Search the property address on FEMA’s Flood Map Service Center, the official public source for flood hazard information produced for the National Flood Insurance Program, and note the flood zone shown on the current map. Then confirm the result with the county or city, because a map is a starting point, not a site survey. Hays County, for example, requires a permit for any kind of development as part of its participation in that program.

Key takeaways

  • FEMA’s Flood Map Service Center is where you look up the official flood map for an address.
  • High-risk Special Flood Hazard Areas are shown as zones beginning with A or V.
  • Zones B, C, and X mark moderate or minimal flood hazard on the map.
  • Hays County requires a development permit for any kind of development, which it ties to the National Flood Insurance Program.

How do you look up a lot on FEMA’s flood map?

Enter the street address on the Flood Map Service Center. If the land has no address yet, search a nearby address or place name, then locate the parcel on the map. Note the flood zone label that covers the land, the map panel number, and the effective date, and save a copy of the panel or report for your due diligence file.

Large acreage can cross more than one zone. A creek along one boundary may put part of a tract in a high-risk area while the likely homesite sits outside it. That difference matters for where the house, driveway, septic system, and well can go.

What do the flood zone letters mean?

FEMA’s flood zone definitions describe Special Flood Hazard Areas as the land that would be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year. Those high-risk areas carry labels beginning with A or V, such as A, AE, or AO. Zone B and shaded Zone X mark the areas between that base flood and the 0.2-percent-annual-chance flood, and Zone C or unshaded Zone X marks minimal flood hazard.

A map label is not the whole story. Water can rise quickly in draws and creek corridors, such as the Blanco River and Cypress Creek in Wimberley, and some small drainage paths do not appear on flood maps at all. Walk the land after rain if you can, and ask a surveyor or engineer to review local drainage before the house location is fixed.

What permits apply near a floodplain in Hays County?

According to the Hays County Development Services FAQs, the county requires a permit for any kind of development in order to participate in the National Flood Insurance Program. The county defines development broadly, as all land modification activity, including man-made changes to improved and unimproved real estate. Cities run their own permitting inside city limits, so confirm which authority governs the parcel.

If part of the building area is in a mapped high-risk zone, expect more design questions about finished floor height, fill, drainage, and access. The guide to permits in Hays and Travis counties explains how to confirm which authority reviews a specific parcel.

When should you check the flood map?

Check before you buy, and again before design. A lot with part of its buildable ground in a high-risk zone may still work, but it changes the site plan, the budget, and possibly insurance and lending questions. Our guide to buying land in the Texas Hill Country and builder lot walk checklist put the flood check alongside access, septic, and utilities.

Keep the map panel, survey, and any elevation information with your property records. The Central Texas cost guide shows how site conditions move a project number, and our Wimberley and Driftwood guides cover local planning questions for those areas.

Frequently asked questions

Is FEMA’s flood map the final word on flood risk for a lot?

No. The Flood Map Service Center is the official source for flood hazard maps under the National Flood Insurance Program, but small drainage paths and recent site changes may not appear on them. Confirm with the local floodplain office and a surveyor or engineer.

What does Zone AE mean on a flood map?

Zone AE is one of the high-risk Special Flood Hazard Area labels. FEMA defines those areas by the flood that has a 1-percent chance of being equaled or exceeded in any given year.

Do I need a permit to build near a floodplain in Hays County?

Hays County requires a permit for any kind of development, which it ties to its participation in the National Flood Insurance Program. Inside city limits, check with the city’s permitting office.

Can part of a lot be in a flood zone while the homesite is not?

Yes. Flood zone boundaries follow creeks and drainage, so a large tract can include more than one zone. Check the homesite, driveway, septic area, and well location against the map.

Knowing where the water goes is part of choosing where the house goes. Use Build Studio to organize your property details, or contact Ridge Rock Builders to talk through a lot you are considering.