When an ENR system is required
Since July 1, 2023, Florida prohibits new conventional septic systems on lots of one acre or less where central sewer is available. Inside the Weeki Wachee Basin Management Action Plan (BMAP) area, new systems without sewer generally must be enhanced nutrient-reducing (ENR), achieving at least 65% nitrogen reduction:
- On any lot size inside the Priority Focus Area
- On lots of one acre or less elsewhere in the BMAP
Existing systems inside the Priority Focus Area may also need nitrogen treatment when a repair, modification or replacement permit is required. Your septic company and the Florida Department of Health in Hernando County can confirm what applies to your parcel.
Types of ENR systems
In-ground biofilters
Nitrogen-reducing layers built into the drainfield.
Aerobic treatment units
NSF/ANSI 245 units that treat wastewater before the drainfield.
Performance-based systems
Other approved designs that meet the nitrogen standard.
Aerobic units need an operating permit and a maintenance contract, so ask about ongoing costs, not just installation.
Help paying for it
Hernando County and the state have run septic upgrade incentive and septic-to-sewer funding programs. Terms change, so check the county's current program pages before you sign a contract.
Frequently asked questions
How do I know if my lot is in the Priority Focus Area?
Check your parcel on the Florida DEP springs BMAP map and confirm with the Florida Department of Health in Hernando County at (352) 540-6812.
What does an ENR system cost?
Published estimates run about $15,000 to $35,000 or more installed, plus annual maintenance for some system types. These are estimates, not quotes.