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Seminole County directs staff to begin pilot septic-to-sewer project amid steep cost estimates
Summary
After a detailed presentation on springs protection and septic remediation costs, the Seminole County Commission instructed staff to proceed with a voluntary pilot septic-to-sewer project using existing DEP grant funding, and asked for homeowner cost analyses, MSBU/special assessment scenarios and O&M implications.
Seminole County commissioners on Dec. 9 heard a technical briefing on septic-to-sewer and advanced on-site septic options and gave staff direction to move forward with a pilot project in a Wekiva priority focus area using existing grant funds.
Utilities Director Johnny Edwards and consultant Dr. Robert Rees told the board that state watershed protections and Basin Management Action Plans (BMAPs) and the 2016 Springs and Aquifer Protection Act create a requirement to remediate septic systems on parcels of one acre or less in certain priority focus areas by 2038. Dr. Rees said the work arises from efforts to reduce nitrogen and phosphorus reaching springs and groundwater.
Edwards presented engineering and cost estimates showing wide ranges depending on approach and location. Converting parcels to central sewer was presented with an approximate per‑tank conversion in some scenarios of about $75,000; engineering bookends for a Wekiva PFA conversion ranged in the presentation from roughly $218 million to $304 million. Advanced on‑site septic systems were shown in a Department of Health cost range of about $20,000–$40,000 per unit. Edwards summarized funding assumptions tied to a $10 million DEP grant with a 50% match and estimated that a roughly $20 million project could remediate about 267 tanks under one scenario.
Commissioners repeatedly emphasized affordability and the need for clear messaging. "Ninety‑nine percent of our residents are not going to write a check" for the highest cost scenarios, Commissioner Zendaya said, asking staff to model homeowner impacts and MSBU/special‑assessment options. Commissioners asked for per‑household monthly and annual cost estimates under different subsidy models and requested details on operation and maintenance obligations for advanced systems.
Kim Orenberg, the county's environmental services director, explained the county's voluntary advanced septic reimbursement program — currently limited in scope to the Wekiva priority focus area — offering up to $10,000 per unit as a reimbursement to homeowners after verified installation.
After wide discussion, the chair summarized board direction: staff should proceed with a first septic‑to‑sewer pilot project in a willing neighborhood using existing grant opportunities; prepare detailed analyses of homeowner costs under MSBU and special assessment scenarios specific to individual parcels; clarify whether homeowner contributions should be returned to the water and sewer fund or applied to expand project scope; and return with technical, financial and O&M details. The chair said staff should continue pursuing grants and report back with options.
The board did not adopt a single funding policy at the meeting; instead it authorized staff to continue with a pilot and come back with the detailed analyses commissioners requested.
Next steps: staff will apply for grants and schedule a dedicated septic‑to‑sewer work session early next year to present scenarios, cost breakdowns and any proposed assessment mechanisms.
(Reporting based on presentation and board discussion at the Seminole County Board meeting, Dec. 9, 2025.)
