FEMA Floodplain

The Federal Emergency Management Agency is proposing updates to the Flood Insurance Rate Map (FIRM) for Frederick County and invite the public to participate in a 90-day appeal and comment period. The 90-day appeal period began April 29, 2021. Residents, business owners and other community partners are encouraged to review the updated maps to learn about local flood risks and potential future flood insurance requirements. They may submit an appeal if they perceive that modeling or data used to create the map is technically or scientifically incorrect.  Link to the New FEMA Mapping Effort.

The FEMA Floodplain is defined as the combined area of the 100-year frequency flood (including the floodway and floodway fringe), and approximate floodplain.

Floodplain Regulations

Adopted Floodplain Maps

Resources from FEMA

Elevation Certificate

MT-EZ Form

National Flood Insurance Program

Process for Construction Within a Floodplain

FEMA Mapping and Insurance eXchange (FMIX) Customer Care Center 

Flooding Soils

Flooding soils are those soils with the characteristic of flooding, or the temporary inundation of an area caused by overflowing streams, by runoff from adjacent slopes, or by tides as identified in the Soil Survey of Frederick County, Maryland and the Web Soil Survey, Water Features table, as amended.

Frederick County Soil Atlas

USDA Web Soils Survey


Wetlands are defined as any land which is either considered private wetland or state wetland pursuant to Title 9, Wetland and Riparian Rights, Natural Resources Article, Annotated Code of Maryland, or defined as wetland under the procedures described in the "Federal Manual for Identifying and Delineating Jurisdictional Wetlands" by the Federal Interagency Committee for Wetland Delineation, 1989, as amended.

Maryland Department of the Environment