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Floodplain Information and Mapping

Floodplain inquiries are handled by the Department of Public Works and Transportation, which coordinates mapping with the Federal Emergency Management Agency (FEMA). Here are some resources for flooding and floodplain issues.

Preliminary Flood Insurance Rate Map

In accordance with FEMA, a multi-year project to reexamine Baltimore County’s flood zones and develop detailed, digital flood hazard maps has been completed. The new maps—also known as Digital Flood Insurance Rate Maps (DFIRM)—reflect current flood risks, replacing maps that are up to 15 years old.

For interpretation of the data contained on the map, please call Terry Curtis at 410-887-3117 or email

Interactive Floodplain Map Application

We have provided an online interactive mapping application to the Digital Flood Insurance Rate Map (DFIRM), which contains the floodplain data as published by FEMA. This application enables users to select, view and print predefined maps and reports about floodplains in Baltimore County. View instructions (PDF) for using the application.

The application also contains data on Letters of Map Amendment (LOMA), Letters of Map Revision (LOMR) and all letters of map change, including the ability to download the LOMA.

If you have problems with the interactive mapping application, please call Doug Adams at 410-887-3451 or email

For interpretation of the data contained on the map, please call Terry Curtis at 410-887-3117 or email


The data in the DFIRM have an effective date of September 26, 2008 and should be used to comply with the Baltimore County Code 2003, Title 04 Department of Public Works and Transportation, Subtitle 02 Flood Insurance Rate Maps, Authority: Sections 32-8-202(a) and 32-8-203(d). New tidal floodplain maps and regulations (PDF) were effective May 5, 2014.

Nuisance Flooding Plan

Review the Nuisance Flooding Plan (PDF).

Revised June 9, 2021         


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