Environmental Rules in Smithtown, NY (2026)
5 verified environmental rules for Smithtown, New York, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Smithtown requires a Town-approved stormwater pollution prevention plan before any land development activity gets a permit, and projects disturbing an acre or more (or that hit an impaired waterway) must add post-construction water-quantity and water-quality controls maintained under a recorded easement.
Smithtown Stormwater Management Rules
Significant RestrictionsSmithtown Code § 153-8, § 153-9
No application for a land development activity shall be approved by the appropriate board until a stormwater pollution prevention plan prepared in accordance with the specifications in this chapter has been reviewed and approved by the Stormwater Management Officer. ... Any land development activity shall not cause an increase in turbidity that will result in substantial visible contrast to nat...
Erosion Control
Smithtown caps active soil disturbance at five acres at a time absent an approved plan, requires a qualified professional to inspect erosion and sediment controls every seven days plus after any half-inch storm, and orders sediment removed once traps are half full.
Smithtown Erosion & Sediment Control Rules
Significant RestrictionsSmithtown Code § 153-8(B)(1)(d), § 153-10(A)
Construction phasing plan 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 Erosion Control Manual, not more than five acres shall be disturbed at any one time unless pursuant to an approved SWPPP. .....
Flood Zones
Smithtown requires a floodplain development permit before any construction, filling, grading or other development can proceed in an area of special flood hazard shown on the Town's FEMA flood maps. The Director of Planning administers the permit as local administrator, and applications carry a $2-per-square-foot fee. Building without a permit in a flood zone is unlawful under Chapter 168.
Smithtown Floodplain Development Permit Rules
Some RestrictionsSmithtown Code § 168-12
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 for the purpose of protecting its citizens from increased flood hazards and insuring that new development is constructed in a manner that minimizes its exposure to flooding. It shall be unlawful to undertake any development in an ar...
Boat Dock Permits
Smithtown requires a Town permit before anyone builds, rebuilds, removes or repairs a dock, pier, wharf, bulkhead, dam or impoundment structure over lands underwater. The Conservation Board holds a hearing on a $500 filing fee before the Town Board can approve it.
Smithtown Dock and Bulkhead Permit Rules
Significant RestrictionsSmithtown Code § 138-21
No dam or impoundment structure, including any artificial construction, temporary or permanent, nor any dock, pier, wharf or other structure, temporary or permanent, used as a landing place on waters, nor any bulkhead shall be erected, reconstructed, removed or repaired by any person in or across lands underwater without a permit issued pursuant to Subsection B hereof. B. Permit. A person desir...
Flood Elevation Requirements
In Smithtown's mapped special flood hazard areas, new and substantially improved homes must have their lowest floor raised at least two feet above the base flood elevation. The Director of Planning administers the rule through the floodplain development permit process under Chapter 168.
Smithtown Base Flood Elevation Rules
Some RestrictionsSmithtown Code § 168-24
Within Zones A1-A30, AE and AH, and also Zone A if base flood elevation data are available, new construction and substantial improvements shall have the lowest floor (including basement) elevated to or above two feet above the base flood elevation. Within Zone A, when no base flood elevation data are available, new and substantially improved structures shall have the lowest floor (including bas...
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County ordinances apply to unincorporated areas and may supplement Smithtown city rules.
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