What matters for project planning
Honestly, almost none of this framework reaches a floor coating. Historic-preservation guidance governs exterior appearance and would not ordinarily extend to an interior slab, and the stormwater program concerns where water goes outside the building. It would be padding to claim otherwise. The one genuine intersection is a garage or ground-floor slab on a parcel with known flood or drainage exposure, where the history of water reaching that slab is worth knowing before a coating is specified -- because it predicts the moisture the coating will have to live with.
Official sources
Verify the property, not just the city
General citywide information doesn't establish a specific parcel's flood zone, historic designation, stream buffer, permit requirements, soil conditions, or what's hidden in existing construction. Your chosen provider and the right Columbia-area authority are who can confirm those specifics before work begins.
Sources reviewed June 20, 2026. Local requirements and map data referenced here can be updated at any time.