Septic System Setbacks and Spacing Rules in Florida
Where a tank and drainfield can go depends on distance rules to wells, water lines, lakes and the water table. Here are the numbers we can source, in one table.
- Well, water line and lake distances
- Water-table gap
- Trench spacing
- Room for repairs
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The distance rules in one table
| Item | Number | Source |
|---|---|---|
| Private drinking-water well | 75 feet | FDEP summary |
| Water lines | 24 inches, with sleeving or backflow devices as needed | Rule text |
| Trench sidewall to sidewall | 24 inches minimum | FDEP-posted manual |
| Water table below drainfield bottom (standard) | 24 inches in the wettest season | Rule text |
| Surface water (advanced treatment designs) | 25 feet | Rule text |
| Water table below drainfield bottom (advanced treatment) | 12 inches | Rule text |
| Open area meeting setbacks | At least 75 percent of the unobstructed area | Rule text |
Numbers come from rule text and state records. Your site plan shows the exact distances for your lot.
What this means for your yard plans
- Place pools, sheds and additions with the field in mind
- Keep trees with big roots away
- Mark the well before the soil check
- Do not bury new water lines through the field
How we use these numbers
- Walk the lot. We mark wells, lines, ponds and slopes.
- Map the open area. We keep room for repair and expansion.
- Draw the plan. Each distance is checked on the site plan.
- Permit. The package goes to the permitting office. See the permit guide.
Setback questions
How far must a drainfield be from a private well?
The state's records list 75 feet (FDEP summary).
How much space must be between trenches?
At least 24 inches between trench sidewalls (FDEP-posted manual).
How far must water lines be from the system?
At least 24 inches, with sleeving or backflow devices where needed (rule text).
How far from a lake or pond?
For systems built to advanced treatment standards, at least 25 feet from surface water or a wet retention area (rule text).
What is the water table rule?
Can I put a shed or pool near the field?
Keep in mind that at least 75 percent of the unobstructed area must meet setbacks so the field can be repaired later (rule text). Ask before you build.
Have a tight lot?
Send your address and a sketch. Return to the home page.