What matters for project planning
Of everything in that list, the high water table is what governs a Wilmington crawlspace. On low coastal ground the soil beneath a house is damp for much of the year regardless of rainfall, which is why a liner alone rarely holds conditions here and why dehumidification is part of the system rather than an upgrade to it. Salt-laden air adds a second load on any metal fastener or duct under the floor. In a local historic district, note that foundation vents and their treatment are exterior features that review can reach.
Official sources
Verify the property, not just the city
City-level information about Wilmington won't establish your parcel's flood zone, historic-district status, buffer requirements, soil type, or concealed conditions. Confirm those directly with the city or county and your chosen provider before work begins.
Checked June 2026 -- flood maps and ordinances change, especially after storm events, so confirm anything current separately.