Spring Hill is an unincorporated CDP in Hernando County, so stormwater management is run by Hernando County Stormwater Management (Public Works, 1525 E. Jefferson St., Brooksville, FL 34601). Hernando County operates under FDEP's NPDES Phase II MS4 Generic Permit — initial permit coverage became effective in June 2003 after FDEP approval, and the permit was renewed effective December 1, 2012 for a five-year term and has rolled forward in five-year cycles since. The county Stormwater section implements the six federal Minimum Control Measures, prohibits illicit discharges into the MS4, maintains the public drainage system, and reviews development plans. Construction sites disturbing one acre or more must file a Notice of Intent (NOI) with FDEP under the statewide Generic Construction Permit and keep an SWPPP on site. Permanent post-construction stormwater treatment is permitted by the Southwest Florida Water Management District (SWFWMD) under FAC 62-330.
Hernando County's stormwater framework operates at the intersection of federal Clean Water Act §402(p) authority, FDEP's statewide NPDES delegation (FS 403.0885), and the county's Code of Ordinances. As a Phase II regulated small MS4, Hernando County operates under FDEP's Generic Permit for Stormwater Discharge from Phase II MS4s — FDEP approved Hernando County's initial NOI in June 2003, renewed coverage effective December 1, 2012 for a five-year term, and the county has continued renewal on five-year cycles. The county's Stormwater Management Program addresses the six Minimum Control Measures: public education and outreach, public involvement and participation, illicit discharge detection and elimination (IDDE), construction site runoff control, post-construction stormwater management, and pollution prevention/good housekeeping. The IDDE program prohibits non-stormwater discharges into the county MS4 (canals, ditches, swales, inlets, outfalls) — including soap, paint, motor oil, concrete washout, sediment, sewage, chlorinated pool water, and chemical washwater. Spring Hill drainage generally flows west toward the Mud River / Weeki Wachee Springs system and the Gulf of Mexico, and east/north into the Withlacoochee River watershed; both systems are within SWFWMD jurisdiction (NOT St. Johns River WMD). Construction sites of one acre or more — including sites that are part of a larger common plan of development — must file an NOI with FDEP under the Generic Construction Permit before ground disturbance, maintain a written Stormwater Pollution Prevention Plan (SWPPP) on site, and install perimeter BMPs (silt fence, vehicle tracking control pads, inlet protection, concrete washout). Permanent post-construction stormwater treatment is reviewed by SWFWMD under the statewide Environmental Resource Permit (ERP) program (FAC 62-330). Hernando County also requires a minimum six (6) inches of freeboard between the design high water elevation and the lowest provided berm elevation surrounding detention/retention structures. Contact: Hernando County Stormwater Management, Public Works, 1525 E. Jefferson St., Brooksville, FL 34601, (352) 754-4060.
Illicit discharges and stormwater violations are enforceable as Hernando County Code violations and as state violations under FS Ch. 403. Code Enforcement issues notices of violation; unresolved cases go to the county Special Magistrate who can assess fines up to $500 per day for repeat violations under FS 162.09, plus restoration costs and abatement liens. State FDEP enforcement under FS 403.121 reaches up to $10,000 per day in administrative penalties with criminal exposure under FS 403.161 for willful or knowing discharges. Construction sites of one acre or more operating without an active NOI under the Generic Construction Permit face FDEP enforcement plus county Stop Work orders; the county will not issue a Certificate of Occupancy until permanent stormwater facilities are constructed and accepted.
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