guide · Chattanooga, Tennessee
Permits, Flood Zones, and Regulatory Requirements
Drainage work in Chattanooga involves specific regulatory requirements, including permits for land disturbance, utility locates, and floodplain considerations. Understanding these rules is essential before starting any project.
Land Disturbing Permits
A Land Disturbing Permit may be required at 1,000 square feet or more of land-disturbing activity. The city's performance standards table shows documentation requirements varying by disturbed area and impervious area.
Some residential scopes may be treated differently under applicable rules. The City of Chattanooga should determine whether a specific excavation needs a permit or qualifies for an exception.
Flood Risk and Zoning
The city provides a public property flood-risk tool with flood zone, Base Flood Elevation (BFE), Design Flood Elevation (DFE), and compliance warnings. Hamilton County separately provides flood resources for properties under county jurisdiction.
Users should check the applicable office about floodplain review, retaining walls, curb/right-of-way work, and any public storm connection before proceeding.
Utility Locate Requirements
Tennessee 811 requires at least three full business days' advance notice for any excavation, including hand digging and grading. Member utilities mark facilities they installed or maintain.
Not every utility is a member, and privately owned lines may require separate locating. Positive response should be confirmed before digging.
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Stormwater and Erosion Control
Chattanooga defines land-disturbing activity broadly to include grading, excavation, filling, stockpiling, and other changes that may move sediment.
Tennessee's construction-stormwater program applies state NPDES requirements to covered construction activity. Large or common-plan projects require separate professional review.
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Frequently asked questions
When is a Land Disturbing Permit required?
A permit may be required for land-disturbing activities covering 1,000 square feet or more. The city determines specific requirements based on the project scope.
How do I check my property's flood risk?
The City of Chattanooga provides a public property flood-risk tool with flood zone, BFE, and DFE. Hamilton County has separate resources for unincorporated areas.
How far in advance must I call 811?
Tennessee law requires at least three full business days' advance notice to Tennessee 811 before any excavation, including hand digging and grading.
Does the state NPDES permit apply to small residential jobs?
Tennessee's construction-stormwater program applies to covered construction activity. Large or common-plan projects require separate professional review rather than extrapolation from a small residential job.