A flood claim goes to your NFIP or private flood carrier, not to your homeowners insurer — they are separate policies and a homeowners claim will be denied for flood water. Report it the day you find it. NFIP requires a signed Proof of Loss, normally within 60 days of the loss, and the documentation you gather in the first hours is what it is built from: video of every affected room before anything is moved, photographs of the high-water line, a list of damaged contents with what you paid, and receipts for emergency mitigation.
Cobb County participates in NFIP with a CRS discount; because East Cobb's creek systems were remapped under updated LiDAR surveys between 2014 and 2019, some properties previously designated Zone X (minimal risk) were reclassified into Zone AE—check FEMA's Flood Map Service Center with your exact Marietta address before assuming you do not need flood coverage. Mitigation is not optional — every policy requires you to stop further damage, so drying starts before the adjuster arrives, and you keep the invoices.
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