{1D329CAA-31BB-496B-B0DF-23CBDA27E3AD}US Environmental Protection Agency20200801U.S. EPA Office of Water (OW)Washington, D.C.EPA Sole Source Aquifershttps://edg.epa.gov/data/public/OW/EPA_Sole_Source_Aquifers.ziphttps://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/SoleSourceAquifers/FeatureServerhttps://www.epa.gov/dwssaInformation on sole source aquifers (SSAs) is widely used in assessments under the National Environmental Policy Act and at the state and local level. A national layer, including all available SSA coverages, is available for use in GIS. This layer includes the GIS polygons for SSAs. In addition to single SSA designated area polygons, some EPA regional offices have delineated GIS layers for:
* Streamflow zones
* Aquifer recharge areas
* Other features at the land surface important for SSA designations.
The SSA geospatial data set is available through Data.gov for use by government agencies, private organizations, and the public.The SSA protection program is authorized by section 1424(e) of the Safe Drinking Water Act of 1974 (Public Law 93-523, 42 U.S.C. 300 et seq.). This program is designed to protect drinking water supplies in areas with few or no alternative sources to the ground water resource, and where, if contamination occurred, using an alternative source would be extremely expensive. EPA defines a sole or principal source aquifer as an aquifer that supplies at least 50 percent of the drinking water consumed in the area overlying the aquifer. These areas may have no alternative drinking water source(s) that could physically, legally and economically supply all those who depend on the aquifer for drinking water. For convenience, all designated sole or principal source aquifers are referred to as "sole source aquifers" (SSAs). The designation protects an area's ground water resource by requiring EPA to review certain proposed projects within the designated area. All proposed projects receiving federal funds are subject to review to ensure that they do not endanger the water source.Publication date20180928As needed-138.21454852-12.6815164561.71101576.65223303U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, DC, National Institute of Standards and Technology. United States ISO 19115 Topic CategoryInland WatersNoneUnited StatesEPA GIS Keyword ThesaurusDrinking WaterWaterUserNone.None.http://project-open-data.github.io/schema/#accessLevelpublicStandard Technical ControlsU.S. Environmental Protection Agency, Office of WaterSafe Drinking Water HotlineIT Specialistmailing and physical address1200 Pennsylvania Avenue, N.W.WashingtonDC20460202-564-1534safewater@epa.govNot presently availablePositional accuracy for the data set varies for individual features within the data set. Actual horizontal positional accuracy for the data set is unknown.Statements of vertical positional accuracy for elevation of water surfaces are based on accuracy statements made for USGS topographic quadrangle maps. These maps were compiled to meet National Map Accuracy Standards. For vertical accuracy, this standard is met if at least 90 percent of well-defined points tested are within one-half contour interval of the correct value. Elevations of water surface printed on the published map meet this standard; the contour intervals of the maps vary. These elevations were transcribed into the digital data; the accuracy of this transcription was checked by visual comparison between the data and the map.
For more information, see the National Hydrography Dataset Concepts and Contents document (February 2000) available at <http://nhd.usgs.gov/chapter1/index.html>.Not presently available20110317GIS coverages for SSA's were obtained from EPA Regions 1, 2, 3, 4, 5, 6, 8, 9, and 10 for a baseline period through September, 2009. GIS materials are not available at this time for the St. Joseph SSA in Indiana [53 FR 23682 (1988)]. Each SSA polygon was checked against the Federal Register (FR) determination for that SSA. In some instances, SSAs can extend across stateliness and can also be included in more than a single EPA region. There are 84 GIS polygons for the Sole Source Aquifers, since in addition to a single SSA designated area polygons, some Regions have delineated GIS layers for streamflow zones, aquifer recharge areas, and other features at the land surface important for the SSA designations. The SSA_IDs, SSA names and Federal Register citations used for this national seamless SAA GIS layer include the following polygons:
