Austin is in the middle of a citywide floodplain remap that uses newer rainfall data. In short, big storms are more common than old maps assumed. That means more homes now show up in higher-risk zones, which can affect insurance, lending, building rules, appraisals, and resale strategy.
Why maps are changing
- NOAA’s Atlas 14 study added decades of rainfall records and found that the 1 percent annual chance storm in Central Texas is larger than before. In parts of Austin, the 24-hour amount increased in the updated frequency analysis. See: NOAA Atlas 14 PFDS
- The City of Austin and Travis County are using Atlas 14 to update local flood models and maps. As those maps roll out, more properties are showing up in high-risk areas. See: Floodplain Management | City of Austin and ATXFloodplains hub
- Recent reporting from KUT highlights the scope of changes expected as new maps are adopted.
How to check your risk in 5 minutes
1) Start with Austin FloodPro for local detail
Open FloodPro, the City’s interactive map. Enter your address to see if your property is within a mapped floodplain. You can also view past flood studies, drainage infrastructure, and available elevation certificates. Save a PDF for your records. Help page: View floodplain maps and storm drain infrastructure
2) Confirm with FEMA’s Map Service Center
Search your address in FEMA MSC to view the official Flood Insurance Rate Map and download a FIRMette. More on flood maps: FEMA Flood Maps overview and National Flood Hazard Layer tools
3) Learn the labels
Special Flood Hazard Areas usually appear as Zone A or AE. These areas have a 1 percent annual chance of flooding. Lenders typically require flood insurance in these zones for federally backed mortgages. See the FEMA resources above.
What the terms mean
- 100-year floodplain: An area with a 1 percent annual chance of flooding. Atlas 14 raised the rainfall used to define this in parts of Austin. Atlas 14 FAQ (City of Austin PDF)
- Base Flood Elevation (BFE): The water surface height of the 1 percent annual chance flood. Your structure’s lowest floor relative to BFE helps determine insurance needs and building requirements.
- Elevation Certificate: A document prepared by a licensed surveyor or engineer that shows floor elevations relative to BFE. It is often required for insurance rating and new construction.
If your home shows up in a floodplain
- Insurance: Lenders usually require flood insurance in Zone A or AE. Start quotes early and compare coverage, deductibles, and exclusions, not just price. FEMA Flood Maps overview
- Permitting and remodels: Austin rules require finished floors to be set above the mapped flood elevation with added freeboard, and displaced floodplain storage must be mitigated. Local guidance: Floodplain Development Information and code reference: Combined Flood Plain Regulations (PDF)
- Selling soon: Expect more questions from buyers and lenders. Have your FloodPro printout, any elevation certificate, and insurance quotes ready to reduce surprises.
Buyer and seller game plan
- For sellers: Preempt appraisal and lending hiccups by organizing documentation and addressing typical valuation snags early. See our guide: How to Prevent and Overcome Appraisal Issues in Real Estate
- For buyers: During the option period, pull FloodPro and FEMA MSC, request any elevation certificate, and obtain an insurance quote. Keep your steps organized with our Free Resources for Buyers.
- For homeowners reviewing taxes: If flooding or drainage affects market value, know your rights at protest time. Read Property Taxes in Central Texas: How to Protest Your Appraised Value.
Frequently asked questions
Will new maps force me to buy flood insurance? If your structure is shown in a Special Flood Hazard Area and you have a federally backed mortgage, your lender will likely require it.
Do I need a new elevation certificate? If you do not have one, or if the certificate is outdated for your insurer, getting a current document can help with accurate rating and design decisions.
Do local rules change how I remodel or build? Yes. Austin requires finished floors above flood levels and may require compensatory storage and safe access. Check with the Watershed Protection Department and a qualified engineer early in planning. Floodplain Development Information
How we can help
Send us your address and we be happy to pull your flood zone information for you. If you are buying or selling, we will coordinate quotes, docs, and timelines with your lender and inspector. For a deeper dive on appraisal prep, read our Appraisal Issues guide. Contact us today to make sure your home's flood status hasn't changed.
