, NC | Installer (Level II) | 9724 |
| David Misson | Marshall, NC | Installer (Level II) | 15360 |
| Diltz Construction Inc | Mars Hill, NC | Installer (Level II) | 14346 |
| Dotson Grading | Mars Hill, NC | Installer (Level II) | 11997 |
| Edwin Alton Crowe | Marshall, NC | Installer (Level II) | 1497 |
| Finley Grading | Hot Springs, NC | Installer (Level II) | 1631 |
| Fred'S Handyman And Home Improvements | Marshall, NC | Installer (Level II) | 6050 |
| Freemans Construction & Cts Llc | Marshall, NC | Installer (Level II) | 1506 |
| Freemans Construction & Cts, Llc | Marshall, NC | Installer (Level II) | 5101 |
| J H Plumbing & Piping Inc | Mars Hill, NC | Installer (Level II) | 5571 |
| Jacob Swisher | Hot Springs, NC | Inspector | 9936I |
| Jon Jeffrey Christie | Marshall, NC | Installer (Level II) | 8077 |
| Lambs Landscape Plus Painting | Marshall, NC | Installer (Level II) | 14864 |
| Leonard Cutshall Llc | Marshall, NC | Installer (Level II) | 2106 |
| Levi Shelton | Mars Hill, NC | Installer (Level II) | 15405 |
| Lisenbee Excavating | Marshall, NC | Installer (Level IV) | 4991 |
| Marshall Stone Sales | Marshall, NC | Installer (Level II) | 4893 |
| Mayer Llc | Brightwood, NC | Installer (Level IV) | 11737 |
| Mcgowan Land Management Llc | Marshall, NC | Installer (Level II) | 14662 |
| Meadows Town Landworks Llc | Marshall, NC | Installer (Level II) | 15236 |
| Michael Robinson | Mars Hill, NC | Installer (Level II) | 9427 |
| Motivation Septic Services Llc | Marshall, NC | Installer (Level IV)Inspector | 4510 |
| Mountain Laurel Land Co | Leicester, NC | Installer (Level II) | 9560 |
| Pangles Construction | Hot Springs, NC | Installer (Level IV) | 1535 |
| Reed'S Contracting | Mars Hill, NC | Installer (Level II) | 9680 |
| Rickey Gosnell | Marshall, NC | Installer (Level II) | 5474 |
| Ridgeline Land Services | Marshall, NC | Installer (Level II) | 5713 |
| Roberts Building Stone | Marshall, NC | Installer (Level II) | 1547 |
| Roberts Building Stone & Landscape | Marshall, NC | Installer (Level II) | 9393 |
| Roberts Construction | Marshall, NC | Installer (Level II) | 1546 |
| Roy J Young Trucking & Grading | Mars Hill, NC | Installer (Level II) | 4841 |
| Sawyer'S Grading | Marshall, NC | Installer (Level II) | 7297 |
| Self'S Grading & Excavation Inc | Hot Springs, NC | Installer (Level II) | 5669 |
| Silver Construction | Marshall, NC | Installer (Level IV) | 5067 |
| Silver Construction | Marshall, NC | Installer (Level IV) | 1550 |
| Stonefly Excavating | Marshall, NC | Installer (Level II) | 7894 |
| Stuart Davis Excavating | Weaverville, NC | Installer (Level II) | 1500 |
| Tim Barr Construction Llc | Mars Hill, NC | Installer (Level II) | 14270 |
| Tommy Beall | Mars Hill, NC | Installer (Level II) | 3397 |
| Tommy Koloski Excavation | Marshall, NC | Installer (Level II) | 6662 |
| Trantham'S Grading | Hot Springs, NC | Installer (Level II) | 6026 |
| Travis Ball | Marshall, NC | Installer (Level II) | 14556 |
| Upland Grading & Septic Llc | Marshall, NC | Installer (Level IV)Inspector | 11290 |
| Wyatt'S Excavating | Mars Hill, NC | Installer (Level II) | 9609 |
| Zachary Crowder | Marshall, NC | Installer (Level II) | 11538 |
| Zenina Farms Inc | Marshall, NC | Installer (Level IV)Inspector | 4703 |
62 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Madison County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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