Lake Charles, LA Environmental Rules: Flood Zones (2026)

' Where fill material is required, an equal quantity of fill must be removed from the construction site so no floodplain storage volume is lost. The rule applies inside designated floodways and flood hazard areas A, AE, and VE, and the floodplain manager or city engineer can extend it to other areas where observed flooding exceeds FEMA's base flood elevations. It exempts new residential subdivisions of three lots or fewer, single-family or duplex construction on lots (in the city or annexed from the parish) platted before January 1, 2021, and waterfront-area development that will not impact low-lying floodwater conveyance.

Waivers are available from the city engineer for subdivisions of three acres or less, minor regrading fill under six inches, up to a 10 percent allowance for ground-condition variance, and redevelopment that cuts impervious area by at least 20 percent. A fill mitigation plan must be sealed by a licensed Louisiana engineer (smaller developments may use a licensed contractor, architect, or surveyor instead) and must show that fill volume is offset by excavation within the same watershed, submitted alongside any required stormwater runoff management plan.

Builders can avoid the fill mitigation requirement entirely by using FEMA-compliant open foundation techniques, such as piers, posts, or pilings, per § 6-486(h). No building permit for covered development is issued without demonstrated compliance, per the article's general drainage requirements in § 6-484(c).