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Subdivision Permits

Have Questions? We have answers! Send us an email at or
call the Office of Wastewater Management to schedule a meeting with one of our staff to discuss your proposed project at (631) 852-5700

If you are proposing to split an existing tax lot or lots into two (2) or more identifiable tax lots, proposing to create lease parcels, or simply want to modifying lot lines between existing tax parcels, you may need Department of Health Services Office of Wastewater Management approval to confirm the proposed or modified lots will meet the requirements of Suffolk County's Sanitary Code with respect to sewage disposal system and water supply requirements.

This site contains important information regarding this process including applications, instructions, standards and guidelines to assist the applicant in completing the application process. Remember, submission of a complete application and subdivision/development map will result in a faster approval process.

Applications for Realty Subdivisions or Development Maps

Permit Applications for Sanitary System or Water Supply Upgrades

Additional Information for Approval

Suffolk County Government

H. Lee Dennison Bldg

100 Veterans Memorial Hwy
P.O. Box 6100
Hauppauge, NY 11788

Riverhead County Center

County Road 51
Riverhead, NY 11901