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Suffolk County Septic Grant (2026): Amounts, Eligibility & Rules

Last reviewed October 17, 2026 · Official sources linked throughout

Suffolk County homeowners replacing a cesspool or septic system with a nitrogen-reducing I/A system can apply for two grants at once: the county's Septic Improvement Program (SIP) and New York State's Septic System Replacement Program (SSRP). Here's what the official sources say as of October 17, 2026.

Up to $20,000Suffolk County SIP grant per property, depending on whether your project qualifies [county]
Up to $25,000NY State SSRP: up to 75% of program-eligible costs, capped at $25,000 per property [county]
Up to $45,000combined state + county, per the county's 2026 flyer [flyer]
$25,688median county-published base price, 4-bedroom home reusing existing leaching (excludes engineering, permits, sales tax) [cost ranking]

How much is the Suffolk County septic grant?

The county's septic grants page says the County Septic Improvement Grant Program "provides installation grants up to $20,000 per property depending upon whether your project qualifies." [source] The 2026 grant process overview lists the county SIP as a "$20,000 Grant." [source]

The NYS DEC and EFC pages describe the county program's structure in more detail: a $10,000 base grant, plus up to $5,000 more when a pressurized shallow drainfield is installed and up to $5,000 more for low-to-moderate income applicants. [DEC] [EFC] Those state pages may lag behind the county's own materials, so to be conservative, plan on the $10,000 base and treat the rest as possible until the county confirms your award.

How much is the New York State grant?

Per the county, the NYS SSRP "provides installation grants or reimbursements up to 75% of the program eligible costs not to exceed $25,000 per property depending upon whether your project qualifies." [source] The state's program outline sets two tiers: 50% of eligible costs up to $10,000 for conventional septic projects, or 75% up to $25,000 for "Enhanced" systems designed to reduce total nitrogen to 19 mg/L. [state outline] Suffolk's I/A standards limit total nitrogen to an average of 19 mg/L. [county] More in our state grant guide.

Who qualifies?

At a minimum, according to the county, your property must: [source]

New construction on a vacant lot is not eligible, and the existing system must be abandoned and replaced with the I/A system. [source]

Who gets funded first?

Applications with a documented system failure are prioritized before all others, then properties in priority areas. See priority areas explained. [source]

What the grants don't cover

The county's vendor cost documents say grant funds can't be used for: [county]

Permitting, engineering and design, post-installation landscaping, permit application fees and maintenance are the property owner's responsibility. Annual professional maintenance is required; the county SIP grant funds the initial 3-year period after installation. [source]

How the money is paid

The county grant is not a reimbursement: funds are paid directly to your approved installer after installation is complete. The state grant can be paid to the installer or reimbursed to the owner, also after installation. [source]

Extra town money on the East End

Property owners in East Hampton, Shelter Island and Southampton may be eligible for additional town funding. [source]

The DEC page also mentions low-interest loans of up to $10,000 through the Community Development Corporation of Long Island. [DEC]

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Independent guide. Not affiliated with, endorsed by, or operated by Suffolk County, New York State, or any installer. This page is general information, not legal or financial advice.

Sources

Last reviewed October 17, 2026. Program rules change; always confirm with Suffolk County Department of Health Services (631-852-5811, [email protected]).