Do I need a nitrogen-reducing (ENR) septic system in Citrus or Hernando County?

Everything below unpacks that answer: which towns lean inside and outside the PFAs, how to check your actual parcel in five minutes, and what the system costs now that both county incentive programs have run out of money. No fear, no countdown clocks; a BMAP-triggered upgrade is a planning problem, and planning problems reward accurate maps.

The two-question test

Question 1: is your parcel inside a PFA?

Three spring systems carry Basin Management Action Plans here, each with a mapped Priority Focus Area: Crystal River / Kings Bay and Homosassa / Chassahowitzka in Citrus County, and Weeki Wachee in Hernando County (Florida DEP, Springs Protection and BMAPs). The zones radiate from the spring vents on the coastal west; they do not blanket either county.

Question 2: does your project file a covered permit?

Covered: repairs, modifications (a drainfield replacement is the classic modification), and new construction inside a PFA. Not covered: pumping and maintenance, projects outside every PFA, and permit applications that were already filed before 2025-12-15. One waiver exists: no ENR is required where central sewer will be available for connection within five years, per section 373.807, Florida Statutes, which matters most near Spring Hill's active septic-to-sewer project areas.

Town by town: inside-leaning and outside-leaning

The table below is a likelihood map, not a verdict. PFA membership is decided parcel by parcel, and every row ends the same way: check your address.

Community	County	Springshed	Likely PFA status
Crystal River	Citrus	Kings Bay	Inside-leaning
Homosassa	Citrus	Homosassa / Chassahowitzka	Inside-leaning
Spring Hill	Hernando	Weeki Wachee	Inside-leaning for much of the community
Weeki Wachee (addresses)	Hernando	Weeki Wachee	Mixed; mailing addresses reach beyond the zone
Inverness	Citrus	Withlacoochee / Tsala Apopka basin	Outside-leaning
Floral City	Citrus	Withlacoochee basin	Outside-leaning
Beverly Hills	Citrus	Eastern uplands	Outside-leaning
Citrus Springs	Citrus	Northern uplands	Outside-leaning
Brooksville	Hernando	Brooksville Ridge	Outside-leaning

Basis: PFA boundaries per the Florida DEP BMAP mapping and the DOH-Citrus (2025-10-09) and DOH-Hernando (2025-10-10) notices; drainage context per Florida DEP springs documents. Parcel-level verification required in every case.

How to check your parcel in five minutes

1. Look up your parcel on the Florida DEP's Priority Focus Area mapping, reachable from the DEP springs pages (floridadep.gov/springs). Search by address, then confirm the parcel outline, not just the pin.
2. Confirm with the county permitting office, which applies the rule: DOH-Citrus Environmental Public Health, (352) 513-6100, or DOH-Hernando Environmental Health, (352) 540-6800. Have your parcel number ready.
3. If you are in a sewer-expansion corridor, ask the county the five-year availability question at the same time; the waiver can change the whole project.

The dedicated PFA self-check guide expands each step with what to say and what to write down.

What qualifies as an ENR system

The standard is performance: a system approved for at least 65 percent total nitrogen reduction, or at least 50 percent before the drainfield, defined in section 381.0065, Florida Statutes. Three families qualify per Florida DEP guidance: in-ground nitrogen-reducing biofilters (INRBs), aerobic treatment units certified to NSF/ANSI 245, and approved nitrogen-reducing performance-based treatment systems. The ENR upgrade page compares them and explains how the county permit path handles each.

What it costs at full price, honestly

Both county subsidy programs are exhausted, so current budgets stand at full price. The bands below are labeled estimates triangulated from published Florida cost data; your parcel's soil, water table, and system choice set the real number, in a written itemized quote.

Project	Reported band (estimate)
Conventional new install	roughly $5,000 to $12,000
Conventional drainfield replacement	roughly $3,000 to $15,000
Engineered / mounded field (karst, high water table)	roughly $15,000 to $20,000+
ENR / aerobic system in a BMAP springs zone	roughly $15,000 to $35,000+
The ENR premium over conventional	roughly $8,000 to $20,000
ENR maintenance contract, annual	roughly $150 to $600+ (published figures vary widely)

The subsidy record, past tense and per county: the Citrus County Septic Upgrade Incentive Program reimbursed up to $7,000 and is closed to new applicants, funding exhausted, as of 2026-07-18 (county program page); the Hernando County SUIP offered up to $7,500 inside the Weeki Wachee PFA, opened 2026-03-11, capped at 132 systems, and is reported funding-expended as of 2026-07-18 (county SUIP page). No federal tax credit applies to residential septic work, per IRS residential-energy guidance. Full line-item detail: ENR septic system cost in Florida.

Three things this rule is not

• Not a point-of-sale law. Florida bars a governmental point-of-sale septic evaluation mandate (FS 381.00651). Home sales proceed without a state-required inspection; buyers order due-diligence inspections because they are prudent, not because they are compelled.
• Not retroactive. A working conventional system inside a PFA is not ordered replaced. The rule attaches when you file a covered permit.
• Not county-wide. The whole point of the parcel check: much of eastern Citrus and the Brooksville Ridge sits outside every PFA, where replacements permit conventionally.

Where to go from here

If your parcel checks inside and a project is coming, read the full mandate guide for the permit mechanics, then get a real number from a real contractor: we match you free with an independent state-registered septic tank contractor working your county, and the quote comes back itemized against your actual soil evaluation.