Write down what you're seeing
Note where it is in the house, when you first noticed it, whether it tracks with rain or a particular season, how it's changed, and any repairs already tried. A few photos and rough measurements go a long way toward a useful first call.
Read the local context
A city founded in 1702 accumulates a lot of different wall assemblies, and that is the reason Mobile's history belongs on a page about moisture. The oldest housing near the port was built to dry outward through plaster, board sheathing and open framing -- assemblies that tolerate humidity but move air and moisture between floors in ways modern construction does not, which complicates containment. The twentieth-century neighborhoods reaching north toward Prichard and Saraland and south toward Theodore introduced tighter envelopes and air conditioning, which brought a newer failure mode: cool interior surfaces meeting humid Gulf air inside a wall cavity, with no leak involved at all. Establishing which kind of building you are in shapes the whole approach.
Ask what happens once the walls close back up
What you can see now is a fraction of the picture. Push for a plan that names the water source, addresses humidity, checks material condition, sets up containment, and includes verification once the job wraps. Get the preparation and testing steps written into the scope, since none of it will be visible once the work is finished.
Put proposals side by side, not just prices
Look at how each one protects the rest of the house, handles access, chooses materials, covers permits and testing, plans cleanup and restoration, and spells out exclusions, warranty terms, and how change orders get handled.
What official local sources add
Neither record governs remediation itself, so their value here is historical rather than regulatory. What the city's floodplain information gives you is the parcel's flood history and mapped status, and that changes what an assessment should look for: a property that has taken water before warrants opening and checking wall cavities for contamination left from an earlier event, not only inspecting for what is visible today. Historic-district status matters only if remediation leads to visible exterior reconstruction, at which point Commission review can apply.
Sources were reviewed 2026-07-19. Flood zones, historic-district boundaries, and permit rules are decided parcel by parcel -- check yours directly with the city before signing off on any work.