Williamson County flood history
Texas · From FEMA's flood insurance and disaster data · Updated 2026-10-08
FEMA's National Flood Insurance Program (NFIP) data lists 741 flood insurance claims in Williamson County, Texas since 1978. The NFIP paid $22.3 million on them (building, contents and Increased Cost of Compliance payments, in the dollars of the year paid).
The year with the most claims was 2010, with 210.
In the last ten years (2017–2026) there were 69 claims, and the average paid claim was $96,808.
37% of the claims with a recorded flood zone came from buildings outside FEMA's high-risk zones (rated zones B, C and X).
About 1.1% of homes in Williamson County, Texas had an NFIP flood policy in FEMA's latest count (1,949 of 177,153 residential buildings). In the high-risk flood zones (Special Flood Hazard Areas), it was 46% (591 of 1,291).
Since 2000, FEMA has made 3 flood-related disaster declarations covering Williamson County, Texas. The most recent was DR-4879-TX (Severe Storms, Straight-Line Winds, and Flooding), declared July 6, 2025.
NFIP claims by year
Show as a table
| Year | Claims | Paid |
|---|---|---|
| 2026 | 5 | $352,009 |
| 2025 | 43 | $3.0 million |
| 2023 | 4 | $107,979 |
| 2022 | 1 | $39,093 |
| 2021 | 1 | $0 |
| 2020 | 2 | $55,361 |
| 2019 | 3 | $1,883 |
| 2018 | 8 | $262,270 |
| 2017 | 2 | $14,077 |
| 2016 | 11 | $165,015 |
| 2015 | 67 | $2.9 million |
| 2014 | 1 | $35,224 |
| 2013 | 18 | $486,345 |
| 2012 | 5 | $43,186 |
| 2011 | 1 | $0 |
| 2010 | 210 | $10.7 million |
| 2009 | 12 | $14,714 |
| 2008 | 5 | $6,962 |
| 2007 | 32 | $1.2 million |
| 2005 | 1 | $0 |
| 2004 | 10 | $146,847 |
| 2003 | 1 | $4,713 |
| 2002 | 4 | $8,129 |
| 2001 | 26 | $271,100 |
| 2000 | 3 | $32,381 |
| 1999 | 1 | $0 |
| 1998 | 6 | $13,599 |
| 1997 | 17 | $247,959 |
| 1996 | 5 | $84,204 |
| 1995 | 5 | $26,814 |
| 1994 | 8 | $83,858 |
| 1993 | 3 | $9,551 |
| 1992 | 5 | $69,632 |
| 1991 | 18 | $168,633 |
| 1990 | 2 | $8,431 |
| 1989 | 4 | $20,052 |
| 1987 | 9 | $46,629 |
| 1986 | 4 | $2,348 |
| 1985 | 8 | $16,220 |
| 1984 | 66 | $677,901 |
| 1983 | 4 | $8,973 |
| 1982 | 44 | $456,315 |
| 1981 | 48 | $354,549 |
| 1980 | 6 | $54,655 |
| 1979 | 2 | $4,306 |
Named flood events
| 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 | $677,550 |
| Flooding | 1981 | 35 | $301,779 |
| Fall severe storms | 2015 | 5 | $235,653 |
| Flooding | 1991 | 12 | $162,827 |
| Early summer severe storms | 2016 | 5 | $88,841 |
How many homes have flood insurance
FEMA counts 1,949 residential NFIP policies in Williamson County, against 177,153 residential buildings (1.1%). Of the 1,291 residential buildings in high-risk flood zones (Special Flood Hazard Areas), 591 have an NFIP policy (46%). Private flood policies aren't in these counts.
Whether you're required to carry flood insurance depends on your flood zone and your mortgage. See do I need flood insurance?
Flood-related disaster declarations
| Declaration | Declared | Event | Help for individuals |
|---|---|---|---|
| DR-4879-TX | Jul 6, 2025 | Severe Storms, Straight-Line Winds, and Flooding | Yes |
| DR-4223-TX | May 29, 2015 | Severe Storms, Tornadoes, Straight-Line Winds and Flooding | Yes |
| DR-1709-TX | Jun 29, 2007 | Severe Storms, Tornadoes, and Flooding | Yes |
Check your own address
County numbers can't tell you about a single building. Look up your property on FEMA's flood map, then read what your flood zone means. More counties: all of Texas.
Where these numbers come from
All figures on this page are calculated from FEMA's public OpenFEMA datasets:
- NFIP Redacted Claims (v3) (FEMA (OpenFEMA)): NFIP claims since 1978, downloaded 2026-10-08. Dollar amounts are what the NFIP paid, not adjusted for inflation. Claims filed under private flood insurance aren't included.
- NFIP Residential Penetration Rates (v1) (FEMA (OpenFEMA)): NFIP residential policy contracts in force (as of August 3, 2026) divided by FEMA's count of residential buildings from the National Structure Inventory. FEMA notes that inventory is incomplete in some counties, which can inflate the rate. Private flood policies aren't counted.
- Disaster Declarations Summaries (v2) (FEMA (OpenFEMA)): disaster declarations, downloaded 2026-10-08. We count a declaration as flood-related when FEMA lists flooding (or a dam or levee break) as its incident type or a designated incident type, or the declaration's title mentions flooding.
FEMA's redacted claims data doesn't identify properties, and FEMA notes that some records lack a county or flood zone. See how we use the data.