S.E.P.T.I.C. Program


Nassau County has initiated a septic system replacement program for residents and small businesses -- Septic Environmental Program to Improve Cleanliness (SEPTIC). The SEPTIC program will provide grant funding to eligible recipients to replace a conventional or failing septic system with an innovative and alternative onsite wastewater treatment system. Nassau County is offering grants up to $20,000 for homeowners or small businesses to install state-of-the-art nitrogen reducing septic systems.

Tens of thousands of homes and small businesses in Nassau County are currently served by cesspools and septic systems. Reversing degradation of water quality will depend on replacement of existing systems with new, individual Innovative and Alternative Onsite Wastewater Treatment Systems (I/A OWTS) designed to remove nitrogen. When properly designed, sited, installed, managed, and maintained, these new septic systems provide a cost-effective and environmentally sound alternative to sewers in areas that are outside designated sewer areas. These systems significantly reduce nitrogen, biochemical oxygen demand and total suspended solids, before being discharged below grade to leaching structures. 

I/A OWTS can provide greater performance reliability and reduce the number of pump outs for homeowners that currently pump out their wastewater systems more than once per year.

Nassau County residents and small businesses that discharge less than 1,000 gallons a day of wastewater are eligible for grants to install these new septic systems. The provisionally approved manufacturers are:  

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

How do the Provisionally Approved Technologies Reduce Nitrogen?

Nitrogen pollution from cesspools and septic systems has been identified as the largest single cause of degraded water quality contributing to beach closures, restrictions on shellfishing, toxic algae blooms, and massive fish kills. A conventional onsite septic system was never designed to remove nitrogen. The average residential septic system discharges approximately 40 pounds of nitrogen per year.

All six of the Provisionally Approved Technologies in Nassau County rely on biological processes to treat wastewater and remove nitrogen. These systems use various methods to provide aerobic bacteria to convert organic nitrogen to nitrite and nitrate and then use an anaerobic (without oxygen) environment to denitrify by stripping the oxygen molecule off of the nitrate nitrogen, resulting in the release of gaseous nitrogen into our atmosphere. The nitrogen cycle is one of Earth’s most important biological process, second to only photosynthesis. 

Septic Improvement Program Grant and Loan Program

Eligibility criteria includes: 

  • Residences must be single family, owner-occupied and a property owner’s primary residence. 
  • The residence/small business must be served by a septic system or cesspool and not connected to a sewer system or located within a proposed sewer district.  
  • Property does not have any outstanding or open real property tax liens. 
  • There must be a valid certificate of occupancy (CO) or equivalent.

For more information, please contact SepticReplace@nassaucountyny.gov or 516-364-5861.