Relating to the authority of a county that borders the United Mexican States to regulate residential land use; creating a criminal offense.

HB 3578 allows counties bordering Mexico to adopt zoning rules for unincorporated areas with more than two residential units per acre. It authorizes regulations on building size, lot coverage, density, setbacks, and utility placement in these areas. The bill creates a criminal offense for violating these zoning rules, with enforcement handled by county commissioners courts. It applies only to border counties and requires public hearings and specific voting procedures for adoption. The bill remains pending in committee as of May 2025.