How much is flood insurance in Austin?

Flood insurance in Austin ranges from $300/year in Zone X to $6,000+/year in AE zones along major creeks. Properties near Onion Creek and Shoal Creek pay the highest rates. Risk Rating 2.0 factors in flash flood intensity, which increases Austin premiums compared to flat-terrain cities.

What is Flash Flood Alley?

Flash Flood Alley is the region of Central Texas from Austin to San Antonio known for extreme flash flooding. Steep Hill Country terrain, shallow rocky soil, and intense thunderstorms combine to produce some of the most severe flash floods in North America. Austin has experienced devastating floods in 1981, 2013, 2015, and 2018.

What is the Onion Creek buyout program?

After severe flooding in 2013 and 2015, Austin launched a voluntary buyout program for hundreds of homes along Onion Creek. The city purchases flood-prone properties and converts them to open space. Over 700 properties have been acquired. The program has become a national model for managed retreat from flood-prone areas.

Can I build in an Austin flood zone?

Building in Austin flood zones is heavily regulated. The city enforces a no-rise policy in floodways, prohibits fill in 100-year floodplains, and requires elevation above BFE plus freeboard. No new residential construction is allowed in Onion Creek buyout areas. Impervious cover limits apply across all watersheds.

How fast do Austin creeks flood?

Austin creeks can rise from safe levels to dangerous flooding in under an hour during intense thunderstorms. Shoal Creek, Waller Creek, and Williamson Creek are especially flashy. The 2013 Onion Creek flood rose 40 feet in hours. Always heed flash flood warnings and never cross flooded roadways ("Turn Around, Don't Drown").

Austin, Texas · FEMA Region 6

Is Austin in a Flood Zone?

Q: Is Austin in a flood zone?

Parts of Austin are in FEMA flood zones, and Austin sits in "Flash Flood Alley," the most flash-flood-prone region in North America. Properties along Shoal Creek, Onion Creek, Williamson Creek, and Waller Creek are in AE zones. Flash flooding can affect areas outside mapped zones due to Austin's steep terrain and rocky soil. Enter your address at ReadyPermit for property-specific data.

High Flood Risk Area

Austin has high flood risk due to flash flooding along Shoal Creek, Onion Creek, Williamson Creek, and the Colorado River system. Central Texas is part of "Flash Flood Alley" — the most flash-flood-prone region in North America. Austin's steep terrain and impervious rock accelerate runoff, making flooding sudden and severe. The city has aggressive floodplain buyout programs and strict development regulations in flood-prone areas.

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FEMA Flood Zones in Austin

100-Year Floodplain (Detailed)

BFE established along Shoal Creek, Onion Creek, Williamson Creek, Waller Creek, and the Colorado River/Lady Bird Lake. Flood insurance required for federally backed mortgages.

100-Year Floodplain (Approximate)

No detailed BFE study. Found along smaller tributaries in developing areas of Travis County.

Sheet Flow / Shallow Flooding

Shallow flooding areas (1-3 feet) at the base of Austin's Hill Country terrain. Common in southwest and northwest Austin.

X (shaded)

500-Year Floodplain

Moderate risk. Extended areas along major creeks. The 2013 and 2015 floods inundated many X-zone properties.

Flood Insurance Costs in Austin

Zone AE (Shoal/Onion Creek): $2,000–$6,000/year
Zone AO (Hill Country): $1,000–$3,500/year
Zone X (shaded): $400–$1,000/year if purchased voluntarily
Zone X (unshaded): $300–$600/year (Preferred Risk Policy)
Risk Rating 2.0 factoring in flash flood intensity for Central Texas
Properties in buyout-eligible areas may face difficulty obtaining insurance

Building Requirements in Flood Zones

AE zones: lowest floor at or above BFE plus 1-ft freeboard; Austin enforces strict no-rise policy in floodways
No fill allowed in 100-year floodplain to raise building pads
Onion Creek buyout area: no new residential construction permitted
Critical Water Quality Zone: 25-year floodplain setbacks along creeks
Substantial improvement (>50% of value) triggers full floodplain compliance
Impervious cover limits in watersheds: 25-65% depending on zone classification

How to Check Flood Risk in Austin

1
Check your flood zone
Enter your Austin address into ReadyPermit or FEMA's Flood Map Service Center. The City of Austin Watershed Protection Department maintains detailed flood maps updated more frequently than FEMA.
2
Check creek proximity
Austin's flash flood risk is highest near creeks. Determine your distance to Shoal Creek, Onion Creek, Williamson Creek, Waller Creek, or other tributaries.
3
Get an Elevation Certificate
Required for insurance in A/AE zones. Hire a Texas-licensed surveyor ($350–$600).
4
Obtain flood insurance
Required for A/AE zones with federally backed mortgages. Strongly recommended for any property near Austin's creeks, even in Zone X.
5
Review building requirements
Austin has stricter floodplain rules than FEMA minimums. Check Watershed Protection Department for no-rise floodway, impervious cover, and setback requirements.
6
Check buyout eligibility
Austin has purchased hundreds of flood-prone properties along Onion Creek and other corridors. Check if your area is in a current or planned buyout zone.
7
Sign up for flood alerts
Austin's flood early warning system (ATXFloods.com) provides real-time creek levels, road closures, and flash flood warnings.

Frequently Asked Questions — Austin Flood Zones

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