We recommend you call the Conservation Office at (203) 854-7744 to discuss the scope of your project. Permit level is determined by a variety of factors, including the proximity of all activities to the water resource, the amount and type of activity, the total cubic yards of material displaced, and the existing character of the land where the activity is proposed.
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FEMA produces Flood Insurance Rate Maps (FIRMs) that are best viewed digitally. We recommend you head to FEMA's Flood Map Service Center webpage where you can search by address to find maps of your area.
To learn more about special flood hazard zones in Norwalk, there are additional resources here on the Planning & Zoning webpage.