Leander, TX Environmental Rules: Flood Zones (2026)

007 adopts by reference FEMA's flood insurance rate maps and flood boundary-floodway maps from "The Flood Insurance Study for Travis County, Texas and Incorporated Areas" and "The Flood Insurance Study for Williamson County, Texas and Incorporated Areas," both dated September 26, 2008, reflecting that Leander straddles both counties. 009 backs that up by barring any structure or land from being located, altered, or having its use changed without full compliance. 042 that include maintaining public inspection records, reviewing every permit application, coordinating with the Texas Water Development Board before any watercourse relocation, and obtaining federal Clean Water Act § 404 permit confirmation where needed.

043 must show the lowest-floor elevation of new or substantially improved structures, and for nonresidential floodproofed buildings, a registered engineer's or architect's certification. The floodplain administrator weighs ten factors in deciding whether to approve a permit, including the danger to life and property from flooding, the susceptibility of the proposed use to flood damage, the effect on other landowners, safety of emergency access, and the relationship to the comprehensive plan. 044, which can grant relief for historic structures without the normal procedure, for infill lots of a half-acre or less next to existing below-grade development, but never within a designated floodway if it would raise flood levels, and only on a showing of good cause and exceptional hardship.