SSA01 Block Island Aquifer 49 FR 2958 (1984);
SSA02 Broad Brook Basin/Barnes Aquifer 60 FR 20989 (1995);
SSA03 Canoe River Aquifer 58 FR 28402 (1993);
SSA04 Cape Cod Aquifer 47 FR 30282 (1982);
SSA05 Head Of The Neponset Aquifer 53 FR 49920 (1988);
SSA06 Hunt_Annaquatucket/Pettaquamscutt Aquifer 53 FR 19026 (1988);
SSA07 Isleboro Island Aquifer 64 FR 51972 (1999);
SSA08 Marthas Vineyard Aquifer 53 FR 3451 (1988)
SSA09 Monhegan Island Aquifer 53 FR 24496 (1988);
SSA10 Nantucket Aquifer 49 FR 2952 (1984);
SSA11 North Haven Island Aquifer 54 FR 29934 (1989);
SSA12 Pawcatuck River Aquifer 53 FR 17108 (1988);
SSA13 Plymouth/Carver Aquifer 55 FR 32137 (1990);
SSA14 Pootatuck Aquifer 55 FR 11055 (1990);
SSA15 Vinalhaven Island Aquifer 54 FR 29779 (1989);
SSA78 Conanicut Island Aquifer 73 FR 47599 (2008);
SSA27 Schenectady-Niskayuna SSA 50 FR 2022 (1985);
SSA28 Upper Rockaway River Basin SSA 49 FR 2946 (1984);
SSA26 Ridgewood Area Aquifers SSA 49 FR 2943 (1984);
SSA25 Ramapo River Basin Aquifer Systems SSA 57 FR 39201 (1992)
SSA23a New Jersey Coastal Plain Aquifer System SSA 53 FR 23791 (1988);
SSA22 Nassau/Suffolk Counties Long Island SSA 43 FR 2661 (1978);
SSA20 Highlands Aquifer System Passaic, Morris & Essex Counties, NJ SSA 52 FR 37213 (1987);
SSA19 Cortland-Home-Preble Aquifer System SSA 53 FR 22045 (1988);
SSA18 Clinton Street-Ballpark Valley Aquifer SSA 50 FR 2025 (1985);
SSA17 Cattaraugus Creek Basin Aquifer SSA 52 FR 36100 (1987);
SSA16 Buried Valley Aquifers, Central Basin, Essex and Morris Counties SSA 45 FR 30537 (1980);
SSA21 Kings/Queens Counties (Brooklyn-Queens) Aquifer System SSA 49 FR 2950 (1984);
SSA24 New Jersey Fifteen Basin Aquifers SSA 53 FR 23685 (1988);
SSA77 Northern Tug Hill Glacial Aquifer SSA 71 FR 64524 (2006);
SSA29 Columbia and Yorktown-Eastover Multi-aquifer System 62 FR 17187 (1997);
SSA30 Piedmont (Maryland Piedmont) Aquifer Montgomery, Howard, Caroll Counties SSA 45 FR 57165 (1980);
SSA31 Poolesville Area Aquifer Extension of the Maryland Piedmont Aquifer SSA 63 FR 6176 (1998);
SSA32 Prospect Hill Aquifer, Clark County SSA 2 FR 21733 (1987);
SSA33 Seven Valleys Aquifer, York County SSA 50 FR 9126 (1985);
SSA23b Delaware River Streamflow Zone/New Jersey Coastal Plains Aquifer SSA 53 FR 23791 (1988);
SSA36 Volusia-Floridan Aquifer SSA 52 FR 44211 (1987);
SSA35 Southern Hills Regional Aquifer System SSA 53 FR 25538 (1988);
SSA34a Biscayne Aquifer SSA 44 FR 58797 (1979);
SSA34b Biscayne Aquifer SSA Streamflow and Recharge Source Zones44 FR 58797 (1979);
SSA40 Mille Lacs Sole Source Aquifer SSA 55 FR 43407 (1990);
SSA42 Pleasant City Aquifer, Ohio SSA 52 FR 32342 (1987);
SSA38 Bass Islands Aquifer, Catawba Island, Ohio SSA 52 FR 37009 (1987);
SSA37 Allen County Area Combined Aquifer System, Ohio SSA 57 FR 53111 (1992);
SSA39_SSA41 Greater Miami Buried Aquifer & OKI Extension (Southern Portion) SSA 57 FR 2567 and 15876 (1988);
SSA44a Arbuckle-Simpson Aquifer SSA - Streamflow Source Area 54 FR 39230 (1989);
SSA44b Arbuckle-Simpson Aquifer SSA - Recharge Zone 54 FR 39230 (1989);
SSA45 Chicot Aquifer System SSA 53 FR 20893 (1988);
SSA47a Edwards Aquifer I (San Antonio Area) SSA - Streamflow Source Area 40 FR 58344 (1975);
SSA47b Edwards Aquifer I (San Antonio Area) SSA - Recharge Zone 40 FR 58344 (1975);
SSA46a Edwards Aquifer II (Austin Area) SSA - Streamflow Source Zone 53 FR 20897 (1988);
SSA46b Edwards Aquifer II (Austin Area) SSA -Recharge Zone 53 FR 20897 (1988);
SSA46c Edwards Aquifer II (Austin Area) SSA - Artesian Zone 53 FR 20897 (1988);
SSA79 Espanola Basin Aquifer System SSA 73 FR 3723 (2008);
SSA51 Missoula Valley Aquifer SSA 53 FR 20895 (1988);
SSA74 Glen Canyon - Moab, Utah Aquifer System SSA 67 FR 736 (2002);
SSA50 Elk Mountain Aquifer SSA 63 FR 38167 (1998);
SSA48 Castle Valley Aquifer System SSA 66 FR 41027 (2001);
SSA48 Castle Valley Aquifer System SSA 66 FR 41027 (2001);
SSA52 Western Unita Arch Paleozoic Aquifer System at Oakley, Utah SSA 65 FR 232 (2000);
SSA59 Santa Margarita Aquifer, Scotts Valley SSA 50 FR 2023 (1985);
