How Much Does Septic System Installation Cost in Florida?
National cost guides put a typical septic system installation at about $3,000 to $12,000. Their averages run from $6,000 to about $8,000. A Florida lot can land above that range. A high water table can call for a mound system, and some areas now require a nitrogen-reducing system.
The same guides price mound and aerobic systems at $10,000 to $20,000. These are market numbers, not our price list. If you are planning septic system installation, the sections below show what moves your number.
What goes into the price of a new septic system?
Ranges come from three national cost guides. The last three rows are fees posted by Broward County’s health department.
| Cost item | Range or fee | Source |
|---|---|---|
| Conventional system, installed | $3,000 to $10,000 | National cost guides |
| Mound system, installed | $10,000 to $20,000 | National cost guides |
| Aerobic treatment unit system, installed | $10,000 to $20,000 | National cost guides |
| Drain field | $2,000 to $12,000 | National cost guides |
| Tank alone, 1,000 gallons | $900 to $1,500 | A national cost guide |
| Soil testing | $700 to $2,000 | National cost guides |
| Permits | $450 to $2,300 | National cost guides |
| Land survey | $330 to $900 | A national cost guide |
| Land clearing | $1,200 to $4,800 | A national cost guide |
| Plan review fee | $100 | Broward County health department |
| Permit fee, two inspections included | $260 | Broward County health department |
| Site evaluation by health department staff | $165 | Broward County health department |
The rows overlap, so do not add them all up. An installed system price already covers its own tank and drain field. One national guide notes that complex systems can run past $23,000.
Why does the water table matter so much in Florida?
In the wettest season, Florida’s rule wants the water table at least 24 inches below the drain field’s bottom. The rule also calls for at least 42 inches of suitable soil under it. Both lines come from Rule 62-6.006 of the Florida Administrative Code.
The University of Florida’s extension service explains why. Those 24 inches let wastewater filter through soil that is not soaked, where treatment is strongest.
When the wet-season water table sits too close to the surface, a standard in-ground drain field cannot meet that rule. One answer is to raise the drain field on fill. Florida’s rule then judges the system at the final lot elevation. Filling the site may need its own permits from other government offices.
Florida’s rule calls a drain field built up in fill above the native soil a mound system. National guides rank mound systems among the costlier types.
The site evaluation estimates the seasonal high water table. Broward County’s checklist calls for two soil profiles down to 72 inches, with water table signs noted in each.
How do permits and the site evaluation add to the cost?
Florida law requires a permit before a septic system is built or repaired. On July 1, 2021, the Florida Department of Environmental Protection took over the state septic program. County health department offices still issue the permits and do the inspections.
A new system application has four parts: the form, a site plan, the home’s floor plan and a site evaluation. The site evaluation looks at the soil and the lay of the land. Your county health department sets the total permit fee based on the system type.
Broward County posts its fees. Plan review costs $100, and the permit costs $260 with two inspections included. Health department staff charge $165 to do the site evaluation, or an approved private evaluator can do it. The checklist also asks for a sealed property survey.
In Palm Beach County, the health department must approve septic plans before a building permit can be issued. A Florida construction permit stays valid for 18 months, with one 90-day extension possible. Fees change, so ask your county health department office for its current numbers.
Will your lot need a nitrogen-reducing septic system?
A 2023 state law, House Bill 1379, changed what many new systems must be. From July 1, 2023, new systems on lots of one acre or less in impacted areas must reduce nitrogen. That applies where sewer is not available. Impacted areas take in every basin management action plan area and alternative restoration plan area.
The state lists only ten Florida counties with no impacted areas at all. Palm Beach, Broward, Martin and St. Lucie Counties are not on that list. The Florida Department of Environmental Protection keeps an online map of these areas. Going by that map, small lots in Port St. Lucie and Stuart may need a nitrogen-reducing system.
Parts of St. Lucie County also sit in the Indian River Lagoon Protection Program area. There, from January 1, 2024, the rule covers lots of every size. For any single lot, the county health department makes the call.
Three kinds of systems meet the state’s standard:
- in-ground nitrogen-reducing biofilters
- aerobic treatment units on the state’s approved list
- performance-based treatment systems on the state’s approved list
National cost guides price aerobic systems at $10,000 to $20,000. Florida law requires an operating permit before an aerobic unit is used. The rule also makes a maintenance contract a condition of approval. The first contract runs at least two years, with inspections at least twice a year.
How does the size of your home change the price?
Florida sizes a septic system by bedrooms and by building area, and the larger result wins. A three-bedroom home of up to 2,250 square feet is rated at 300 gallons a day. That calls for a tank of at least 900 gallons, the smallest size on the state’s table.
A four-bedroom home of up to 3,300 square feet is rated at 400 gallons a day. That calls for at least 1,050 gallons. Each extra bedroom, or each extra 750 square feet, adds 60 gallons a day.
The drain field grows with the flow too. The rule also sizes it by soil type, so slower-draining soil needs a larger one. A bigger tank and a bigger drain field both add cost.
What site work can push the price up?
National cost guides price the site work too. Land clearing runs $1,200 to $4,800, and excavation runs $1,500 to $6,000. St. Lucie County’s health department tells applicants to clear the lot before submitting the septic application.
Replacing an old system adds steps of its own. Florida law requires a permit to abandon an old system, too. If your current system might be saved, look at septic tank repair before you price a full replacement.
How do you get a real price for your lot?
Every figure above comes from published cost guides or a county fee sheet. Your price depends on what the site evaluation finds and what the permit calls for. Jojo Septic handles septic system installation across Palm Beach, Broward, Martin and St. Lucie Counties.
See our septic system installation page for what the job covers. We look at the job and put the quote in writing. Call or text (561) 239-5838.
Once the new system is in, plan on regular septic tank pumping. Our guide to what septic tank pumping costs in Florida covers that number.