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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| M&D Plumbing | Ethel, LA | — | Installer (Basic)Installer (Combination) | 31686 |
| M&M Treatment Plant Systems | Belle Rose, LA | — | Installer (Basic)Installer (Combination)Installer (Maintenance) | 30372 |
| M&R Sewer | Marksville, LA | — | Installer (Basic)Installer (Combination) | 30144 |
| Manuel's Septic and Portalets | Eunice, LA | — | Installer (Basic)Installer (Combination) | 32259 |
| Marchand Plumbing | Duplessis, LA | — | Installer (Basic)Installer (Combination) | 596 |
| Mark Johnson and Sons Plumbing | Ruston, LA | — | Installer (Basic)Installer (Combination) | 31795 |
| Mark Johnson and Sons Plumbing | Ruston, LA | — | Installer (Basic)Installer (Combination) | 32461 |
| Mark Johnson and Sons Plumbing | Ruston, LA | — | Installer (Basic)Installer (Combination) | 40058 |
| Mark Johnson and Sons Plumbing | Ruston, LA | — | Installer (Basic)Installer (Combination) | 40088 |
| Mark Kennedy Plumbing, LLC | Jonesboro, LA | — | Installer (Basic)Installer (Combination) | 31611 |
| Martel and Associates | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 281 |
| Martel Construction LLC | Eunice, LA | — | Installer (Basic)Installer (Combination) | 31127 |
| MCS Group LLC | Spearsville, LA | — | Installer (Basic)Installer (Combination)Installer (Maintenance) | 40097 |
| Meaux's Tank Service LLC | Ruston, LA | — | Installer (Basic)Installer (Combination) | 31861 |
| Meaux's Tank Service LLC | Ruston, LA | — | Installer (Basic)Installer (Combination) | 32256 |
| Meaux's Tank Service LLC | Ruston, LA | — | Installer (Basic)Installer (Combination) | 32265 |
| Mega Works LLC | Lakeland, LA | — | Installer (Basic)Installer (Combination) | 40075 |
| Melvin Joubert Construction | Opelousas, LA | — | Installer (Basic)Installer (Combination) | 30382 |
| Michael Nugent Backhoe Services | Deville, LA | — | Installer (Basic)Installer (Combination) | 320 |
| Michael Nugent Backhoe Services | Deville, LA | — | Installer (Basic)Installer (Combination) | 32420 |
| Michelli Septic Installation and Maintenance | Covington, LA | — | Installer (Basic)Installer (Combination) | 31721 |
| Mike Dlugosh | Choudrant, LA | — | Installer (Basic)Installer (Combination) | 32120 |
| Mike's Water Wells, LLC | Coushatta, LA | — | Installer (Basic)Installer (Combination) | 30207 |
| Molinary Construction LLC | Violet, LA | — | Installer (Basic)Installer (Combination) | 32496 |
| Moore Brothers Pumping, LLC | Many, LA | — | Installer (Basic)Installer (Combination) | 31902 |
| Moore Brothers Pumping, LLC | Many, LA | — | Installer (Basic)Installer (Combination) | 891 |
| Morgan Water Services | Coushatta, LA | — | Installer (Basic)Installer (Combination) | 32487 |
| Morrison Sewer Systems LLC | Anacoco, LA | — | Installer (Basic)Installer (Combination) | 32430 |
| Morrison Sewer Systems LLC | Anacoco, LA | — | Installer (Basic)Installer (Combination) | 633 |
| Mott Sewer & Dirtwork LLC | Bell City, LA | — | Installer (Basic)Installer (Combination) | 32264 |
| MR Septic Tank Installation Services, LLC | Convington, LA | — | Installer (Basic)Installer (Combination) | 40055 |
| Murphy Cormier General Contractor Inc. | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 40111 |
| Murphy Cormier General Contractor Inc. | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 40112 |
| Murphy Cormier general Contractor LLC | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 30478 |
| Murphy Cormier general Contractor LLC | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 40035 |
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