FEMA flood zone rules in Collin County, TX — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Collin County participates in NFIP with floodplain management ordinances. Lake Lavon and Lake Ray Hubbard drive FEMA Zone AE and shaded X designations. New construction in SFHA must elevate 1-2 ft above BFE.
FEMA DFIRM panels (effective June 2, 2009 with amendments) map Collin County floodplains primarily along Lake Lavon, Lake Ray Hubbard, East Fork Trinity River, Sister Grove Creek, and Wilson Creek. Collin County Engineering enforces a 1-foot freeboard above the Base Flood Elevation for new residential construction in Zone AE, and cities like Plano and Frisco require 2-foot freeboard. Lake Lavon is managed by the USACE Fort Worth District; shoreline structures need USACE Section 404 permits. Substantial improvement rule (50%+ of value) triggers full NFIP compliance. Collin County is NFIP CRS Class 7 in most jurisdictions, earning 15% flood insurance discounts.
Building in SFHA without elevation certificate: city fine $500-2,000, FEMA loss of CRS status. Substantial damage noncompliance: loss of flood insurance. USACE 404 violation: federal penalty up to $50,000 per day.
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See how Collin County's flood zones rules stack up against other locations.
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