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Septic Services in Biloxi, MS

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.

Septic Providers in Biloxi (9)

Services in Biloxi

Drain Field Repair

$2,000 – $15,000

Grease Trap Pumping

$200 – $800

Septic Inspection

$300 – $600

Septic System Installation

$3,500 – $20,000

Septic Tank Pumping

$275 – $600

Septic Repair

$500 – $5,000

Well Drilling

$6,000 – $25,000

Well Pump Repair

$300 – $3,000

Well Water Testing

$50 – $500

Well Water Treatment

$500 – $8,000

Septic Service Costs in Biloxi

Service Average Cost
Septic Tank Pumping $200 - $350
Septic System Installation $4,500 - $16,000

Soil Conditions

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.

Water Table: Harrison County's coastal position creates exceptionally shallow water tables across much of the landscape. Myatt and related poorly drained soils have seasonal high water tables within 6–12 inches of the surface from October through May. Even the better-drained Scranton ridge soils typically have water tables at 18–30 inches in the wet season. Storm surge from hurricanes — Katrina (2005) raised a 28-foot surge across Biloxi — temporarily floods the entire coastal plain to depths of 10–20 feet, saturating soils for days to weeks and destroying septic system biological communities.

Local Regulations

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.

Frequently Asked Questions — Biloxi

How does hurricane risk affect septic systems in Biloxi?
Hurricane storm surge — which reached 28 feet in Biloxi during Katrina in 2005 — can completely submerge and destroy septic systems. Storm surge floods tanks with salt water and debris, destroys drain field biological communities, and structurally damages or floats plastic tanks. MSDH now requires all new septic tanks in Harrison County's coastal flood zones to be anchored against flotation with concrete deadman anchors and stainless steel strapping. After any major hurricane, MSDH recommends having your system inspected and pumped before resuming use.
Why is septic system placement near the Mississippi Sound strictly regulated?
Mississippi Sound is a major commercial and recreational shellfish harvesting area regulated by the Mississippi Department of Marine Resources. Fecal coliform bacteria from failing or poorly sited septic systems is the primary cause of shellfish harvest area closures. MSDH closely monitors septic systems near the Sound and may require advanced treatment systems with reduced pathogen loading for new installations within 300 feet of the shoreline. A single failing system can trigger a shellfish closure affecting miles of coastline.
What type of septic system is typical on the Biloxi peninsula?
Given the shallow water tables and sandy soils, most new or replacement systems on Biloxi's barrier peninsula use engineered mound systems or pressure distribution systems on clean sand fill. Conventional gravity drain fields are rarely feasible where Myatt-series soils with 6–12 inch water tables dominate. A properly engineered mound system elevated 2–4 feet above natural grade on a Biloxi coastal lot typically costs $8,000–$16,000 depending on lot configuration and distance from access for fill delivery.
How often should I pump my septic tank in Biloxi?
Biloxi's warm, humid subtropical climate means septic tanks decompose waste somewhat faster than in northern states, but the high water use associated with coastal living (irrigation, exterior washing after saltwater exposure) can offset this. MSDH recommends pumping every 3 to 5 years for typical households. After any hurricane event that floods your property, pump the tank immediately before resuming use — storm surge contamination can introduce sediment and debris that accelerates solids accumulation and may damage pump components.
Can I install a septic system on a small lot in Biloxi?
Small lots on the Biloxi peninsula present significant challenges. MSDH requires setbacks of 75 feet from wells, 50 feet from surface water, 10 feet from property lines, and a minimum effective drain field area based on daily design flow. The combination of shallow water tables (requiring mound systems) and small lot sizes in historic Biloxi neighborhoods often makes code-compliant installation on lots under half an acre extremely difficult or impossible without a variance. Contact Harrison County Health Department for a pre-application site review before purchasing a small undeveloped lot on the peninsula.

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