FEMA rates relative riverine flooding risk for Dauphin County as relatively high and reports FEMA annualized frequency of 2.208 per year for the area.
FEMA summary
FEMA's profile for Dauphin County reports FEMA annualized frequency of 2.208 per year for riverine flooding. FEMA's relative risk rating for the area is relatively high; the annualized frequency is a separate measure.
Hazard metrics cover FEMA county-equivalent geographies rather than individual addresses or parcels. Use local or state hazard maps before making a property, insurance, retrofit, or evacuation decision.
Select a hazard to inspect FEMA's figures for Dauphin County.
Riverine Flooding
FEMA combines its area-wide loss estimate and community data in this relative rating. Event frequency appears separately below.
Relative FEMA score
98.7/100
Occurrence thresholds vary by hazard. The FEMA methodology defines the value for each hazard.
The area loss estimate combines FEMA's modeled losses to buildings, population, and agriculture across Dauphin County. It is not an estimate for a home or address.
City risk summary
For Harrisburg, FEMA rates riverine flooding risk for Dauphin County as relatively high, with a relative score of 98.7/100. The next highest relative scores are lightning at 94.5/100 and strong wind at 91.5/100.
Using FEMA data for Dauphin County, Harrisburg is #1 among 9 covered Pennsylvania entries for riverine flooding risk. York is about 23 straight-line miles from the Harrisburg map point; its FEMA figures cover York County.
For homeowners and movers
Preparedness actions
Living in Harrisburg? Learn how to handle water storage, sanitation, and security in a small space.
The map shows Harrisburg. All FEMA figures on this page cover Dauphin County.
The FEMA figures cover Dauphin County. Address-level conditions require local maps, building records, and property details.
FEMA rates relative riverine flooding risk for Dauphin County as relatively high. Its FEMA annualized frequency is 2.208 per year. Damage at a specific address also depends on the building, soil, elevation, and exact hazard zone.
Among 9 Pennsylvania cities covered by this directory, Harrisburg is #1 for relative riverine flooding risk based on FEMA's score for Dauphin County. Homes within Harrisburg can have different soil, elevation, construction, and hazard-zone conditions.
In FEMA's data for Dauphin County, the highest relative ratings are Riverine Flooding (Relatively High), Lightning (Relatively High), and Strong Wind (Relatively High). FEMA uses estimated losses and community data along with event frequency when assigning these ratings.
The hazard numbers cover Dauphin County. For an individual home, check local fault, flood, fire, evacuation, and building records for the exact address.
FEMA gives Dauphin County an overall relative risk rating of relatively moderate. Conditions at a specific home depend on its hazard zones, building type, maintenance, insurance, and access to evacuation routes and emergency services.
Start with this step: Confirm the exact hazard using official local maps before making property or insurance decisions. Know how local officials issue warnings and evacuation instructions. Use Ready.gov Be Informed and local emergency guidance for a complete plan.
Distances are measured between city coordinates.
| City | Distance | Riverine Flooding rating | Relative score |
|---|---|---|---|
| York, PA | 23 mi | Relatively Low | 72.2 |
| Lancaster, PA | 35 mi | Relatively Moderate | 88.1 |
| Reading, PA | 51 mi | Relatively Moderate | 90.7 |
| Hagerstown, MD | 62 mi | Relatively Moderate | 80.3 |
| Frederick, MD | 65 mi | Relatively Moderate | 90.4 |
Limited to products tagged for riverine flooding or general preparedness.
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View productHazard metrics come from FEMA National Risk Index v1.19.0 (March 2023). City population and coordinates come from SimpleMaps US Cities Database. For current conditions, use official local maps, warnings, inspections, and professional advice.