Jersey City, NJ Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Elevation rule
- Lowest floor at/above base flood elevation
- Applies to
- New construction + substantial improvement, residential
- AO zone default
- 2 ft above highest adjacent grade if unlisted
- Legal basis
- FIS Aug. 16, 2006 / adopted FIRM
- Reviewing official
- Construction Official (§ 172-4.3)
- Penalty
- Up to $2,000 / 90 days (§ 1-25)
Summary
New construction and substantial improvements to residential structures in Jersey City's special flood hazard areas must have their lowest floor, basement included, built to or above base flood elevation. In AO zones with no listed depth number, § 172-5.2.A(2) sets a default two-foot minimum above the highest adjacent grade.
In all areas of special flood hazards where base flood elevation data have been provided as set forth in § 172-3.2 Basis for establishing areas of special flood hazard or in § 172-4.3B Use of other base flood and floodway data, the following standards are required: A.Residential construction.(1)New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation.(2)Within any AO zone on the municipality's FIRM, it is required that all new construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated above the highest adjacent grade at least as high as the depth number specified in feet (at least two feet if no depth number is specified).
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 52).
Full Breakdown
2. ' For lots mapped in an AO zone, subsection A(2) instead measures from the highest adjacent grade, requiring elevation 'at least as high as the depth number specified in feet (at least two feet if no depth number is specified),' with adequate drainage paths required around the structure. 1, which require all new construction and substantial improvements to be anchored against flotation, collapse or lateral movement and built with flood-resistant materials and methods. 4-3.
Violations & Fines
Failing to elevate the lowest floor to base flood elevation is enforced the same way as any other Chapter 172 violation: § 172-3.3 makes noncompliant construction unlawful and subjects the owner to the general penalty at § 1-25, up to a $2,000 fine and/or 90 days of imprisonment or community service, with each continuing violation treated as a separate offense.
Frequently Asked Questions
How high must a new house be built in a Jersey City flood zone?
What if my lot is in an AO zone with no depth number shown?
Does Jersey City require extra freeboard above base flood elevation?
Who reviews my foundation plans for elevation compliance?
Sources & Official References
Other rules in Jersey City
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