Natural hazards · Alton

Alton, TX natural hazards

Most of the natural-hazard damage FEMA expects in Alton comes from hurricanes, and overall the risk is high for a U.S. community. Flood insurance has paid 3 claims here since 2018. 8 federal disasters brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations
Expected damage

How exposed is Alton?

75
High
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Alton to be higher than in 75% of U.S. communities, mostly from hurricanes and cold waves.

Hurricanes37%Cold waves27%Inland flooding23%Heat waves6%Everything else8%
By hazard

What Alton faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Hurricanes

37% of expected damage
Well above average · higher than 94% of U.S. places
Recorded about once every 8 years in the area

Cold waves

27% of expected damage
Well above average · higher than 94% of U.S. places
Recorded about 3 times a year in the area

Inland flooding

23% of expected damage
Above average · higher than 51% of U.S. places
Recorded about 2 times a year in the area

Heat waves

6% of expected damage
Above average · higher than 56% of U.S. places
Recorded about 8 times a year in the area

Lower here

TornadoesHailIce stormsWinter weatherWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity
Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.
Flood insurance claims

Does Alton flood?

Every paid claim on a federal flood insurance policy in Alton, from FEMA’s records.

3paid claims since 2018
$38Kpaid to owners
0homes flooded more than once
20182026

Biggest named events

  • Hurricane Hanna: 2 claims, $34K
of all homes
are insured
No community discount. Alton isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Hidalgo County.
Disasters that hit Alton

8 federal disasters brought FEMA money here

Disasters the President declared that paid out in Alton itself: aid to households, or repair grants to the City of Alton.

Brought FEMA money into AltonDeclared for Hidalgo County only
2025

Severe Storms and Flooding

44 households applied for aid $129K aid approved
2021

Severe Winter Storms

45 households applied for aid $20K aid approved
2019

Severe Storms and Flooding

5 households applied for aid
2018

Severe Storms and Flooding

64 households applied for aid $60K aid approved
2016

Severe Storms and Flooding

8 households applied for aid
2015

Severe Storms, Tornadoes, Straight-Line Winds and Flooding

11 households applied for aid
2010

Hurricane Alex

7 households applied for aid
2008

Hurricane Dolly

116 households applied for aid $52K aid approved
Hidalgo County has had 27 natural disasters declared since 1953, most often hurricanes and floods.
Around Alton

Alton and the towns around it

West Sharyland: High, mostly hurricanesMcAllen: High, mostly hurricanesMission: High, mostly hurricanesEdinburg: High, mostly hurricanesPharr: High, mostly hurricanesGranjeno: Moderate, mostly hurricanesHidalgo: Moderate, mostly hurricanesAlton: High, mostly hurricanes AltonWest SharylandMcAllen
Very lowLowModerateHighVery high
Altonmostly hurricanesHigh
McAllenmostly hurricanesHigh
West Sharylandmostly hurricanesHigh
About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Alton covers 3 census tracts, combined by population.
Money that reached townFlood claims are matched to Alton’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Alton. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across Alton total about $3.9M a year, counting buildings, people and crops.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01