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Sussex County, DE Environmental Rules: Flood Zones (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

FEMA flood zone rules in Sussex County, DE, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.

Key Facts

Enforcing office: Sussex County Environmental Manager (Floodplain Administrator)
NFIP entry date: October 6, 1976
FIRM/FIS date: March 16, 2015
Permit expiration: 180 days if construction not started
Max fine per violation: $100 per day, Ch. 115
Variance body: Sussex County Board of Adjustment

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Sussex County, DE.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Sussex County, DE on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

Sussex County requires a floodplain development permit before any construction, filling, grading, subdivision or utility work in a FEMA-mapped special flood hazard area. The Environmental Manager, acting as Floodplain Administrator, reviews and issues these permits under Chapter 115, Article XVIII.

These county ordinances apply to unincorporated areas of Sussex County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

As of the date of adoption of this amendment... it shall be unlawful for any person or entity to begin construction or other development which is wholly within, partially within, or in contact with any identified special flood hazard area... including but not limited to: subdivision of land, filling, grading, or other site improvements and utility installations; construction, alteration, remodeling, improvement, replacement, reconstruction, repair, relocation, or expansion of any building or structure... until a permit is obtained from Sussex County.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4401089; v17 updated 2025-06-17; through 06-17-2025).

Full Breakdown

11) governs every FEMA-designated special flood hazard area shown on the county's Flood Insurance Rate Map and Flood Insurance Study, both dated March 16, 2015. 3C makes it unlawful to begin any development, including subdivision of land, filling, grading, site improvements, utility installation, building construction or alteration, placement of a manufactured home, or watercourse alteration, in a mapped flood hazard area without first obtaining a permit. 3D. 3E(3). 5E(1) bars encroachments, including fill and new construction, unless a professional engineer registered in Delaware demonstrates through hydrologic and hydraulic analysis that the work will not raise flood levels during the base flood, with that data submitted to both the Floodplain Administrator and FEMA. 4E(1). 7A(3).

Violations & Fines

Failure to obtain a required floodplain development permit, or building contrary to an approved plan, is a violation of Chapter 115 handled under the Article XXVIII enforcement procedure. Section 115-229 makes any violation of Chapter 115 a misdemeanor punishable by a fine of not more than $100, with each day the violation continues treated as a separate offense; owners, builders, contractors and agents who assist in the violation are each separately liable.

Frequently Asked Questions

Do I need a permit to fill or grade land in a Sussex County flood zone?

Yes. Section 115-141.3C makes it unlawful to fill, grade, subdivide or otherwise develop land within a FEMA-mapped special flood hazard area without a permit from the Floodplain Administrator, and disposal of fill debris such as rubble or trash in these areas is barred outright.

Who administers Sussex County's flood zone rules?

The Sussex County Environmental Manager serves as the Floodplain Administrator under Section 115-141.3A, reviewing permit applications, interpreting flood boundaries, inspecting construction and maintaining records of flood zone determinations and enforcement actions.

Can I get a variance from Sussex County's floodplain rules?

The Board of Adjustment may grant one under Section 115-141.7, but only on a showing tied to the physical characteristics of the lot; increased cost or inconvenience of compliance is explicitly not sufficient grounds under Section 115-141.7A(3)(a)[3].

Sources & Official References

[1]Sussex County Code Section 115-141.1 et seq., Article XVIII Flood-Prone Districts (eCode360)

Other rules in Sussex County

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All Sussex County rules

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