| Company | Location | Certifications | License # |
|---|---|---|---|
| Adamson Construction & Investment | Columbia, MO | Installer (Level Advanced) | 38311 |
| Advanced Septic & Pumping | St. Thomas, MO | Installer (Level Advanced) | 36109 |
| Advanced Septic & Pumping | St. Thomas, MO | Installer (Level Advanced) | 37785 |
| Affordable Plumbing Maintenance Llc | Boonville, MO | Installer (Level Advanced) | 39023 |
| Affordable Plumbing, Sewer, And Drain Cleaning | Jefferson City, MO | Installer (Level Basic) | 37406 |
| Agee Plumbing | Huntsville, MO | Installer (Level Advanced) | 30606 |
| All Clear Pumping & Sewer | Centertown, MO | Installer (Level Basic) | 38592 |
| Atelier I70 | Columbia, MO | Installer (Level Advanced) | 39310 |
| Brian Wear Plumbing | Columbia, MO | Installer (Level Basic) | 39438 |
| Brian Wear Plumbing | Columbia, MO | Installer (Level Advanced) | 39420 |
| Bylo Acres | Henley, MO | Installer (Level Basic) | 38891 |
| Bylo Acres Excavation And Grading | Henley, MO | Installer (Level Advanced) | 39068 |
| Carman Resources | Eldon, MO | Installer (Level Advanced) | 39345 |
| Carpenter Earthworks Llc | California, MO | Installer (Level Basic) | 39521 |
| Cedar Creek Dirt Works Llc | Ashland, MO | Installer (Level Basic) | 37397 |
| Cole Holleman | — | Installer (Level Advanced) | 36721 |
| Corey Myers Construction Llc | Ashland, MO | Installer (Level Advanced) | 37954 |
| Courtney Construction Company Llc. | Sunrise Beach, MO | Installer (Level Basic) | 38698 |
| Cw Lillig Contracting | Columbia, MO | Installer (Level Advanced) | 38586 |
| Dana Austin | — | Installer (Level Advanced) | 38862 |
| Darrell Wilbers Exc. Inc. | Jefferson City, MO | Installer (Level Basic) | 31250 |
| David Fromme Excavating, Llc | Holt Summit, MO | Installer (Level Basic) | 35759 |
| Double D. Dirtworks Llc | Fayette, MO | Installer (Level Basic) | 39017 |
| Double J Excavating | Clark, MO | Installer (Level Basic) | 37726 |
| Foiles Trucking Llc | Jerseyville, MO | Installer (Level Advanced) | 38062 |
| Gbk Excavating | Sturgeon, MO | Installer (Level Basic) | 36267 |
| Haskamp Excavation | Rocheport, MO | Installer (Level Basic) | 38772 |
| Imhoff Dozing & Trenching | — | Installer (Level Advanced) | 33425 |
| Jacober Excavating Llc | Hartsburg, MO | Installer (Level Basic) | 38846 |
| Jennings Enterprises | Hartsburg, MO | Installer (Level Basic) | 33429 |
| Jonathan Gray | — | Installer (Level Basic) | 39011 |
| Judson Brady | Rocky Mount, MO | Installer (Level Basic) | 39006 |
| Kevin Sublett Excavating | Harrisburg, MO | Installer (Level Basic) | 32627 |
| Koenigsfeld Excav | Centertown, MO | Installer (Level Basic) | 36982 |
| Korte Excavation | Russellville, MO | Installer (Level Basic) | 39114 |
| Lehman Excavation & Ground Services | Jefferson City, MO | Installer (Level Basic) | 38961 |
| Luke Sandbothe Bobcat Service | Jefferson City, MO | Installer (Level Advanced) | 37334 |
| Mark'S Lawn Care And Landscaping Llc | Fulton, MO | Installer (Level Basic) | 39382 |
| Mastertech Plumbing | Columbia, MO | Installer (Level Advanced) | 35837 |
| Matt Kliethermes Excavating Llc | Jefferson City, MO | Installer (Level Basic) | 37558 |
| Matt Rademan Co Llc | Jefferson City, MO | Installer (Level Basic) | 35764 |
| Michael Moeller Bobcat & Backhoe Service, Llc | Lohman, MO | Installer (Level Advanced) | 32123 |
| Mid-Mo Environmental | Jefferson City, MO | Installer (Level Advanced) | 31575 |
| Midwest Outdoor Solutions Llc | Jefferson City, MO | Installer (Level Basic) | 39442 |
| Mike'S Septic & Dirtwork Llc | Foley, MO | Installer (Level Advanced) | 35268 |
| Milam Contracting | Columbia, MO | Installer (Level Basic) | 36505 |
| Milam Contracting | Columbia, MO | Installer (Level Basic) | 37717 |
| Milam Contracting | Columbia, MO | Installer (Level Advanced) | 36249 |
| Milam Contracting | Columbia, MO | Installer (Level Basic) | 37277 |
| Nontypical Outdoor Solutions | Fulton, MO | Installer (Level Basic) | 38926 |
| Rick Richardson Excavating | Hartsburg, MO | Installer (Level Basic) | 32654 |
| Robbey D Harvey Gen Carpentry | New Franklin, MO | Installer (Level Advanced) | 38771 |
| Roettgen Excavating Llc | New Bloomfield, MO | Installer (Level Advanced) | 36887 |
| S & L Trenching | Huntsville, MO | Installer (Level Basic) | 39493 |
| Shay Mechanical | Boonville, MO | Installer (Level Advanced) | 38337 |
| Terraform Excavation | Columbia, MO | Installer (Level Basic) | 38768 |
| Thoma Construction Llc | Columbia, MO | Installer (Level Advanced) | 35855 |
| Thomas Colter | Holts Summit, MO | Installer (Level Basic) | 39134 |
| Todd Mcdonald | Prairie Home, MO | Installer (Level Basic) | 38587 |
| Tree Frog Ventures Llc | Ashland, MO | Installer (Level Basic) | 38684 |
| Tw Colton Plumbing And Excavating Inc. | Columbia, MO | Installer (Level Advanced) | 31264 |
| Vital Home Inspections Llc | Jefferson City, MO | Installer (Level Basic) | 39275 |
| Wendling & Son'S | Woolridge, MO | Installer (Level Advanced) | 39347 |
| Wilson Excavating | Meta, MO | Installer (Level Advanced) | 37463 |
| Wood Unlimited | Columbia, MO | Installer (Level Basic) | 33491 |
65 companies in the Missouri DHSS registered OWTS installer list are based in Boone County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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