Dewatering permits are required when it is not possible to contain pumped water on site during construction activities (i.e. foundation excavation in shallow groundwater areas, swimming pool installations/liner changes, etc.), or to register residential sump pumps having permanent discharges into the street or Town of Islip drainage systems.

When a dedication of land is proposed to the Town of Islip (e.g.: road widening, recharge basin, conservation area, corner radius), the attached documentation is required prior to the Town Board acceptance of the dedication.

When a dedication is proposed to the Town of Islip for a new public road resulting from a subdivision  or road opening, the attached documentation is required prior to the Town Board acceptance of the dedication.

Creation of a new road or extension of an existing road.

The Department of Planning is pleased to offer the latest version of the Subdivision and Land Development Regulations on the website. This document contains helpful information regarding the Subdivision, Site Plan Review, and Land Clearing process. The document also contains the design submission and improvement standards required by the Engineering Division. The most recent version of these regulations was adopted by the Town Board in 2007. Updates include new requirements for Stormwater Pollution Prevention Plans as mandated by the New York State Department of Environmental Conservation. PLEASE NOTE THAT SOME OF THE APPLICATION FORMS INCLUDED IN THIS BOOK HAVE BEEN MODIFIED AND ARE SUPERCEDED BY THE NEWER FORMS DEPLOYED ON THIS PAGE. If you have any questions, please give our Engineering Division a call at 631-224-5360.