What cesspool and septic work costs on Long Island

What public data can and cannot tell you

No government agency publishes a price list for cesspool and septic work on Long Island, and vendor price ranges are not facts. What public data does show is what the labor costs, what the towns charge for permits, and what grants exist. The price for your job comes from licensed pros' written estimates after they see it.

What the trade earns on Long Island

Annual pay from the New York State Department of Labor, updated to the first quarter of 2026. Entry level is the average of the lowest third of wages; experienced is the average of the top two thirds.

What the towns charge

• City of Glen Cove: Sanitary cesspools or septic tanks carry a $200.00 fee on the City's schedule.

Grants and programs

• New York's State Septic System Replacement Fund can reimburse property owners up to 50% of the eligible costs of a septic system project, with no more than $10,000 paid per property.
• Enhanced septic system projects can be reimbursed up to 75% of eligible costs, to a cap of $25,000 per property. That higher tier covers only systems with Residential General Use or Provisional Use Approval on Suffolk County's Article 19 I/A list.
• In Nassau and Suffolk Counties, state replacement funding is open only to septic systems that achieve 19 mg/L of total nitrogen in effluent.
• On Long Island, the state fund's priority areas are the ones identified in the Nassau County and Suffolk County Nine Element Plans, and a system in an existing or planned sewage collection area cannot qualify.
• Under the state program, eligible properties are single or two-family homes and small businesses with an existing design sewage flow up to 1,000 gallons per day. The fund excludes new construction.
• Owners apply to their county for the state money, which reaches counties on a reimbursement basis, so the property owner is initially responsible for the project's total cost.
• Official pages give different amounts for Suffolk County's Septic Improvement Program grant. The county's own program page says it provides installation grants of up to $20,000 per property, depending on whether the project qualifies.
• The state Environmental Facilities Corporation describes the Suffolk grant differently: a base of up to $10,000, plus up to $10,000 more for a pressurized shallow drain field ($5,000), for eligible low to moderate income applicants ($5,000), or both.
• Suffolk's septic grants page says owners in the Towns of East Hampton, Shelter Island and Southampton may be eligible for additional funding to replace an existing septic system with an I/A system.
• Suffolk's grant requires an existing single-family home, two-family home or single-family home with one accessory apartment, served by a cesspool or septic system and not connected to sewers or inside a proposed sewer area.
• For Suffolk's grant, the property needs a valid certificate of occupancy, a current town-issued tax bill, current property taxes with no liens or foreclosure, and a deed on file with the Suffolk County Clerk.
• One application through the Septic Improvement Program website applies for both the county and state grants. New construction is excluded, but construction projects at existing residences may be eligible.
• The county's online Septic Improvement Program lookup lets an owner enter an address to see whether the property is eligible to apply.
• Suffolk grant applications with a documented system failure are prioritized ahead of all others, and every applicant needs the county's Office of Wastewater Management to approve the proposed I/A installation before a grant is awarded.
• Suffolk's grant is not a reimbursement. Funds go straight to an approved installer after installation is complete, and only vendors on the Suffolk County Approved Installer List may install grant-funded systems.
• Under Suffolk's grant, all permit application fees stay the homeowner's responsibility and are not eligible costs.
• Suffolk requires annual professional maintenance of a grant-funded system, and the SIP grant funds the initial 3-year period after installation.
• The state's septic fund page also lists Suffolk County low interest loans of up to $10,000.
• Suffolk's grant line is 631-852-5811 or SepticGrants@SuffolkCountyNY.gov, and the Office of Wastewater Management takes permitting questions at 631-852-5700 or HealthWWM@suffolkcountyny.gov.
• Since July 1, 2019, Suffolk homeowners can no longer replace a cesspool with another cesspool, and a conventional septic system is the minimum.
• Under Suffolk's Sanitary Code Article 6, construction applications submitted on or after July 1, 2021 must include an I/A system when the project is a new or expanded single-family home or a major reconstruction.
• Article 6 treats work costing more than 50 percent of the existing structure's market value as a major reconstruction, and bedrooms added beyond the number previously approved make a home an expanded residence.
• An existing single-family home is exempt from Article 6's I/A requirement when the work is not a major reconstruction, square footage and footprint stay the same, and bedrooms total no more than five. Adding bedrooms always calls for at least a conforming conventional septic system.
• Article 19 of Suffolk's Sanitary Code has the county health department oversee the installation, maintenance and operation of every I/A system, and each property owner must register a new I/A system before construction.
• County pages disagree on how many Suffolk homes rely on cesspools and septic systems. The county's septic grants page puts the share at nearly 70% of homes.
