Somerset County Office of GIS ServicesThe GIS dataset represents the Assigned Sewer Service Areas associated with Wastewater Treatment Facilities that discharge to surface and ground water established pursuant to N.J.A.C. 7:15-4.4. Assigned Sewer Service Areas are defined as the eligible sewer service area from which sewage flows are conveyed to a specific wastewater treatment facility (WWTF). For the purposes of the wastewater treatment plant capacity analysis which is a required component of areawide Wastewater Management Plans, the Assigned Sewer Service Area is the area reasonably expected to generate sewage that will be conveyed to the WWTF or to an industrial treatment works that accepts sewage generated from areas other than the industrial facility according to N.J.A.C. 7:15-1.5. The original GIS dataset and map was approved by the Somerset County Board of Chosen Freeholders as the first phase in the development of the countywide wastewater management plan and authorized their submission to NJDEP for consideration as an amendment to the Upper Raritan, Northeast and Lower Raritan/Middlesex County Water Quality Management Plans (WQMP) on February 28, 2012 via Resolution No. R12-015. On January 24, 2013, NJDEP adopted the dataset and map as an amendment to the Upper Raritan and Northeast WQMP, and on March 5, 2013, NJDEP adopted the dataset and map as an amendment to the Lower Raritan/Middlesex County WQMP. On November 4, 2019 the NJDEP adopted the Montgomery Township and Rocky Hill Borough Component of the Somerset County WMP that includes the dataset and map, Wastewater Treatment Plant Capacity Analysis and Strategies to Mitigate Wastewater Treatment Capacity Deficiencies pertaining to Assigned Sewer Service Areas within these two (2) municipalities. Since this time, the countywide dataset and map have been updated to reflect the terminology changes contained in the WQMP Rules (N.J.A.C.7:15). For example, "Future Wastewater Service Areas Discharging to Surface Water and Ground Water are now referred to as "Assigned Sewer Service Areas". The dataset and map adopted by NJDEP in 2013 was further updated to reflect the site-specific revisions and amendments that were adopted by the NJDEP since that time. The dataset and map also incorporates wastewater flow transfers that have taken place in Montgomery Township and that were approved at the local level in Warren Township and Watchung Borough. The dataset and map also reflect the anticipated discontinuation/closure of certain existing permitted category GW and T1 WWTFs for which sewer service areas have been assigned and that are also located within the Assigned Sewer Service Areas of WWTFs that discharge to surface water. Redevelopment and/or expansion of the existing development at these sites is anticipated in the future, at which time the on-site groundwater discharge facilities will be connected to the WWTF systems that discharge to surface water. It is important to note that this dataset and map do not include any expansions of the Assigned Sewer Service Areas adopted by NJDEP in 2013 other than the NJDEP-adopted site specific amendments and revisions that took place since 2013. Areas within Somerset County are included in the following Water Quality Management Planning (WQMP) Areas: 1) Upper Raritan Areawide WQMP Area, 2) Northeast WQMP Area and 3) the Lower Raritan/Middlesex County WQMP Area. As noted in N.J.S.A. 7:15-2.3, "Areawide Water Quality Management Plans (WQMP) identify and address selected water quality and wastewater management issues for a particular jurisdictional area, including strategies to address both point and nonpoint source pollution. The areawide WQMP is the basis by which the NJDEP and the designated planning agencies (DPAs) conduct selected water quality management planning activities for a particular area of the State. The aforementioned WQMP areas represent three (3) of the twelve (12) areawide WQMPs which together cover the entire State of New Jersey that were established pursuant to Sections 208 and 303 of the Clean Water Act. Areawide WQMP include the WMPs, TMDLs, and other water quality improvement and wastewater related plans as determined appropriate by the DPA and the NJDEP". The dataset and map are components of the Somerset County Wastewater Management Plan (WMP). The Somerset County WMP constitutes a portion of the Upper Raritan, Northeast and Lower Raritan/Middlesex County Water Quality Management Plans (WQMP).ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a0258676b676464ea17aac07ac8d3818_0engNew Jersey Geographic Information Network (NJGIN) Open Data PortalPublicSomerset County Sewer Service Areas [New Jersey]Web servicesNew JerseyLast Modified: 2025-11-19