Pasco County requires a site development permit for grading/filling per LDC Chapter 900. Drainage cannot be diverted onto neighbors (common-law nuisance plus code violation). Retaining walls over 4 feet require engineered design and a building permit per Florida Building Code.
Pasco County regulates grading and drainage under Land Development Code (LDC) Chapter 900 and the Florida Building Code (FBC) 8th Edition (2023). Site development and grading permits are required for fill or excavation exceeding LDC thresholds (generally 50 cubic yards or any work altering drainage patterns). Lots must be graded to direct runoff away from structures and away from adjoining properties — diverting stormwater onto a neighbor constitutes both a code violation and a common-law private nuisance under Florida tort law. Retaining walls over 4 feet (measured from bottom of footing to top of wall) require engineered plans signed and sealed by a Florida-licensed professional engineer plus a building permit per FBC §1807. Compaction testing (typically 95% modified Proctor) required for structural fill. Final grade must match the approved plan before certificate of occupancy. Karst/sinkhole-prone sites may require geotechnical evaluation before deep fill. SWFWMD ERP may be triggered for projects altering flow.
Unpermitted grading: stop-work order plus fines up to $500/day under F.S. Ch. 162. Diverting drainage to neighbor: civil injunction risk plus code citation ($250+). Retaining wall over 4 ft without permit: stop-work, retroactive permit fees, possible removal order. Fill in wetland: FDEP enforcement.
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