Middlesex County, NJ Environmental Rules: Flood Zones (2026)

Floodplain development in Middlesex County is governed by two parallel systems. Federal layer: FEMA's National Flood Insurance Program, authorized by the National Flood Insurance Act of 1968 (42 U.S.C. 4001 et seq.) and implemented at 44 CFR Parts 59-60. Each NFIP-participating Middlesex County municipality has adopted a flood damage prevention ordinance meeting 44 CFR 60.3 minimum standards, including 1-foot freeboard for residential construction in Zone AE Special Flood Hazard Areas on the Effective FIRM. State layer: the Flood Hazard Area Control Act (N.J.S.A. 58:16A-50 et seq.), implemented at N.J.A.C. 7:13, authorizes NJDEP's Division of Land Use Regulation to delineate flood hazard areas and require Flood Hazard Area Individual Permits or General Permits for regulated activities (filling, grading, construction, vegetation removal) in the floodway, riparian zone, and 500-year flood hazard area. NJ flood standards under N.J.A.C. 7:13 are stricter than federal NFIP minimums in many respects — for example, the state regulates the 500-year (0.2% annual chance) area as well as the 100-year (1% annual chance) area, requires 1-foot freeboard above the Flood Hazard Area Design Flood Elevation, and protects 50- to 300-foot riparian zones along Category One waters. After Hurricane Sandy (Oct 2012), NJDEP adopted emergency and permanent amendments to N.J.A.C. 7:13 raising design standards in coastal and riverine areas. Middlesex County is heavily affected by flood risk: the Raritan River and Lawrence Brook flow through New Brunswick (which has experienced repeated flooding); the Raritan Bay coastline at Perth Amboy, South Amboy, Sayreville, and Old Bridge sustained major damage from Sandy's storm surge; and the FEMA Flood Insurance Study for Middlesex County (preliminary DFIRM dated January 31, 2014, updated by subsequent map revisions) maps AE and VE Special Flood Hazard Areas across these communities. Middlesex County itself does not issue floodplain permits — applicants apply to NJDEP for a Flood Hazard Area permit and to the local municipal floodplain administrator/Construction Official for the local permit.