Long Island Cesspool Pages

Nassau County Septic Grants

Nassau's grant is smaller than Suffolk's and works differently. It reimburses you after the work is documented, it only covers six named systems, and it comes with a maintenance agreement you keep for as long as the system is in the ground.

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Cesspool, side viewHouseSewer lineCesspool ringSandGroundwater
Cesspool, side viewA cesspool is a precast ring with open sides and no tank in front of it. Heavy waste stays in the ring while the liquid seeps into the sand around it.

The cesspool behind the house in Bayville has been pumped twice since spring, and the company says it is done. You have heard Nassau pays toward a new system. It does, up to $20,000, but only for the right kind of system, on the right kind of property, with the paperwork filed in the right order.

Who can apply

From Nassau’s program pages, an eligible property:

  • is a single-family or two-family home, a nonprofit, or a small business with an existing design flow of 1,000 gallons a day or less
  • is replacing an existing cesspool or septic system with a new nitrogen-reducing system
  • had that system installed after March 1, 2018
  • has a valid certificate of occupancy or existing use from its city, town or village
  • is not connected to a public or private sewer
  • has no outstanding or open property tax liens

A property inside a sewer district that cannot connect because of site constraints may still qualify, if the district documents it. Not sure about your street? Nassau links a Check for Sewer Service lookup from the program page.

The six systems it pays for

Only these are eligible for reimbursement, per the county’s roadmap:

  • Fuji Clean CEN Series
  • Hydro-Action AN Series
  • Norweco HydroKinetic
  • Norweco Singulair TNT
  • Orenco Advantex AX20-RT
  • SeptiTech STAAR

If an installer proposes something else, it will not be reimbursed under this program.

How the money flows

Nassau reimburses. The grant pays installation costs first; anything left over can reimburse some or all of the design cost. The county’s flyer says the funds are not taxable income and no 1099 is issued. NYSDEC’s description of the money is $10,000 of federal American Rescue Plan funds plus $10,000 from the state Septic System Replacement Fund.

The application, step by step

Nassau’s roadmap lays it out:

  1. Apply through the Nassau S.E.P.T.I.C. portal.
  2. The Nassau County Soil and Water Conservation District reviews the application.
  3. Upload four documents before any reimbursement: stamped architectural or engineering drawings submitted to your local building department, that department’s approved permit, the certificate of occupancy or equivalent, and a signed three-year maintenance agreement for the system.
  4. Those documents are due within one year of your original application date.
  5. You have twelve months from the first application to finish the installation, local approvals included.

The maintenance you are signing up for

This is the part people skim. Nassau’s FAQ says these systems need inspection and maintenance at least once a year, that maintenance agreements are required for the life of the system, and that failing to show proof of a contract can mean paying the grant back.

Who can do the work

The county’s flyer requires contractors to hold a Nassau County home improvement license and carry appropriate insurance. Because state law keeps design and installation in separate firms, plan on hiring a designer and an installer. Our license guide shows how to look up the Nassau license.

How it has gone so far

A 2022 paper by the Nassau County Soil and Water Conservation District says the program launched in May 2021 with enough money for 200 grants, and that by September 2022 the average design and installation cost was $24,115. The county’s FAQ now says there is enough county and state money for 403 grants.

Who to contact

Often booked with this

  • Septic tank pumping

    Nitrogen-reducing systems need professional maintenance at least once a year. Suffolk's county grant pays for the first three years of it.

    Get free quotes
  • Septic or cesspool inspection

    Antorino and Sons lists a full cesspool inspection at $300 to $500 (Jan 2026). Next to the price of a new system, it is a small cost for knowing exactly what has failed.

    Get free quotes

Questions people ask

How much is the Nassau County septic grant?

Up to $20,000. NYSDEC describes it as $10,000 in federal American Rescue Plan money plus $10,000 from the state's Septic System Replacement Fund. The county's FAQ says the money goes to installation costs first, and anything left can reimburse design costs.

Is the Nassau septic grant taxable?

The county's program flyer says the funds are not considered taxable income and that recipients will not receive 1099 forms.

Can I apply after my system was already installed?

Yes, if it went in after March 1, 2018. Nassau's FAQ says you may apply retroactively, though applying does not guarantee an award.

How many grants are left?

Nassau's FAQ says there are currently enough county and state funds for 403 grants.

Can one company design and install my system?

No. The county's FAQ says New York State law does not allow the same firm to both design and install these systems.

Sources (7), checked October 2026
  1. Nassau County, Nassau Septic (SEPTIC program home)
  2. Nassau County Department of Public Works, SEPTIC
  3. Nassau County, SEPTIC Application Roadmap
  4. Nassau County, Septic FAQ
  5. Nassau County Executive, S.E.P.T.I.C. program flyer
  6. NYSDEC, State Septic System Replacement Fund Program
  7. Jobin and others, Nassau County's Nitrogen Reducing Septic System Grant, NOWRA (2022)
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