• Suffolk's July 2020 Subwatersheds Wastewater Plan prints a different share: 74 percent of county residences rely on onsite sewage disposal systems.
• The county's October 2012 sewer district map sheets warn that they are not an official boundary map and name the operating agencies as the source for any final determination on a specific tax map parcel.
• The county Department of Public Works' Division of Sanitation operates and maintains 27 county-owned sewer districts; its Sewer Permits Office is at (631) 854-4185 and its main office at (631) 852-4188.
• Nassau County offers homeowners or small businesses up to $20,000 in grants to install nitrogen-reducing septic systems. Tens of thousands of Nassau homes and small businesses are currently served by cesspools and septic systems.
• Nassau's grant pairs $10,000 of federal funds with $10,000 in State Septic System Replacement Grant funds, according to the state's Environmental Facilities Corporation.
• Nassau's grant may go to single-family and two-family homes, not-for-profits and small businesses whose existing sanitary design flow is 1,000 gallons per day or less, for an I/A system installed after March 1, 2018.
• A Nassau property in the program must hold a valid certificate of occupancy or existing use, cannot be sewered or inside an existing or proposed sewer district, and must carry no outstanding or open real property tax liens.
• Nassau's FAQ says county and state funds were enough for 403 grants as of 2024, and provisional acceptance goes to qualified applicants first-come, first-served.
• Nassau's roadmap gives applicants twelve months from the initial application to complete the I/A installation and all local approvals, and it lists stamped drawings, an approved local building permit and a certificate of occupancy or equivalent among the required documents.
• Nassau's program needs a design professional (a licensed engineer or architect) and an installer, and New York State law bars one firm from doing both. The grant includes a three-year maintenance agreement in the installation contract.
• For a sewer service check, Nassau's septic page links to the county Land Records Viewer, which gives access to almost all information the Department of Assessment maintains.
• Questions about Nassau's septic grant go to SepticReplace@nassaucountyny.gov or 516-364-5861.
• The Town of Huntington, working with the Suffolk County Department of Health Services, encourages eligible residents to apply for a grant through the county's Septic Improvement Program.
• Huntington's page gives the county grant as up to $10,000 toward buying and installing a county-approved I/A system, an amount that differs from what the county itself publishes.
• The Town of Southampton's septic rebate pays a base of up to $20,000 plus, if approved, a $5,000 low to moderate income incentive, for a maximum rebate of $25,000.
• Southampton's FAQ names owners of property in a Priority Area of the Water Quality Improvement Project Plan, and owners replacing an existing sanitary system with an I/A system, as eligible. Owners outside a priority area with a collapsing system may also be eligible.
• Southampton issues rebates after the work is completed, once a complete packet goes to the Community Preservation Department, and a rebate must be processed within 1 year of the county issuing its Final Green Stamped Plans.
• The final Southampton rebate depends on total eligible costs and other grants received, and it does not cover expediting fees or landscaping fees unrelated to restoring the property to its earlier condition.
• To apply for Southampton's rebate, an owner completes the application and a W-9 form and returns them to the office by mail or email; the office's phone is 631-287-5720 and its email septicrebate@Southamptontownny.gov.
• Through its Septic Incentive Program, the Town of East Hampton has funding to encourage the voluntary upgrade of standard sanitary systems to low-nitrogen sanitary systems.
• Of about 19,400 developed parcels in the Town of East Hampton, more than 12,500 are on cesspools and 6,700 use traditional leach field systems, the town's Septic Incentive Program page says.
• East Hampton's septic program contact is septicrebate@ehamptonny.gov or 631-324-0496.
• Shelter Island applicants fill out the town's Eligibility Verification / Conditional Commitment Application and submit it with documentation to the WQI Advisory Board, which evaluates it and makes a recommendation to the Town Board.
• Shelter Island's 2017 law opens the rebate to all owners of residential property in the town and treats the Suffolk County rebate as the primary rebate, paying up to the county's authorized maximum.
• Shelter Island's own documents give different rebate figures. The first, a Town Board resolution adopted on November 17, 2017 alongside the town's septic rebate law, set the rebate at up to $15,000.
• Shelter Island's later funding policy, dated August 1, 2023, names a different limit, a base grant of at most $12,000 per project.
• Suffolk's septic grants page lists (631) 749-0758 as the Town of Shelter Island's rebate contact.

What moves the price

Cesspool and septic prices turn on whether the job is pumping, repair or replacement, the system type the county requires, the lot and soil, and how much of the cost a grant covers.

How to compare estimates

• Give every company the same scope, in writing, so the prices compare.
• Check what each estimate includes: permits, disposal, patching, cleanup and warranties.
• Ask how changes are priced once work starts.
• Never pay most of the price up front.