Forrest County · Pop. 48,986
Hattiesburg is the largest city in Mississippi's Pine Belt region, home to the University of Southern Mississippi and Forrest General Hospital, the state's second-largest hospital. The city's position in the Longleaf Pine Coastal Plain gives it some of Mississippi's best-draining soils — the Ruston and McLaurin fine sandy loams that dominate the upland landscape allow excellent conventional septic system function, a significant contrast to the problematic Yazoo clay belt in central Mississippi and the saturated coastal soils of the Gulf Coast. This soil advantage makes Hattiesburg one of Mississippi's more favorable environments for on-site wastewater systems, and the city's regional growth has been supported by the relative ease of septic permitting compared to other parts of the state. However, the city's high annual rainfall — 62 inches, among the highest in the state — and the lower terrain soils that do have drainage constraints require homeowners to understand their specific site conditions. The University of Southern Mississippi's presence creates a sizeable student rental housing market where higher-than-average occupancy accelerates system wear, and Hattiesburg's role as a regional medical and commercial hub drives steady commercial development with engineering-grade system requirements.
Restore or replace failed leach fields and drain lines to prevent sewage surfacing and groundwater contamination.
$2,000 – $15,000
Commercial grease trap cleaning and pumping to prevent sewer blockages and maintain health code compliance.
$200 – $800
Comprehensive evaluation of your septic system's condition, required for real estate transactions in most states.
$300 – $600
Complete new septic system design and installation, from perc testing to final inspection.
$3,500 – $20,000
Regular pumping removes accumulated solids from your septic tank, preventing backups and extending system life.
$275 – $600
Diagnose and fix septic system problems including leaks, clogs, baffle failures, and component replacements.
$500 – $5,000
Professional water well drilling for residential and commercial properties without access to municipal water.
$6,000 – $25,000
Diagnose and repair well pump failures, pressure tank issues, and water flow problems.
$300 – $3,000
Biloxi, MS 00000
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| Service | Average Cost |
|---|---|
| Septic Tank Pumping | $225 - $415 |
| Septic System Installation | $4,500 - $15,000 |
Forrest County soils are Coastal Plain Ultisols — Ruston fine sandy loam, Susquehanna clay, and McLaurin fine sandy loam as dominant series. Ruston fine sandy loam is a well-drained Ultisol with argillic Bt horizon at 12-24 inches, clay content 25-35%, and excellent drainage on upland positions with water tables at 48-72 inches. McLaurin fine sandy loam is even better-drained with lighter-textured Bt. Susquehanna clay is a poorly structured, slowly permeable clay series that can create problematic drain field conditions on certain upland positions despite adequate water table depth. Lower terrain carries Myatt silt loam and Leaf clay — poorly drained soils with water tables within 12-24 inches.
Ruston fine sandy loam is the USDA benchmark well-drained Ultisol of the Southern Coastal Plain, widely studied for its suitable percolation characteristics for on-site wastewater. The argillic Bt horizon at 12-24 inches has moderate clay content (25-35%) that provides treatment capacity without restricting drainage to the slow range found in Piedmont clay soils. The deep water table (48-72+ inches) on upland Ruston positions means seasonal saturation is not a design concern, and the sandy loam texture above the argillic horizon allows rapid initial infiltration. McLaurin fine sandy loam, even lighter-textured, is similarly favorable but has even less clay in the Bt horizon and requires conservative loading rates to ensure treatment adequacy. Susquehanna clay, which forms in wetter landscape positions, has a massive, slowly permeable argillic horizon that can create perched water conditions even on apparently upland positions.
Forrest County Health Department enforces Mississippi's On-Site Wastewater Disposal rules under MS Code 41-67 and MSDH regulations. Site evaluations require both soil morphology assessment and percolation testing. Ruston and McLaurin soils on appropriate lots typically support conventional gravity systems. Susquehanna clay and Myatt silt loam soils require engineered designs. Setbacks: 75 feet from water supply wells, 50 feet from surface water, 10 feet from property lines. MSDH Licensed Installer Certificate required for all installation work. Commercial and multi-family developments require MSDH Engineering Section review.
Forrest County Health Department (Mississippi State Department of Health) issues On-Site Wastewater Disposal System permits under MS Code 41-67. Site evaluation includes soil morphology and percolation testing. The University of Southern Mississippi's approximately 14,000 students drive a rental housing market with significant septic usage. Hattiesburg's growth as a regional hub for the Pine Belt region creates steady permit demand. MSDH licensed installers required for all work.
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