5 county-level rules, plus city-specific rules for 3 cities in Harrison County, Mississippi.
Verified from official government sources
Harrison County enforces MS4 stormwater permit requirements. New construction over 1 acre needs stormwater management plans. Gulfport and Biloxi follow Mississippi DEQ NPDES Phase II rules with coastal-specific runoff controls.
Harrison County requires silt fencing and erosion BMPs on all land-disturbing activities over 0.5 acre. MDEQ Small Construction permits apply at 1 acre. Coastal sediment reaching the Gulf triggers federal Clean Water Act violations.
Harrison County enforces strict coastal development rules under MS Coastal Wetlands Protection Act §49-27. Mississippi DMR permits required for any work waterward of mean high water. Katrina rebuilding codes set elevated construction standards Gulf-wide.
Harrison County enforces FEMA floodplain rules with Katrina-hardened standards. Most coastal properties are in VE or AE zones requiring elevation above Base Flood Elevation plus 1-2 feet freeboard. Flood insurance mandatory.
Harrison County requires grading permits for excavation or fill over 50 cubic yards. Drainage must not redirect water onto neighbors under MS riparian and civil-law drainage rules. Retaining walls over 4 feet need engineering.
3 cities in Harrison County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Harrison County — parking, noise, fences, fires, animals, pools, and more.
Harrison County Ordinance Hub →