Town Square







A Message from the Supervisor

“Welcome to Islip, the 3rd largest town in New York State, but with an endearing small town feel. We are so proud of our town…our beaches, golf courses, marinas, parks, housing opportunities for all, businesses, industrial parks, healthcare and educational institutions including our own Islip MacArthur Airport that provides many job opportunities. I sincerely hope you find this website helpful.” Angie


Carleton Avenue Sewer Extension

Closures and Detours as of 1/29/2024. Click here.

  • Northbound traffic on Carleton Ave. CLOSED between SMITH and CLAYTON.

Please be advised as construction on the Carleton Avenue Sewer Extension continues, there will be traffic disruptions and intermittent lane closures to both north and southbound traffic. Stay tuned for additional updates as they are made available.

Construction of the Carleton Avenue Sewer Extension in Central Islip will begin in August 2023, and is expected to be completed in November 2024. Once completed, property owners within the sewer extension area will have the opportunity to connect to the new sewer extension.

If you are the owner of one or more single family residential properties, or commercial properties located within the extension area, and have received our letter directing you to the website, please refer to the following information. The approximate location of the sewer connection will be identified along the curb line in the coming months.

These documents must be submitted to the SCDPW, Sewer Permit Office, at 335 Yaphank Ave., Yaphank, NY 11980.

A list of SCDPW Approved Sewer Contractors have been included in each of the application documents linked above. It is suggested that you contact several sewer contractors to secure price quotes.

For questions or concerns, please call 631-595-3903.