Florida · F.A.C. 62-6.008
Septic system requirements in Florida
Tank sizes, drainfield rules, setbacks, permits, and real costs — pulled from Florida's own code rather than a national average.
- 3-bedroom tank
- 1,000 gal
- Design flow
- 100 gpd/BR
- Typical install
- $7,000–$20,000
- Permit fee
- $300–$1,100
- Well setback
- 75 ft
- Permitted by
- State + local
Septic tank sizes required in Florida
Florida sizes systems on a design flow of 100 gallons per day per bedroom, with every dwelling rated for at least 2 bedrooms. The tank must meet both the bedroom table below and a 2× daily-flow detention requirement — whichever produces the larger number governs.
| Bedrooms | Design flow | Code minimum | Recommended |
|---|---|---|---|
| 1 bedroom | 200 gpd | 900 gal | 1,000 gal |
| 2 bedrooms | 200 gpd | 900 gal | 1,000 gal |
| 3 bedrooms | 300 gpd | 900 gal | 1,000 gal |
| 4 bedrooms | 400 gpd | 1,050 gal | 1,250 gal |
| 5 bedrooms | 500 gpd | 1,200 gal | 1,250 gal |
| 6 bedrooms | 600 gpd | 1,350 gal | 1,500 gal |
Source: F.A.C. 62-6.008. The recommended column rounds the governing requirement up to a tank size manufacturers actually stock.Run your own numbers →
Drainfield size and cost by soil type
For a three-bedroom home in Florida at 300 gpd. This single table explains most of the variation between quotes — the area scales inversely with how fast your soil accepts water, and the drainfield is the largest line item in the job.
| Soil | Loading rate | Absorption area | With reserve | Typical total install |
|---|---|---|---|---|
| Medium sand | 0.8 gpd/ft² | 375 ft² | 750 ft² | $9,200 |
| Sandy loam | 0.5 gpd/ft² | 600 ft² | 1,200 ft² | $11,100 |
| Loam | 0.4 gpd/ft² | 750 ft² | 1,500 ft² | $12,300 |
| Silt loam | 0.3 gpd/ft² | 1,000 ft² | 2,000 ft² | $14,400 |
| Clay loam | 0.2 gpd/ft² | 1,500 ft² | 3,000 ft² | $18,500 |
Estimates use Florida's cost index of 0.92× the national average. Build a line-item estimate →
Permits and who issues them
DEP took over the program from the Department of Health, and since January 2025 DEP directly permits 16 panhandle counties. County health departments still handle the rest.
| Permit required | Yes |
|---|---|
| Typical fee | $300 – $1,100 |
| Soil evaluation | Required before permit |
| Licensed installer | Required |
| Turnaround | 2–6 weeks |
| Ongoing inspection | Required operating permits for ATUs and performance-based systems |
| Reserve area | 100% replacement area required |
Minimum setback distances
Measured horizontally from the drainfield unless noted. Local rules are frequently stricter, and on a small lot these numbers — not the soil — often decide the layout.
| Private water well | 75 ft |
|---|---|
| Property line | 5 ft |
| Surface water | 75 ft |
| Building foundation | 5 ft |
Regulatory contact
Florida Department of Environmental Protection — Onsite Sewage Program
floridadep.gov · 850-245-4570
Also: Florida Department of Health — county health departments
What makes septic hard in Florida
The water table is the defining constraint. Across most of the peninsula the wet-season high water table sits within a few feet of the surface, which is why filled and mounded systems are so common.
Nitrogen loading into springs and the Indian River Lagoon has driven Basin Management Action Plans that require enhanced nutrient-reducing systems in designated areas.
Karst limestone in north-central Florida creates direct pathways to the aquifer and triggers stricter siting.
Coastal salt intrusion and storm surge repeatedly damage systems near the shore.
Things that catch people out
- Florida sizes on building area as well as bedrooms. A three-bedroom house over 2,250 ft² is rated as larger than three bedrooms.
- The design flow floor is 200 gpd — a one-bedroom cottage is still sized as if it produced 200 gpd.
- The rules moved from Chapter 64E-6 to Chapter 62-6. Old contractor paperwork citing 64E-6 is out of date.
Florida septic questions
What size septic tank do I need in Florida?
A three-bedroom home in Florida requires a minimum 900 gallon tank under F.A.C. 62-6.008. Design flow is 100 gallons per day per bedroom, and the tank must also hold 2 times daily flow, so the practical recommendation is 1,000 gallons.
Do I need a permit for a septic system in Florida?
Yes. DEP took over the program from the Department of Health, and since January 2025 DEP directly permits 16 panhandle counties. County health departments still handle the rest. Fees typically run $300 to $1,100, with a turnaround of about 2–6 weeks. A soil evaluation or percolation test is required before a permit is issued.
How much does a septic system cost in Florida?
A conventional system for a three-bedroom home typically runs $7,000 to $20,000 installed. Soil quality moves this more than anything else — on tight clay requiring a mound, budget two to three times the low end.
How far must a Florida drainfield be from a well?
75 feet from a private water well. Local rules can be stricter.
Sources
Every figure on this page traces to one of these documents.
- F.A.C. 62-6.008 — System Size Determinations · verified 2026-09-18
- F.A.C. Chapter 62-6 — Standards for Onsite Sewage Treatment and Disposal Systems · verified 2026-09-18