Environmental Rules in Clarkstown, NY (2026)
4 verified environmental rules for Clarkstown, New York, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Clarkstown requires a stormwater pollution prevention plan before approving any land development activity disturbing 10,000 square feet or more, under Town Code Chapter 249A, Article II. Violations carry escalating fines and possible jail time.
Clarkstown Stormwater Management Rules
Significant RestrictionsClarkstown Code §§ 249A-22, 249A-25, 249A-26A, 249A-30D(1)
This article shall be applicable to all land development activities as defined in § 249A-25 (Definitions) herein. ... LAND DEVELOPMENT ACTIVITY: Activity including clearing, grading, excavating, soil disturbance or placement of fill that results in land disturbance of equal to or greater than 10,000 square feet of land area. ... A. Stormwater pollution prevention plan requirement. No applicatio...
Erosion Control
Clarkstown's Chapter 249A, Article II caps active construction disturbance at five acres at a time and requires a qualified professional to inspect erosion and sediment control practices at least weekly and after any half-inch storm.
Clarkstown Erosion & Sediment Control Rules
Significant RestrictionsClarkstown Code §§ 249A-26B(4), 249A-28A(2)
Construction phasing plans describing the intended sequence of construction activities, including clearing and grubbing, excavation and grading, utility and infrastructure installation and any other activity at the site that results in soil disturbance. Consistent with the New York Standards and Specifications for Erosion and Sediment Control (Erosion Control Manual), not more than five acres s...
Flood Zones
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.
Clarkstown Floodplain Development Permit
Significant RestrictionsClarkstown Code § 146-5
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.
Flood Elevation Requirements
In Clarkstown's mapped special flood hazard areas, new construction and substantially improved homes must set the lowest floor, including the basement, at least two feet above the base flood elevation. Nonresidential buildings meet the same two-foot freeboard mark or floodproof to it.
Clarkstown Flood Elevation Freeboard Rule
Some RestrictionsClarkstown Code § 146-6C(1)(a)
Within special flood hazard areas, new construction and substantial improvements shall have the lowest floor (including basement) elevated to or above two feet above the base flood elevation.
Looking for Rockland County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Clarkstown city rules.
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