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Digital Geodata Series
DGS02-2 Well Head Protection Areas For Public Community Water Supply Wells In New Jersey.

IMAGE METADATA (7-11-2011)


A Well Head Protection Area (WHPA) in New Jersey is a map area calculated around a Public Community Water Supply (PCWS) well in New Jersey that delineates the horizontal extent of ground water captured by a well pumping at a specific rate over a two-, five-, and twelve-year period of time for confined wells. The area of capture over two-, five-, and twelve-years is defined using line boundaries and polygon areas generated with the ARC/INFO Geographic Information System (GIS). The confined wells have a fifty foot radius delineated around each well serving as the well head protection area to be controlled by the water purveyor in accordance with Safe Drinking Water Regulations (see NJAC 7:10-11.7(b)1). GIS coverages are produced for each PCWS well and for the set of all PCWS wells in each county and the state using the ARC/INFO UNION command on individual coverages. The individual and county coverages are prepared for distribution as uncompressed ARC/INFO export files. The statewide NJWHPA file is prepared for distribution as an ESRI shapefile with metadata and ArcView Legend file, njwhpa.avl.  The export files are combined with parameter-reference files for each county in compressed 'zip' files for delivery over the Internet. WHPA coverages therefore include line and polygon GIS coverage with associated database files and parameter-reference files for data documentation. The documentation files are ASCII text files having the 'txt' file-name extension.

WHPA delineations are conducted in response to the Safe Drinking Water Act Amendments of 1986 and 1996 as part of the Source Water Area Protection Program (SWAP). The delineations are the first step in defining the sources of water to a public supply well. Within these areas, potential contamination will be assessed and appropriate monitoring will be undertaken as subsequent phases of the NJDEP SWAP. WHPA delineation methods are described in "Guidelines for Delineation of Well Head Protection Areas in New Jersey". .

Index Map of Public Community Water Supply Well Head Protection Areas
in New Jersey

Index of Coverages
by County

Sample Image

Download coverages by clicking link(s) below Updated

Map of New Jersey showing WHPA areas

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