Harrison County requires silt fencing and erosion BMPs on all land-disturbing activities over 0.5 acre. MDEQ Small Construction permits apply at 1 acre. Coastal sediment reaching the Gulf triggers federal Clean Water Act violations.
Erosion and sediment control is mandatory for all land-disturbing activities in Harrison County, with enhanced standards for sites draining toward the Mississippi Sound, Back Bay of Biloxi, or Bayou Bernard. Silt fencing, straw wattles, inlet protection, and stabilized construction entrances are required BMPs under MDEQ's Large Construction General Permit (1+ acre) and voluntary best practices for smaller sites. Disturbed areas must be temporarily stabilized within 14 days of inactivity. Gulf Coast sandy soils erode rapidly, and hurricane-season earthwork faces additional scrutiny. Sediment reaching tidal waters can trigger simultaneous MDEQ and EPA Clean Water Act §404 violations. Gulfport and Biloxi inspectors conduct site visits during active grading phases. Contractors working near coastal wetlands face DMR jurisdictional review under §49-27.
No silt fence on active site: stop-work + $250-$2,500 MDEQ. Sediment to Gulf/Sound waters: CWA violation $1,000-$56,460/day per 2024 EPA schedule. Failure to stabilize within 14 days: daily fines until cured. Hurricane-prep non-compliance: emergency enforcement.
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See how Biloxi's erosion control rules stack up against other locations.
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