Wylie, TX Environmental Rules: Flood Zones (2026)

The City of Wylie adopted its current Flood Damage Prevention ordinance under Ordinance No. 2024-43 on December 10, 2024, replacing the prior article. Section 50-79 adopts by reference the FEMA Flood Insurance Study for the City of Wylie and its incorporated areas, effective November 21, 2024, along with the flood insurance rate maps (FIRM) and flood boundary-floodway maps (FBFM) of the same date; those maps are the legal basis for every Special Flood Hazard Area boundary in the city. Section 50-80 requires a floodplain development permit before any development proceeds within an area the maps identify as flood hazard, and the application is posted on the city's website under the Engineering tab.

The city engineer, or the city manager's designated representative, holds the title of floodplain administrator under section 50-106 and reviews every application, checks it against the FIRM, confirms other federal, state or local permits (including Clean Water Act Section 404 permits) have been obtained, and can require additional engineering data when the maps and field conditions disagree. Under section 50-108, an approved permit lapses automatically one year after issuance if construction has not started. Anyone denied a permit, or cited for a violation, can seek a variance or appeal to the city's board of adjustment and appeals under section 50-109; variances require a showing of exceptional hardship and cannot be granted if they would raise flood levels inside a mapped floodway. Section 50-136 makes clear that no structure or land may be constructed, located, extended, converted or altered without full compliance with the article.