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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| H & H Septic And Excavation | Blue Mountain, MS | — | Installer | — |
| H & H Septic Services | Mccomb, MS | — | InstallerPumper | — |
| H&H Concrete Products | Leakesville, MS | — | Installer | — |
| Haf To Go | Starkville, MS | — | Pumper | — |
| Hagan Construction Services, Llc | Meridian, MS | — | Installer | — |
| Hales Septic Tank Service | Jackson, MS | — | InstallerPumper | — |
| Hand G Construction, Llc | Iuka, MS | — | Installer | — |
| Hanna Construction & Septic Tank Services, Llc | Houston, MS | — | Installer | — |
| Harolds Plumbing, Llc | Picayune, MS | — | Installer | — |
| Harris Septic Tank Service, Llc | Muscle Shoals, AL | — | InstallerPumper | — |
| Harrison Plumbing Company | Mathiston, MS | — | Installer | — |
| Harrison Septic Tanks | Blue Mountain, MS | — | Installer | — |
| Harvey Services, Inc | Morton, MS | — | Installer | — |
| Hawkes, Brandon (Probationary) | Guntown, MS | — | Installer | — |
| Haynes Development Llc | Como, MS | — | Installer | — |
| Heavy Duty Pumping & Septic | Lucedale, MS | — | InstallerPumper | — |
| Heavy Duty Pumping & Septic, Llc | Lucedale, MS | — | InstallerPumper | — |
| Helena Enterprises, Llc | Escatawpa, MS | — | Installer | — |
| Hensley R. Lee Contracting, Inc.. | Carriere, MS | — | Installer | — |
| Heritage Nursery & Lanscaping | Jackson, MS | — | Installer | — |
| Herron Construction Company | Charleston, MS | — | Installer | — |
| Hibley Enterprises Llc | Sumrall, MS | — | Installer | — |
| Hill Enterprises Inc Dba Roto Rooter | Marion, MS | — | Installer | — |
| Hill'S Electric & Plumbing | Columbus, MS | — | Pumper | — |
| Hillard'S Septic Service, Llc | Pearl, MS | — | Pumper | — |
| Hindman Plumbing & Water | Louisville, MS | — | Installer | — |
| Hobden Management & Maintenance, Llc | Meridian, MS | — | Installer | — |
| Hodges Plumbing & More Llc | Pickens, MS | — | Installer | — |
| Hogue, Christopher L | Pontotoc, MS | — | Installer | — |
| Holliday & Son Construction | Sardis, MS | — | Installer | — |
| Hollinsworth, Garret | Pascagoula, MS | — | InstallerPumper | — |
| Holly Jaudon, General Contractor | Pope, MS | — | Installer | — |
| Homestead Services Llc | Hattiesburg, MS | — | Installer | — |
| Homochitto Camp-Out | Meadville, MS | — | Installer | — |
| Horn Builders Ms, Llc | Tishomingo, MS | — | Installer | — |
| Horton'S Plumbing Service | Newton, MS | — | Installer | — |
| Hosemann Septic Service | Edwards, MS | — | Installer | — |
| Hoskins Mid-South Plumbing Inc | Batesville, MS | — | Installer | — |
| Hp Construction, Llc | Meridian, MS | — | Installer | — |
| Hubert Septic Services | Vicksburg, MS | — | Installer | — |
| Hughes Septic Systems Llc | Byhalia, MS | — | Installer | — |
| Hunter'S Septic | Saucier, MS | — | Installer | — |
| Hunter'S Septic Service | Nesbit, MS | — | InstallerPumper | — |
| Hurtt Plumbing | Meridian, MS | — | Installer | — |
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