Septic Systems, Septic-to-Sewer and Remodeling in Florida

If your home has a septic tank, a remodel or addition can involve one more office: the one that permits septic systems. Along the Indian River Lagoon, state law is also pushing many homeowners toward nitrogen-reducing systems or sewer connections by 2030, which can change the budget and timing of a bigger project. Here's how it works on Florida's East Coast, with examples from Brevard, Indian River, St. Lucie, Volusia and Flagler counties.

Who regulates septic systems now

The 2020 Clean Waterways Act moved regulation of septic systems (onsite sewage treatment and disposal systems, or OSTDS) from the Department of Health to the Florida Department of Environmental Protection (DEP), effective July 1, 2021. The rules are now in chapter 62-6 of the Florida Administrative Code.

Day to day, little changed for most homeowners. Under an agreement with DEP, county health department staff kept doing permits and inspections. DEP began issuing permits directly in 16 Panhandle counties on January 2, 2025, and in Marion County in July 2025. DEP's permitting FAQ says the remaining counties will move over depending on legislative approval.

So in Brevard, Volusia, Indian River, St. Lucie and Flagler counties, you still apply to the Florida Department of Health office in your county (its environmental health section). Brevard County's lagoon program page, for example, says the Florida Department of Health in Brevard County manages septic permitting. Check DEP's FAQ for the current list, because this is changing.

When a remodel or addition triggers septic review

Rule 62-6.001 says an approved system that's working properly stays valid under the permit it was approved under. But changes that alter the conditions the system was approved under, change the sewage or increase sewage flow need reapproval before the work starts. In practice, these projects commonly trigger a review:

• Adding a bedroom, including turning a den or office into a bedroom. Health departments treat a new bedroom as a likely increase in flow.
• Building over or near the system. An addition, slab or other structure that would cover any part of the tank or drainfield, or sit closer than the required setbacks, needs review.
• Changing how the building is used in a way that increases flow or changes the kind of sewage, such as converting space to a business.

Remodels that don't add a bedroom or touch the system are often simpler. The Florida Department of Health in Brevard County, for example, uses a modification application and doesn't require the existing-system evaluation form for single-family remodels that don't add a bedroom. Other counties handle it differently, so ask before you design.

If reapproval is needed, the health department may require the system to be repaired, upgraded or brought into compliance with current rules. In nitrogen-reducing areas, that can mean an enhanced system. Ask your building department whether it needs septic approval before it will issue the building permit for your addition.

For bathroom and addition permits generally, see bathroom remodel permits and home addition costs.

Nitrogen-reducing septic rules

Where Florida waters fail water quality standards, the state adopts cleanup plans called basin management action plans (BMAPs), and septic rules are now tied closely to them.

BMAP areas statewide

A 2023 law (HB 1379) requires that since July 1, 2023, new septic systems on lots of one acre or less in BMAP and alternative restoration plan areas be enhanced nutrient-reducing (ENR) systems instead of conventional ones. ENR systems include aerobic treatment units and in-ground nitrogen-reducing biofilters. Aerobic treatment units and performance-based systems also need an operating permit from the health department.

The Indian River Lagoon Protection Program

The same law created the Indian River Lagoon Protection Program (section 373.469, Florida Statutes). It covers the Banana River Lagoon, North Indian River Lagoon and Central Indian River Lagoon BMAPs and the Mosquito Lagoon Reasonable Assurance Plan, which together include parts of Volusia, Brevard, Indian River and St. Lucie counties. In that area:

• Since January 1, 2024, new septic systems aren't allowed where central sewer is available. Where it isn't, only ENR systems, or other systems that remove at least 65% of nitrogen, are allowed, on lots of any size.
• By July 1, 2030, properties with existing septic systems must connect to central sewer if it's available, or upgrade to an ENR system or one that removes at least 65% of nitrogen.
• A 2026 law (HB 1417, effective July 1, 2026), as described in the Legislature's bill summary and analysis, limits the 2030 requirement to commercial properties and residential properties of 10 acres or less. It also requires the permitting agency to tell owners who apply to repair, modify or replace a conventional system before July 1, 2030 that the system must be upgraded.

To check your lot, use DEP's mapping tool for BMAP septic requirements, linked from DEP's ENR permitting page, and its BMAP tables.

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Help paying for upgrades and sewer connections

Funding programs open, close and change amounts. Always get written approval before work starts, because work done first may not qualify.

Brevard County: Save Our Indian River Lagoon

Brevard County's Save Our Indian River Lagoon program offers grants of up to $20,000 to replace a conventional septic system with an advanced one, based on each property's estimated nitrogen load. Since a December 2025 county decision, every property within the program's plan area is eligible for at least $6,000. Eligible costs include design, permits, inspections, materials, equipment and contract labor. You must apply and receive a notice to proceed before starting. The county's septic mapper shows the amount for each parcel, and the county has also approved reimbursement for some owners who upgraded earlier. Separate septic-to-sewer projects serve specific neighborhoods; ask your utility whether sewer is available.

Volusia County: DeLeon Springs area

Volusia County runs a Septic Upgrade Incentive Program funded by a DEP grant, but only within the DeLeon Springs priority focus area in West Volusia. The county's forms list rebates of up to $14,000 for an aerobic treatment unit and $8,000 for an in-ground nitrogen-reducing biofilter, paid to participating contractors. Work must be pre-approved by the county and permitted by the health department before it begins. Beachside Volusia isn't covered by this program.

Indian River County

Indian River County scheduled public workshops in 2026 on septic-to-sewer conversion, and local news reports say the county has received a grant and is seeking more state and federal funding to help homeowners connect. We didn't find an official county page with program terms, so ask the county's utilities department or your city utility what's available for your street.

St. Lucie and Flagler counties

We didn't find a countywide homeowner septic grant program in St. Lucie or Flagler County. Parts of St. Lucie County are in the Indian River Lagoon program area, so ask your county or city utility about sewer plans and any assistance.

Practical steps before you remodel on septic

1. Find your system. Locate the tank and drainfield, and ask the health department for permit records on your property.
2. Check your area. Use DEP's map to see whether your lot is in a BMAP or the Indian River Lagoon program area, and ask your utility whether sewer is available or planned.
3. Talk to the health department early. Ask whether your project needs an existing-system evaluation or modification permit, and what would trigger an upgrade.
4. Think about timing. If you'll have to connect or upgrade by 2030 anyway, doing it with your addition may avoid digging up new landscaping or pavers later.
5. Line up funding first. Apply for any grant and wait for approval before signing a contract or starting work.
6. Budget for surprises. Septic work can uncover problems; see renovation contingency.

For permits on the building side, see building permits in Florida and the local guides for Brevard County, Indian River County and Volusia County.