Health Services

Contact Us

Walter Dawydiak



360 Yaphank Avenue

Yaphank, NY 11980 - Suite 2B

Telephone (631) 852 - 5800

Fax (631) 852 - 5825

Division of Environmental Quality

The Division of Environmental Quality (DEQ) conducts comprehensive programs that protect Suffolk County residents against adverse environmental factors. DEQ programs also preserve and enhance the generally high quality of the Suffolk County environment.

The major programs of the Division of Environmental Quality are groundwater and drinking water protection, wastewater management, toxic and hazardous materials pollution control, monitoring and laboratory analyses, enforcement of regulations, and environmental management studies and programs for groundwater and surface waters, including related ecological issues. These programs are managed through the five offices of the division: Water Resources, Pollution Control, Wastewater Management, Ecology, and the Public and Environmental Health Laboratory.

The Division’s Board of Review hears requests for variances and waivers, meeting on the third Thursday of every month, with the exception of December, when the meeting is on the second Thursday of the month. A listing of each month’s scheduled hearings may be obtained by contacting the division at 852-5800. On alternate Thursdays, voting for previous hearings may be recorded.

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The SCDHS has issued the final report on the Grand Canal Ecological and Public Health Assessment. For the document summary, full report, and appendices, please click on:

suffolk county comprehensive water resources management plan

Click here for the Suffolk Comprehensive Water Resources Management Plan

Click here for GIS Marine Water Quality Data


On December 29, 2017 the Suffolk County Department of Health Services adopted revised Standards for the management and approval of I/A OWTS along with significant revisions to the residential and commercial construction standards, which define the requirements for the design and construction of I/A OWTS. In addition, as of January 19, 2018 SCDHS has certified five (5) I/A OWTS technologies for Provisional Use. Copies of the Sanitary Code, Standards and other useful I/A OWTS documents can be found here:



Suffolk County Department of Health Services (SCDHS) has approved three (3) new sanitary technologies, the NitrexTM System, Aqua Point – Bioclere®, WesTech’s STM-AerotorsTM, as capable of attaining 10 mg/L for total nitrogen for systems between 1,000 gpd and 15,000 gpd.  These systems join the list of previously approved technologies which include, Cromaglass, Biologically Engineered Single Sludge Treatment (BESST), Sequencing Batch Reactor (SBR) and Membrane Biological Reactor (MBR) which qualify for a reduced separation distance of 75 feet under SCDHS standards for systems of 15,000 gallons per day (gpd) or less.    A new sanitary system study is currently in the planning phase to further examine small systems, under 1,000 gpd, with a 50% nitrogen removal criterion.

Please contact us for more information about the individual task summary reports.


In 2012 there were 195 sewage treatment plants (STP) operating in Suffolk County.  These plants are regulated under the terms and conditions of a State Pollution Discharge Elimination System (SPDES) Permit.  In 2012, Suffolk County Department of Health Services (SCDHS) performed inspections of all of the aforementioned STPs under its jurisdiction.    Out of 195 STPs, 168 plants are capable of reducing BOD5 (Biochemical Oxygen Demand), SS (Total Suspended Solids), and N (Total Nitrogen) and are categorized as tertiary plants and 27 plants are capable of reducing BOD5 and SS only and are categorized as secondary plants.   

Please contact us for more information about complete 2012 Performance evaluation report.