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Innovative/Alternative Onsite Wastewater Treatment System
New Construction Grant Assistance Program (IA GAP)

Click here to begin the process and submit your application for the New Construction IA GAP.

On November 16, 2021, the Suffolk County Legislature approved the creation of the temporary New Construction IA GAP. Effective July 1, 2021, Developers of new single family residences may apply for up to $20,000 toward the design, purchase, and installation of an Innovative/Alternative Onsite Wastewater Treatment System (I/A OWTS).

Click here to review the program Rules and Regulations.

Please note:

Submission of an application does not guarantee an award of a grant. The County reserves the right to change the terms and conditions of the New Construction IA GAP at any time. This program is highly competitive and applications will be prioritized by project status and other eligibility requirements and will also be based upon the availability of funding.

If you have questions, please send an email to

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