Flood insurance in Williamson County, Texas
How many buildings are insured against floods, what policies cost, and how much FEMA's flood insurance program has paid out, from official NFIP records.
Flood claims paid per year
NFIP claims paid in Williamson County, 2000–2026
The three costliest years. The worst was 2010, with $10.7 million paid on 210 claims.
Insured buildings by flood zone
Zone not reported for 39% of policies; shares are of policies with a known zone.
Costliest flood events
Named events by NFIP claims paid in Williamson County
| Event | Year | Claims | Paid |
|---|---|---|---|
| 2025 July Central TX Flooding | 2025 | 38 | $3.0 million |
| Early summer storms | 2015 | 54 | $2.5 million |
| Thunderstorms | 2007 | 29 | $1.2 million |
| Flooding | 1984 | 65 | $678 thousand |
| Flooding | 1981 | 35 | $302 thousand |
Flood insurance by ZIP code
ZIP codes in Williamson County with at least 50 policies
| ZIP | Policies | Avg premium | Claims since 1978 | Paid |
|---|---|---|---|---|
| 78641 | 346 | $1,099 | 104 | $3.9 million |
| 78633 | 314 | $683 | 24 | $710 thousand |
| 78681 | 211 | $1,166 | 158 | $4.5 million |
| 78628 | 211 | $724 | 48 | $1.6 million |
| 78664 | 176 | $986 | 138 | $3.7 million |
| 78613 | 160 | $618 | 61 | $1.2 million |
| 78634 | 155 | $777 | 17 | $1.0 million |
| 78626 | 143 | $1,103 | 56 | $2.7 million |
| 78665 | 132 | $774 | 14 | $189 thousand |
| 78642 | 126 | $1,600 | 38 | $3.0 million |
| 78729 | 98 | $609 | 37 | $895 thousand |
| 76574 | 75 | $839 | 60 | $1.5 million |
| 78750 | 70 | $479 | 58 | $666 thousand |
Common questions
How much does flood insurance cost in Williamson County?
The average NFIP flood insurance policy in Williamson County costs about $846 a year. The Texas average is $1,016. Your own premium depends on your building's flood risk, elevation and the coverage you choose.
How many homes have flood insurance in Williamson County?
There are about 2,044 National Flood Insurance Program policies in force in Williamson County, according to FEMA's latest policy data. Private flood policies are not included.
How often does Williamson County flood?
Since 1978, NFIP policyholders in Williamson County have filed 741 flood claims, with $22.3 million paid out. 69 of those claims were in the last 10 years.
Does homeowners insurance cover flooding?
No. Standard homeowners and renters insurance policies exclude flood damage. You need a separate flood policy from the NFIP or a private insurer.
How long until a new flood policy starts?
NFIP policies usually have a 30-day waiting period, so buying when a storm is already forecast is normally too late. Exceptions apply, for example when a lender requires the policy at closing.
How to get flood insurance
Most flood policies are sold through the National Flood Insurance Program by regular insurance agents. Ask the agent who handles your home or car insurance, or find one through FloodSmart.gov, FEMA's official flood insurance site. Private flood insurers also sell policies in many areas and are worth comparing.