In Hays County, even clearing land outside the floodplain needs a permit

Hays County learned the hard way what fast water does. The 2015 Memorial Day flood that swept the Blanco River through Wimberley is why the county watches land changes closely. So its rule is blunt: all development requires a permit, inside or outside the mapped floodplain. The reach of that word 'development' is the part that surprises people. It isn't just houses. It's roads, paved storage areas, parking lots, stormwater facilities, fill dirt, slabs and foundations, sheds, swimming pools, and even clearing. Scrape the brush off a tract to open it up and you've done something the county wants permitted.

The logic is simple once you've watched a creek rise. Every acre you pave, fill, or clear sends more water faster to the next property downstream, and in Flash Flood Alley that runoff adds up quickly. A permit lets the county check that your project isn't quietly worsening a neighbor's flooding.

If you're planning to grade, fill, pave, or clear out in the unincorporated county, a five-minute call to Hays County Development Services before the dozer shows up is cheaper than a stop-work order after. Ask whether your specific job needs a development permit — the answer is yes more often than landowners expect.