Hidalgo County primarily regulates unincorporated areas, while incorporated cities maintain exclusive jurisdiction over building permits and zoning within their limits. The county enforces floodplain management regulations and subdivision platting requirements for all development outside city limits. Development in unincorporated areas must comply with county drainage and infrastructure standards.
How this fits with the state
The state authority here is Texas Department of Licensing and Regulation; Texas State Board of Plumbing Examiners. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.