Wastewater Management Program

Sewage Treatment Plants

Nassau County’s two sewage treatment plants process 85% of the sewage collected within the County. These two plants each treat approximately 58 millions of gallons per day (mgd), operating below their respective permitted capacities of 70 mgd and 72 mgd. Recently Nassau County, as part of its consolidation initiative, has assumed responsibility for the operation of the City of Glen Cove’s Water Pollution Control Plant.

This plant is permitted for 5.5 mgd and has been recently upgraded to meet the requirements associated with protecting the Long Island Sound from hypoxia or low dissolved oxygen. This plant currently treats approximately 3 mgd, leaving a surplus capacity of over 2.5 mgd - which could be used to sewer some of the communities in the North Shore that are currently served by cesspools.

View the facilities map (PDF).

Independent Facilities

Ten other independent treatment facilities operate within the county, including City of Long Beach, Jones Beach, Village of Cedarhurst, Village of Lawrence, Village of Great Neck, Port Washington Water Pollution Control District, Belgrave Water Pollution Control District, Great Neck Water Pollution Control District, Greater Atlantic Beach Water Reclamation District, and the Oyster Bay Sewer District. Together, these 10 facilities process 15% of the county’s effluent. Six municipal sewer districts collect sewage and pump it to county facilities to be treated, including the Villages of Garden City, Freeport, Mineola, Hempstead, Roslyn, and Rockville Centre.

Sewer & Stormwater Authority

The county’s sewer and stormwater authority collects and treats most of the sewage generated in the county. As such, the county has an obligation to ensure that its treatment plants operate efficiently, are good neighbors, and protect the environment. To achieve these goals the county initiated a Sewage Treatment Master Plan in the Spring of 2007, which works towards improving operations, reducing odors, enhancing the environment, and saving tax dollars.

Nitrogen Reduction Initiatives

Nassau County is committed to the reduction of nitrogen in our waterways. The levels of nitrogen in Long Island waterways is destructive to the environment, harming both our surface and ground waters. Working with our partners we can turn the tide. Our nitrogen reduction initiatives can be found in the links below.

Regulatory Partnerships/Requirements

  • South Shore Water Reclamation Facility (Agreement DEC Index No: CO 1-20170626-244)
  • Federal Emergency Management Agency (Bay Park Hazard Mitigation)