Harrison County · Pop. 46,319
Biloxi sits on a narrow barrier peninsula jutting into Mississippi Sound, one of the most geologically constrained septic environments in the American South. The city's sand-dominated soils offer rapid percolation but almost no pathogen treatment distance before wastewater reaches the Mississippi Sound watershed — a critical shellfish harvesting area managed by the Mississippi Department of Marine Resources. Harrison County has more than 45,000 on-site wastewater systems, many of them aging systems that predate current MSDH standards and the post-Katrina redesign of the Gulf Coast's built environment. Hurricane Katrina's August 2005 landfall near Biloxi destroyed or severely compromised thousands of septic systems through storm surge flooding, soil saturation, and direct structural damage — prompting MSDH to implement more stringent flood-resilient design requirements for all new and replacement systems in Harrison County's coastal flood zones. The combination of high water tables, hurricane risk, shellfish water quality sensitivity, and rapid coastal development makes Biloxi one of Mississippi's most technically demanding septic jurisdictions.
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 | $200 - $350 |
| Septic System Installation | $4,500 - $16,000 |
Harrison County coastal soils are dominated by Scranton-Prentiss-Myatt associations on the barrier island and back-barrier flats. Scranton loamy sand (loamy, siliceous, active, thermic Aquic Quartzipsamments) occupies the well-drained to somewhat excessively drained beach ridge and cheniere positions — highly sandy with rapid percolation but virtually no treatment capacity for pathogens. Prentiss fine sandy loam occupies slightly higher back-barrier positions with moderate percolation. Myatt fine sandy loam fills the lowest positions — poorly drained, with a seasonal high water table within 6–12 inches of the surface for most of the year. Tidal marsh soils (Tidal Flats, Estero series) immediately behind the shoreline have organic-rich, permanently saturated profiles unsuitable for any on-site wastewater system without extensive engineering.
The fundamental septic challenge on Biloxi's barrier peninsula is the conflict between two opposite soil problems: the high-percolation Scranton and Prentiss sandy soils on ridge positions allow rapid drainage but provide only inches of treatment distance before wastewater reaches the water table and migrates to the Sound; meanwhile, the Myatt fine sandy loam soils in back-barrier flats have water tables so shallow (6–12 inches) that no conventional drain field can maintain required separation distances. MSDH requires a minimum 18-inch separation from the bottom of a drain field to the seasonal high water table — a standard that Myatt soils violate across most of the coastal plain. USDA NRCS Web Soil Survey maps the Biloxi peninsula as dominated by Scranton-Prentiss-Myatt complexes with Tidal Flats along the water margins. On buildable lots where Myatt soils predominate, mound systems elevated on clean sand fill 2–4 feet above natural grade are the only compliant option, and the mound itself must be designed to withstand at least a 10-year storm event without flooding.
MSDH Office of Environmental Health administers on-site wastewater permitting in Harrison County through the Harrison County Health Department at 180 Debuys Road in Gulfport. Mississippi's On-Site Wastewater Disposal Law (Mississippi Code 41-67) and the State Board of Health's Rules and Regulations for Individual Onsite Wastewater Disposal Systems govern all system design and installation. Harrison County properties within FEMA Special Flood Hazard Areas — which includes most of Biloxi's barrier peninsula below the 12-foot elevation contour — must use flood-resistant septic design: tanks must be anchored to a concrete deadman or slab with stainless steel strapping per FEMA Technical Bulletin 1-93, and pump chambers in VE zones (coastal velocity zones) must be elevated above the Base Flood Elevation. The Mississippi Department of Environmental Quality (MDEQ) Coastal Zone Management Program has consistency review authority over systems near the Mississippi Sound shoreline. MSDH may require nitrogen-reducing advanced treatment systems for new installations within 300 feet of the Sound to protect shellfish harvesting classification in Harrison County coastal waters.
Harrison County septic permits are issued by the Harrison County Health Department under Mississippi State Department of Health (MSDH) authority, Office of Environmental Health. All on-site wastewater systems require a permit under Mississippi Code Section 41-67. A site evaluation including soil morphology analysis and percolation testing must be conducted by an MSDH environmental specialist or a registered sanitarian before permitting. Harrison County properties within FEMA Special Flood Hazard Areas (Zones AE, VE) — which encompasses most of Biloxi's coastal plain — require MSDH review of flood-resistant design, including tank anchoring per FEMA Technical Bulletin 1-93 and elevated system components where necessary. Permit fees range $75–$200 at the county level. Systems within the Mississippi Sound watershed may require MDEQ coastal zone consistency review. Hurricane-damaged systems must be inspected and permitted as new before restoration.