Marion County Septic Permit Guide (OSTDS)

Who administers septic permits in Marion County

In Florida, an onsite sewage treatment and disposal system, or OSTDS, is what most people call a septic system. For years these systems were permitted by the Florida Department of Health through county health departments. That changed. Under the 2020 Clean Waterways Act, the OSTDS program is moving to the Florida Department of Environmental Protection (FDEP) in phases, and Marion County transitioned to FDEP on July 1, 2025.

In practice, that means new permits, site evaluations, and inspections for Marion County are now handled by FDEP, largely through its online OSTDS portal. The governing statute is Section 381.0065, Florida Statutes, and the technical standards live in Chapter 62-6 of the Florida Administrative Code, the rule chapter that replaced the former Chapter 64E-6 used under the health department.

Most of Florida has not made that move yet, which is why the answer differs by county and why some state pages still route Marion County owners to the health department. Our county-by-county table of Florida septic permit authority lists all 67 counties, the agency for each, and the date it changed.

The permit process, step by step

A new system and a full drainfield replacement follow the same general path. A licensed contractor usually manages it for you, though the property owner is the legal permit holder.

1. Application. The contractor submits the construction permit application and fee, typically through the FDEP OSTDS portal.
2. Site evaluation. An evaluator examines the soil and site conditions, including soil borings to read the soil profile and estimate the seasonal high water table.
3. Soil and loading assessment. The soil texture and water table determine the soil loading rate and which system types the lot can support.
4. System design. The system is designed for the home size and the site conditions, including the drainfield size and any advanced treatment the location requires.
5. Construction permit. FDEP reviews the application against the site evaluation and, if it approves, issues the construction permit.
6. Construction. The contractor installs the permitted system.
7. Final inspection and approval. An inspection confirms the tank, drainfield, setbacks, and grading before the system is approved for use.

For a standard home, expect roughly four to twelve weeks from application to approval, depending on the site, the system, and scheduling.

What needs a permit, and what does not

Section 381.0065, Florida Statutes, is direct about it: a person may not construct, repair, modify, abandon, or operate an onsite sewage system without first obtaining a permit. In practice, for a Marion County homeowner:

• New system, replacement, or drainfield replacement: construction permit required.
• Repairs and modifications: a repair permit is required, and it is valid for 90 days after issuance.
• Abandoning a system: also permitted work under the same sentence, and the one people most often miss. Ask before an old tank is taken out of service.
• Routine pumping: the statute does not put a construction or repair permit on the homeowner to have a tank emptied. That is not the same as unregulated, since the company doing the work and the disposal of what it removes are regulated by the state. Use a properly registered company, and let your contractor confirm what your specific job needs rather than relying on this page.

Two more statutory details worth knowing before you schedule anything. A construction permit is valid for 18 months from issuance, extendable once by 90 days, so the permit is not the step to rush ahead of financing. And a homeowner may legally do construction, maintenance, or repair work on a system serving their own owner-occupied single-family home without being a registered contractor, but the permitting requirements still apply in full, so owner-built does not mean permit-free.

New construction has one more gate: a Florida municipality or county may not issue the building or plumbing permit for a home that needs a septic system until the system's construction permit exists. If you are building in rural Marion County, the septic permit comes first, not last.

Site evaluation and soil testing

The site evaluation is the part homeowners most often underestimate, and it is where Marion County geology matters. The evaluator reads the soil profile to find the soil texture and the estimated seasonal high water table. Florida rules require unsaturated soil between the bottom of the drainfield and that water table, so a high seasonal water table can push a site toward a mound or other engineered system. Sandy, well-drained soils, which are common on the Ocala karst uplands, are generally easier and cheaper to work with than wet or restrictive soils.

Drainfield sizing basics

Drainfield sizing in Florida is governed by Rule 62-6.008, Florida Administrative Code. A few principles drive it:

• System size is based on estimated sewage flow, with a minimum baseline used for small homes.
• Estimated flow increases with each additional bedroom or each additional increment of building area.
• There is a minimum drainfield area, with additional area added for each bedroom beyond two.
• The soil loading rate, set by the soil texture, converts that flow into the required drainfield area.
• Where the soil profile changes, sizing is based on the most restrictive soil found within a set depth below the drainfield.
• New systems also require a minimum septic tank capacity that grows with the number of bedrooms.

The exact per-bedroom flow figures and loading-rate tables are in Rule 62-6.008. Your contractor applies them to your specific soil results, which is why two lots on the same street can need different drainfields.

Setbacks

Rule 62-6.005, Florida Administrative Code, sets minimum separation distances. These shape where a system can go, especially on smaller or waterfront lots:

• 75 feet from a private potable well.
• 100 feet from a public potable well serving up to 2,000 gallons per day, and 200 feet from larger public wells.
• 75 feet from surface water, such as a lake, river, or wetland.
• 5 feet from property lines.
• 5 feet from building foundations.
• 10 feet from potable water lines (with exceptions for sleeved or stronger pipe).
• 15 feet from certain drainage swales and dry retention areas.

On riverfront lots near Rainbow Springs in Dunnellon or lakefront lots on Lake Weir in Ocklawaha, the surface-water setback can be the single biggest constraint on where a drainfield fits.

Permit fees

Florida law sets fee ranges in Section 381.0066, Florida Statutes. The statute provides for roughly:

• $25 to $125 for application review, permit issuance, or a system inspection.
• $40 to $115 for a site evaluation.
• $150 to $300 for an annual operating permit on an engineer-designed performance-based system.

Permit and site-evaluation fees are only a small part of the total. For how they fit alongside the contractor cost, soil testing, and any advanced-system premium, see our drainfield replacement cost guide for Ocala and Marion County.

When advanced treatment is required

Much of Marion County sits in spring-protection zones. Silver Springs and Rainbow Springs are now covered by one combined Basin Management Action Plan (BMAP), and its onsite sewage requirements run across the whole BMAP area on any lot size rather than only inside a Priority Focus Area. Where central sewer is unavailable, a new system must be a DEP-approved enhanced nutrient-reducing (ENR) system achieving at least 65 percent nitrogen reduction, or another wastewater system achieving at least 65 percent. An existing system must be upgraded to the same standard when you need a construction permit to repair, modify, or replace it. Separately from what the BMAP requires, Florida defines an ENR system as one approved to cut total nitrogen by at least 50 percent before the drainfield, or at least 65 percent across the tank and drainfield combined. This is the single biggest factor that can change the cost and design of a system here. Our springs and BMAP guide explains where these rules apply and what they mean.

How this connects to your project

Whether you are hiring septic tank installers for a new system, a drainfield replacement, or septic for new construction, the permit and the site evaluation come first. Marion County Septic is a free referral service. Tell us about your property and we connect you with a licensed local contractor who handles the FDEP permit, the soil evaluation, and the installation, then provides a free quote.