FL S1664

Defines "onsite sewage treatment and disposal system" and requires the Department of Environmental Protection, Department of Health, local governments, and wastewater utilities to develop remediation plans as part of basin management action plans when necessary to achieve total maximum daily loads.

Directs the department to identify priority focus areas for remediation based on soil conditions, groundwater/surface water travel time, proximity to surface waters, hydrogeology, onsite system density, and nutrient load, with remediation plans to be completed and adopted within 5 years of the effective date.

Requires remediation plans to include options for system repair, upgrade, replacement, drainfield modification, nutrient-reducing features, or connection to central sewerage systems, with priority rankings and implementation schedules with milestones for achieving total maximum daily load targets.

Makes installation, repair, modification, or upgrade of onsite sewage systems on 1-acre-or-less lots within basin management action plans subject to remediation plan requirements.

Requires the department to evaluate the need for wastewater treatment facility creation or improvement and authorizes cost-share agreements with local governments, with funding prioritized for projects eliminating public health hazards, enabling compliance with discharge elimination laws, and implementing total maximum daily loads and water quality improvements.