FEMA flood zones · Texas

Washington County, Texas Flood Zone Map

71 flood insurance claims·$1.7M paid·8 federal flood & hurricane disasters

19% of Washington County’s area is in FEMA’s high-risk flood zones.

Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.

Coastal high risk (V, VE)FloodwayHigh risk (A, AE)Moderate (X, 500-year)Minimal (X)Undetermined (D)

Shaded areas are FEMA’s mapped flood hazard zones in and around Washington County, Texas. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.

How Washington County floods

Flash flooding from severe weather events dominates the flood profile of Washington County, Texas, backed by 41 recorded flash flood events and 5 deaths over the last 30 years, alongside 4 tropical storm events. Recent history highlights this severe threat, such as the series of disturbances in January 2024 that resulted in numerous flash flood events, the flooding of many homes, extensive high-water rescues, and a flood-related fatality.

National Flood Insurance Program records indicate that flood risks extend significantly outside traditionally mapped high-risk areas. Properties in Zone X experienced the highest claim volume and severity with 37 claims, an average payout of $40,877, and an average recorded water depth of 38 inches. Zone A properties recorded 18 claims with an average payout of $20,358 and an average water depth of 7 inches, while Zone X_UNSHADED recorded 9 claims with an average payout of $16,905 and an average water depth of 19 inches. Zone UNKNOWN recorded 6 claims with an average payout of $3,949 and an average water depth of 1 inch, and Zone V recorded 1 claim with a $5,500 payout and an average water depth of 5 inches.

Homeowners, real estate agents, and journalists should pay the most attention to properties in Zone X, which accounted for the vast majority of claims and the deepest average water levels, demonstrating that significant flood risks exist outside of standard high-risk flood zones.

Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.

Where the flood claims came from

32% of Washington County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

28 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.

How deep the water got

outlet80″ door12″24″36″48″60″72″84″

In flood insurance claims here that reported a flood depth, the average was 23 inches.

Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.

Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.

Flood claims, year by year

The worst year was 2016, with 37 claims and $1.4M paid, the year of Severe Storms and Flooding.

1978: 1 claims1979: 4 claims1980: 2 claims1983: 2 claims1986: 1 claims1989: 1 claims1994: 1 claims1998: 1 claims2002: 4 claims2003: 1 claims2004: 1 claims2005: 1 claims2009: 1 claims2012: 1 claims2013: 1 claims2014: 2 claims2015: 3 claims2016: 37 claims2017: 4 claims2019: 1 claims2021: 1 claims19801990200020102020

Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.

In their words

8 NOAA storm reports from Washington County describe what happened, in the words of the forecasters who covered it. Read the Texas flood stories →

Federal disasters

20 federal disaster declarations since 1993, 8 of them floods, coastal storms or hurricanes.

DisasterBegan
Hurricane BerylJul 5, 2024
Severe Storms, Straight-line Winds, Tornadoes, And FloodingApr 26, 2024
Severe Winter StormFeb 11, 2021
Severe Winter StormsFeb 11, 2021
Hurricane HarveyAug 23, 2017
Severe Storms And FloodingMay 22, 2016
Severe Storms And FloodingApr 17, 2016
Severe Storms, Tornadoes, Straight-line Winds And FloodingMay 4, 2015

Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.

Recorded flood events

45 since 1996: 41 flash floods.

EventDateDamage
Flash FloodJan 24, 2024—
Flash FloodOct 31, 2018—
Flash FloodMar 29, 2018—
Flash FloodAug 27, 2017—
Tropical StormAug 25, 2017$150.0M
Flash FloodMay 26, 2016$10.0M · 5 killed
Flash FloodMay 25, 2015—
Flash FloodOct 24, 2015—

— = no damage estimate in the record. Source: NOAA Storm Events Database.

From the storm reports

Flash Flood · Jan 24, 2024. A series of disturbances moved across the area resulting in numerous flash flood events that resulted in the flooding of many homes, extensive high water rescues, and a flood-related fatality.

Flash Flood · Oct 31, 2018. Strong damaging wind gusts and one tornado occurred in association with the passage of a squall line of thunderstorms.

Flash Flood · Mar 29, 2018. A line of thunderstorms produced some wind damage, flash flooding and a tornado.

Flash Flood · Aug 27, 2017. Harvey made landfall as a category 4 hurricane near Rockport, Texas during the evening of August 25th. The storm then weakened to a tropical storm and slowed, looping back and tracking over SE Texas then back over the Gulf of Mexico making a second landfall along the Louisiana coast during the early morning hours of August 30th. Over that 5 day period over Southeast Texas TS Harvey produced catastrophic flooding…

National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.

The zones you’ll see on the map

Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.

Cross-section of a river floodplainDiagram: a river valley. The floodway is the channel and the land beside it; the 1%-annual-chance flood surface (the base flood elevation) covers the valley floor as zone A or AE; a narrow band higher up is shaded X, the 0.2% floodplain; higher ground is X.0.2% CHANCE A YEAR (500-YEAR)BASE FLOOD ELEVATION · 1% A YEARXAEFloodwayAEX
  1. A / AE Inside the 1%-a-year floodplain: about a 26% chance of flooding over a 30-year mortgage. AE has a mapped base flood elevation; plain A does not.
  2. Floodway The channel and the land beside it that has to be kept clear enough to carry the flood. Building here is tightly limited.
  3. X shaded The 0.2% (500-year) floodplain, plus some levee-protected and very shallow flood areas.
  4. X Outside both lines. No federal requirement to insure, which is not the same as no risk.

Every flood zone code explained →

Flood insurance in Washington County

If a building in Washington County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.

Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.