Natural hazards · Onaka

Onaka, SD natural hazards

Most of the natural-hazard damage FEMA expects in Onaka comes from cold waves, and overall the risk is low for a U.S. community. 2 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Onaka?

Low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Onaka to be higher than in 37% of U.S. communities, mostly from cold waves and inland flooding.

Cold waves42%Inland flooding23%Hail13%Tornadoes6%Everything else15%

By hazard

What Onaka faces

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

Cold waves

42% of expected damage

Above average · higher than 69% of U.S. places

Recorded about 11 times a year in the area

Inland flooding

23% of expected damage

Below average · higher than 44% of U.S. places

Recorded about once a year in the area

Hail

13% of expected damage

Well above average · higher than 86% of U.S. places

Recorded about 4 times a year in the area

Tornadoes

6% of expected damage

Well above average · higher than 75% of U.S. places

Recorded about once every 2 years in the area

Lower here

Ice stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingHurricanesAvalanchesTsunamisVolcanic 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 Onaka flood?

FEMA's records show no paid flood insurance claims in Onaka.

of all homes
are insured

No community discount. Onaka isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Faulk County.

Disasters that hit Onaka

2 federal disasters brought FEMA money here

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

Brought FEMA money into OnakaDeclared for Faulk County only

2010

Flooding

$995 to the Town of Onaka for repairs

2005

Severe Storm

$6K to the Town of Onaka for repairs

Faulk County has had 15 natural disasters declared since 1953, most often floods and severe storms.

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. Onaka is smaller than a census tract, so it shares the figures of the tract around its center.

Money that reached townFlood claims are matched to Onaka’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Onaka. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

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.