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Clarkstown, NY Environmental Rules: Flood Zones (2026)

Significant Restrictions

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

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

Key Facts

Local administrator: Director of Engineering & Facilities Mgmt.
FEMA community number: 360679
Permit deposit cap: $500 for added review costs
Max fine: $500, up to 15 days jail
Chapter adopted: March 26, 2024 (L.L. No. 4-2024)

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 Clarkstown, NY.

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 Clarkstown, NY on the FEMA flood map

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

Summary

Clarkstown requires a floodplain development permit for any construction, filling or grading in FEMA-mapped special flood hazard areas, administered by the Director of Engineering and Facilities Management.

A floodplain development permit is hereby established for all construction and other development to be undertaken in areas of special flood hazard in this community... It shall be unlawful to undertake any development in an area of special flood hazard, as shown on the Flood Insurance Rate Map enumerated in § 146-4B, without a valid floodplain development permit.

View official code

Full Breakdown

L. No. 4-2024, applies to "all areas of special flood hazard within the jurisdiction of the Town of Clarkstown, Rockland County" under § 146-4A, with those areas identified on FEMA's Flood Insurance Rate Map for Community Number 360679 and the March 3, 2014 Flood Insurance Study, plus several Letter of Map Revision updates through 2024. without a valid floodplain development permit," covering construction, filling, grading, dredging, paving and material storage. Applications under § 146-5C must show proposed elevations relative to mean sea level for the lowest floor of new or improved structures, floodproofing certifications where applicable, and watercourse-alteration data.

Permit applications carry a fee under the Town Board's Consolidated Fee Schedule, and the administrator may require a deposit of up to $500 for added review costs under § 146-5B(2). The local administrator also issues stop-work orders for unpermitted or noncompliant development and issues certificates of compliance before any structure in a flood hazard area may be occupied.

Violations & Fines

Building, altering or filling land in a special flood hazard area without a valid permit, or violating permit conditions, is a violation of § 146-4E. It carries a fine of up to $500 or imprisonment up to 15 days, or both, with each day of noncompliance a separate offense; a noncompliant structure lacking an approved variance is also reported to FEMA.

Frequently Asked Questions

Do I need a permit to build in a Clarkstown flood zone?

Yes. Section 146-5B(1) makes it unlawful to undertake any development, including construction, filling or grading, in an area of special flood hazard shown on the FEMA Flood Insurance Rate Map without a valid floodplain development permit from the Director of Engineering and Facilities Management.

How does Clarkstown define an area of special flood hazard?

Per § 146-3, it is land in the floodplain subject to a 1% or greater chance of flooding in any given year, shown on FEMA maps as Zone A, AE, AH, AO, A1-A30, A99, V, VO, VE or V1-V30, also called the base or 100-year floodplain.

What happens if I build in a Clarkstown flood zone without a permit?

It is a violation under § 146-4E punishable by a fine up to $500 or up to 15 days' imprisonment, or both, with each day of noncompliance a separate offense, and the structure can be reported to FEMA if no variance is obtained.

Sources & Official References

[1]Clarkstown Code § 146-4, § 146-5, Flood Damage Prevention

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