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Breadcrumb Start you are here >Home/Sanitary Sewage Collection and Treatment

Sewage Treatment in Nassau County   

Nassau County Sewage CoverageNassau 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 permited capacities of 70 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 3.0 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.

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 ten 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.

The County’s Sewer and Storm Water 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.


July 15, 2014

Federal Emergency Management Agency

Notice of Availability
Environmental Assessment

Bay Park Sewage Treatment Plant Hazard Mitigation -

Floodwall and Berm Construction

{Click on Links to view files}

July 31, 2014


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