Why Nitrogen-Reducing Systems Exist
Conventional septic systems separate solids from liquids effectively, but they don't remove nitrogen from the effluent. When thousands of conventional systems concentrate nitrogen into the same aquifer — especially near sensitive springs — the cumulative effect fuels algae growth, chokes native vegetation, and degrades the ecosystems that make Citrus County unique.
Nitrogen-reducing systems treat wastewater more thoroughly, reducing nitrogen by at least 65% before effluent enters the ground. For the full background on regulations, see our BMAP guide for homeowners.
When Is One Required?
You're in a Priority Focus Area and need a major repair or replacement. If the repair requires a permit, the new design must include nitrogen-reducing treatment.
You're building new on a lot under one acre in a PFA. Conventional systems aren't an option.
Your existing system works and you're maintaining it. No upgrade required. The rule only triggers with new permit activity.
Compare Your Options
Two system types cover the vast majority of residential installations in Citrus County. Click each tab to see how they compare:
Aerobic Treatment Unit (ATU)
Uses oxygen-driven biological treatment to break down waste more completely than a conventional tank. Produces cleaner effluent with significantly reduced nitrogen. The most widely installed nitrogen-reducing option in Citrus County.
In-Ground Nitrogen-Reducing Biofilter (INRB)
A passive system that routes effluent through a specially engineered media bed to reduce nitrogen through natural biological processes. No electricity, no moving parts, no aerator to maintain.
Performance-Based Treatment Systems (PBTS) are a third option — engineered to meet the 65% nitrogen-reduction target through various technologies. These are less common in residential settings and typically used when site conditions make ATU or INRB configurations impractical.
A site evaluation and soil test will confirm which options your property can support. In both cases, the system still requires a standard septic tank and routine pumping on schedule.
Research
Advanced Nitrogen Treatment for Septic Systems
University of Florida research explaining how ATU and INRB systems reduce nitrogen, with cross-section diagrams and Florida-specific regulatory context.
Offset the Cost with the County Grant
Homeowners in FDEP-approved Priority Focus Areas may qualify for up to $7,000 in reimbursement toward the installation of a qualifying nitrogen-reducing system. The program runs through March 31, 2027, or until $3.9 million in funding is exhausted.
Learn how to qualify and applyAfter Installation: What to Expect
ATU systems require a maintenance contract — a certified technician inspects on a set schedule, checks the aerator, verifies treatment levels, and confirms performance. This is required by Florida law. Budget for it as an ongoing cost.
INRB systems require periodic inspection but have no mechanical maintenance needs. Long-term care is limited to standard septic pumping and occasional biofilter checks.
Both types still need routine tank pumping on the same 3-5 year schedule as a conventional system. The nitrogen-reducing component treats the effluent — it doesn't replace the need to remove solids.
Communities We Serve
We install and service nitrogen-reducing systems across all of Citrus County, including Crystal River, Inverness, Homosassa, Lecanto, Citrus Springs, Beverly Hills, Floral City, Hernando, Sugarmill Woods, and Pine Ridge.