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Last reviewed 2026-10-17

Florida Drain Field Replacement Guide

Florida DOH says septic systems serve 30% of Florida's population, and every drain field replacement needs a permit from the county health department. Two state rules drive the price: Rule 62-6.006, F.A.C. requires 24 inches between the bottom of a new drain field and the wet-season water table, and DEP's springs basin plans can require a nitrogen-reducing system instead of a plain replacement.

This guide covers the statewide rules, then links to our county pages, which list each county's fees, soils, rainfall and road corridors.

The same failure can lead to very different jobs. On a deep sandy ridge outside any springs plan, a failed field is often rebuilt in place as a standard trench. On a low lot with a high summer water table, the new field has to be raised with fill to meet the separation rule. Inside a springs focus area, the county permit calls for an enhanced system that removes nitrogen, with an operating permit and a maintenance contract after it is installed. Ask the county health department which case your lot is before you collect quotes, because each case changes what a complete bid has to include.

Permits

DEP has run the onsite sewage (OSTDS) program since July 1, 2021 under Chapter 62-6, F.A.C., and DEP's permitting FAQ lists Lake and Hernando among the counties where the county health department still issues the permits.

Florida Statutes § 381.0066 sets the fee limits: $25 to $125 for application review, permitting or inspection, including repairs; $40 to $115 for a site evaluation; and up to $100 for a biennial ATU operating permit. Lake County's FY2026 schedule lists a $50 repair fee.

Step 1: check DEP's BMAP maps for a springs priority focus area. Step 2: submit the application and site plan to the county health department. Step 3: a site evaluation finds the wet-season water table. Step 4: the county issues the permit with the field size and elevation. Step 5: the system is installed and inspected; since July 1, 2022 a private provider may do the inspection, per DOH-Hernando.

Local conditions

Sand is the norm, and it cuts both ways. NRCS data for Lake County show seepage limits on 391,283 acres, where sand filters effluent too little, and a water table within 30 cm on 262,493 acres.

Springs: DEP's Weeki Wachee plan covers a 90,415-acre priority focus area in Hernando County with about 37,239 known and likely septic systems; replacements there need at least 65% nitrogen removal or a sewer connection.

NOAA's 1991–2020 normals put Lisbon (Lake County) at 50.03 inches of rain a year and Brooksville at 51.94 inches, most of it in the summer wet season when water tables peak.

What drives local prices

  • Water table: HomeGuide's published range is $2,000 to $6,000 for a conventional field and $10,000 to $20,000 for a mound.
  • Springs plans: an enhanced system is closer to HomeAdvisor's $10,000 to $20,000 published range for a full aerobic (ATU) system.
  • State and county fees: § 381.0066 caps a repair permit action at $125, and Lake County's schedule lists $50.
  • Operating permits and maintenance contracts for ATUs and performance-based systems.

Common jobs

  • Mound and filled systems for the 24-inch separation
  • Enhanced nitrogen-reducing systems in springs focus areas
  • Repairs and replacements on sandy ridge lots
  • Sewer connections with tank abandonment

Service area

Our Florida county pages cover Lake County (Clermont, Leesburg, Eustis) and Hernando County (Spring Hill, Brooksville, Weeki Wachee).

Permits come from the Florida Department of Health county offices (DOH-Lake and DOH-Hernando) under the DEP program; the county health department is the office to call.

Communities: Clermont, Leesburg, Eustis, Tavares, Spring Hill, Brooksville, Weeki Wachee, Mount Dora

If it is an emergency

If sewage is surfacing or backing up, keep people and pets away and call your county health department's environmental health office before any repair.

Questions about Florida

Who issues septic permits in Florida now?

DEP runs the program, but its permitting FAQ lists most counties, including Lake and Hernando, as places where the county health department still issues permits.

What is the 24-inch rule?

Rule 62-6.006, F.A.C. requires the bottom of a new drain field to sit at least 24 inches above the wet-season water table.

Will I have to install a nitrogen-reducing system?

Inside a springs priority focus area, often yes. The DEP Weeki Wachee plan requires at least 65% nitrogen removal on replacements unless sewer is available.

Can a contractor start work before the permit?

No. The county health department issues the permit first, then inspects the installed system before it is covered.

How much are state permit fees?

Florida Statutes § 381.0066 limits a repair permit action to $25 to $125 and a site evaluation to $40 to $115; each county sets its amount within those limits.

Sources

County pages in Florida

Fees and rules change; confirm with the permitting office named above. Compare system prices in the drain field replacement cost guide, or run the estimator for your home.

Other locations we cover

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