How to Apply for the Suffolk County Septic Grants, Step by Step

Suffolk County runs both its own Septic Improvement Program and the New York State Septic System Replacement Program, so one application covers both. The catch is the order: the grant has to be awarded before anything is installed. Here is the whole process, from checking eligibility to the final payment, based on the county's 2026 process overview.

Before you start. Have your town tax bill ready, and any proof that your system is failing. Don't let anyone install a system before you have a signed grant agreement and an OK to Proceed. Questions about the grants go to the county at 631-852-5811 or SepticGrants@SuffolkCountyNY.gov. Permit questions go to the Office of Wastewater Management at 631-852-5700.

1. Check that the property qualifies

   The home must be an existing single-family, two-family, or single-family with one accessory apartment. It must use a cesspool or septic system, and it can't be on sewers or inside a proposed sewer district. You also need a valid Certificate of Occupancy, a deed recorded with the Suffolk County Clerk, and property taxes paid up with no liens or foreclosure. New construction on a vacant lot doesn't qualify. The county's eligibility map lets you look up your parcel.

2. Gather your documents

   The county's 2026 process overview says to have these ready before you start:

   • Your current, town-issued property tax bill
   • Proof of a system failure, if you have one, such as photos or pumping receipts

   The county may ask for more once it reviews your file. If a trust, LLC or corporation owns the home, expect to provide extra paperwork.

3. Apply online, before any installation

   The application is on the county's Reclaim Our Water site, ReclaimOurWater.info. One application applies to both the county SIP grant and the New York State SSRP grant. You must apply for and be issued a grant before the I/A system goes in. The county doesn't pay for systems installed first.

4. Wait for scoring and ranking

   Complete applications are scored and funded in order. The county's FAQ lists the priority order:

   1. Catastrophic failures, anywhere in Suffolk County
   2. Non-catastrophic failures, anywhere in the county
   3. Working systems in Priority Critical Areas, meaning within the 0 to 2 year groundwater travel time to surface waters, in groundwater priority area 1, or within 1,000 feet of an enclosed water body
   4. Working systems in Critical Areas, within the 2 to 25 year travel time or groundwater priority area 2
   5. Everything else

   That is why documenting a failure matters. If your cesspool is backing up or collapsing, include photos and service receipts.

5. Sign the grant agreement within 30 days

   If you are awarded a grant, the county emails you a grant agreement covering both the county and state money, along with forms to e-sign. You have 30 days from receipt to sign and return it to the Suffolk County Department of Health Services. You get a copy of the signed agreement back.

6. Hire a design professional and get county approval

   You hire an engineer or architect at your own expense. They prepare the permit application for the county's Office of Wastewater Management and identify any town, village or state permits you need, such as electrical or wetlands permits. The county then issues a Permit to Construct.

   If you are only replacing the cesspool or septic system, your approved installer can apply on your behalf through the county's septic replacement portal. If the replacement is part of an addition or other home change, a full residential application goes to the Office of Wastewater Management instead.

7. Pick an approved installer and submit the quote

   Choose an installer from the county's SIP Approved Installer List. Their price quote has to match the approved permit plans. You sign Assignment of Payment forms so the county can pay the installer, and the county sends a Grant Eligibility Memo based on the quote. This is the step where comparing a few quotes pays off.

8. Installation and county inspection

   Work can start once the installer gets an OK to Proceed. County inspectors visit to check the installation against county and manufacturer standards, and they witness the system start-up. Your design professional submits as-built plans, and the installer submits installation and abandonment certification forms for the new system and the old cesspool. You also submit an Operations and Maintenance Agreement and an I/A registration form from your maintenance provider.

9. Grant payment

   Your installer submits payment vouchers and invoices. Once the county issues its Inspector Certification letter, it pays the county and state grants to the installer named in your Assignment of Payment forms. You pay the installer any balance.

10. Claim a town rebate, if you have one

    In Southampton, East Hampton and Shelter Island, the town has its own application and paperwork. Some towns want you to apply before work starts, and they pay after the county signs off. Start the town application early, alongside the county one.

Rules that stay with the house

• The system must be maintained at least once a year by a licensed service provider, for as long as you own it.
• You can't remove or switch off a grant-funded system without the county's written approval.
• The county acts as the oversight agency for I/A systems under Article 19 of the Sanitary Code, and it checks that maintenance is done.
• You must let the county onto the property for site assessments related to the application.

Common mistakes to avoid

• Installing first. The county SIP grant is not a reimbursement program.
• Hiring an installer who isn't on the approved list. The county can only pay installers on its SIP list.
• Missing the 30-day signing window for the grant agreement.
• Forgetting the permit fees and design. Those are on you under the county grant.
• Skipping town paperwork. East End rebates have their own forms and deadlines.

See also: what it costs and how the grants stack.