Maryland faces flood risk from the Chesapeake Bay, Atlantic coastal storm surge, Potomac River flooding, and urban flash flooding in the Washington D.C. and Baltimore metro areas. The Chesapeake Bay creates extensive tidal flooding exposure across the state's eastern shore. Tropical Storm Lee in 2011 caused record flooding along the Potomac River with Cumberland and western Maryland communities experiencing devastating damage. Ellicott City in Howard County has experienced two 1,000-year flood events in two years, 2016 and 2018, causing hundreds of millions in damage to the historic Main Street district. The Patapsco River valley through Baltimore County faces significant flood risk. Flash flooding is a growing concern across the state as development continues in the Baltimore-Washington corridor. Hurricane Agnes in 1972 caused the worst flooding in Maryland history, inundating Baltimore and causing over $2 billion in adjusted damage. The state has over 300 NFIP-participating communities. Sea level rise projections of 1-3 feet by 2060 threaten to significantly expand flood zones along the Chesapeake Bay and Atlantic coast.
Maryland Flood Zones
FEMA Flood Zone Lookup in Maryland
Look up any address in Maryland to find its FEMA flood zone designation, insurance requirements, and base flood elevation — sourced from the official National Flood Hazard Layer.
Zone AE along the Potomac, Patuxent, Patapsco, and Susquehanna rivers; Zone VE along the Chesapeake Bay and Atlantic coast; Zone X (shaded) for moderate-risk areas in Baltimore and Washington suburbs; Zone AH for shallow flooding in tidal marsh areas.
Howard County, Baltimore County, Montgomery County, Prince George's County, Talbot County
NFIP premiums range from $700-$1,500 for standard-risk properties. Chesapeake Bay coastal properties can run $2,500-$6,000+ annually. Howard County properties near Ellicott City have seen significant premium increases due to repeated flood events.
Frequently Asked Questions — Maryland
How can Ellicott City have two 1,000-year floods in two years?
Ellicott City's geography with a narrow valley channeling water into Main Street makes it extremely vulnerable to extreme rainfall. Urban development upstream and climate change have intensified the flooding events.
Does the Chesapeake Bay cause flooding in Maryland?
Yes. The Chesapeake Bay creates tidal flooding across Maryland's eastern shore and coastal communities. Annapolis has experienced regular sunny-day tidal flooding in recent years due to sea level rise.
Is flood insurance expensive in Maryland?
Inland properties may pay $700-$1,200 annually, while Chesapeake Bay and Atlantic coast properties can pay $2,500-$6,000+. Risk Rating 2.0 has increased premiums for many coastal and riverine properties throughout the state.
Disclaimer: FloodZoneCheck is a free research tool using public FEMA data, not an official Standard Flood Hazard Determination. Lenders require a certified determination from a licensed provider. Zone boundaries can cross a single parcel — confirm exact risk and insurance requirements with FEMA or your insurer before relying on this for a purchase or insurance decision.
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