How to Get a Septic Permit in MS: Step-by-Step Guide for Hattiesburg-Area Homeowners

Whether you are installing a new septic system on a vacant lot, replacing a failed system, or making major repairs that trigger permit requirements, navigating the MS septic permitting process correctly is essential. Here is the step-by-step process for Forrest and Lamar County properties.

Step 1: Site Evaluation Application

The permitting process begins with a site evaluation application to your county health department — Forrest County Health Department for Hattiesburg and Petal-area properties, Lamar County Health Department for Oak Grove, Purvis, and Sumrall-area properties. The application requires property description and ownership documentation, proposed system use information, and a fee that typically runs $150 to $400.

Step 2: Soil Evaluation and Perc Testing

After application acceptance, a soil scientist or licensed evaluator conducts a site evaluation including soil profile examination and percolation testing. This evaluation typically takes 2 to 4 hours on-site and must occur during appropriate soil moisture conditions.

Step 3: System Design

Based on soil evaluation results, a licensed designer develops a system design specifying tank size, drainfield area, setback compliance, and if required, alternative system type. For alternative systems requiring engineered designs, this step can take 2 to 4 weeks and add $500 to $2,000 in design fees.

Step 4: Permit Issuance and Installation

With design approved, the health department issues a construction permit. Installation must be performed by a licensed contractor matching the approved design. Substitutions in materials or layout require health department approval before implementation.

Step 5: Final Inspection and Approval

After installation, the health department inspector must inspect and approve the system before it is covered and put into service. The inspector verifies installation matches the permitted design, all components meet specifications, and setback requirements are satisfied. Approval is documented and filed — this documentation is the record that future owners will rely on.