SSA55a Fresno County Aquifer SSA 44 FR 52751 (1979);
SSA55b Fresno Streamflow Source Zone 44 FR 52751 (1979);
SSA61 Upper Santa Cruz & Avra Basin SSA 49 FR 2948 (1984);
SSA54 Campo/Cottonwood Creek Aquifer SSA 58 FR 31024 (1993);
SSA58 Ocotillo-Coyote Wells SSA 61 FR 47752 (1996);
SSA53 Bisbee-Naco SSA 53 FR 38337 (1988);
SSA57a Northern Guam Aquifer System Recharge Area SSA 43 FR 17867 (1978);
SSA57b Northern Guam Aquifer System Streamflow Source Zone SSA 43 FR 17867 (1978);
SSA56 Molokai Aquifer SSA 59 FR 23063 (1993);
SSA60 Southern Oahu Basal Aquifer SSA 52 FR 45496 (1987);
SSA49a Eastern Snake River Plain Aquifer Area SSA 56 FR 50634 (1991);
SSA49b Eastern Snake River Plain Aquifer Source Area SSA 56 FR 50634 (1991);
SSA62 Camano Island Aquifer Area SSA 47 FR 14799 (1982);
SSA63a Cedar Valley Aquifer Area SSA 53 FR 38799 (1988);
SSA63b Cedar Valley Aquifer Source Area SSA 53 FR 38799 (1988);
SSA64 Central Pierce County Aquifer Area SSA 59 FR 224 (1994);
SSA65 Cross Valley Aquifer Area SSA 52 FR 18606 (1987);
SSA66 Guemes Island Aquifer Area SSA 62 FR 63545 (1997);
SSA67a Lewiston Basin Aquifer Area SSA 53 FR 38782 (1988);
SSA67b Lewiston Basin Aquifer Source Area SSA 53 FR 38782 (1988);
SSA68 Marrowstone Island Aquifer Area SSA 59 FR 28752 (1994);
SSA69 Newberg Area Aquifer Area SSA 52 FR 37215 (1987);
SSA70 North Florence Dunal Aquifer Area SSA 52 FR 37519 (1987);
SSA71a Spokane Valley-Rathdrum Prairie Aquifer Area SSA 43 FR 5566 (1978);
SSA71b Spokane Valley-Rathdrum Prairie Aquifer Source Area SSA 43 FR 5566 (1978);
SSA72 Vashon-Maury Island Aquifer Area SSA 59 FR 34468 (1994);
SSA73 Whidbey Island Aquifer Area SSA 47 FR 14779 (1982);
SSA76a Troutdale Aquifer System Area SSA 71 FR 52541 (2006);
SSA76b Troutdale Aquifer System Source Area SSA 71 FR 52541 (2006)0.0000010.000001Decimal degreesNorth American Datum of 1983Geodetic Reference System 19806378137.000000298.257222EPA_Sole_Source_Aquifers.zipSole Source Aquifer surface vector polygon attribute table.N/ASSA_IDCharacter string of the form "SSA_##" providing an identifier for the SSA designations. Since a given SSA can be located in more than a single county, a concatenation of the SSA_ID and the FIPS code are needed to establish a unique database key. Where polygons are provided for streamflow zones or other special features related to the SSA designations, the SSA_ID takes the form of SSA##a, SSA##b, or SSA##b. An example for an SSA designation involving 3 polygons areas is: SSA46a Edwards Aquifer II (Austin Area) SSA - Streamflow Source Zone 53 FR 20897 (1988); SSA46b Edwards Aquifer II (Austin Area) SSA -Recharge Zone 53 FR 20897 (1988); SSA46c Edwards Aquifer II (Austin Area) SSA - Artesian Zone 53 FR 20897 (1988).Computed based on SSA_IDs developed for the Drinking Water Mapping Application and information in Federal Register Notices and GIS attributes in polygons supplied from the EPA Regions.SSA01 thru SSA79Related to time of designationUSEPA/OWSSA_NAMEThe name of the SSA taken from the Federal Register and corresponding to a given SSA. The name will contain information related to the streamflow zone or other special features related to a specific polygon.USEPACharacterCharacter value.USEPA/OWFederal Register IDCharacter string of the form "## FR #### (YYYY)" providing an identifier for the Federal Register citation for the SSA designations. Attribute_Definition_Source: Computed based on SSA_IDs developed for the Drinking Water Mapping Application and information in Federal Register Notices and GIS attributes in polygons supplied from the EPA Regions.USEPACharacterCharacter valueUSEPA/OWSSA CoordinatorThe sole source aquifer coordinator for that aquifer's regionProvided by EPA regionsCharacterCharacter valueUSEPA/OWPhone NumberThe phone number of the sole source aquifer coordinator for that aquifer's regionProvided by the SSA Coordinator for that regionCharacterCharacter valueUSEPA/OWEmailThe email address of the sole source aquifer coordinator for that aquifer's regionProvided by the SSA Coordinator for that regionCharacterCharacter valueUSEPA/OWSSA ID, SSA NAME, Federal Register ID, SSA Coordinator, Phone Number, EmailCitation 1Downloadable Datahttps://edg.epa.gov/EPA_Data_License.htmU.S. Environmental Protection Agency, Office of WaterTerrell TiendrebeogoIT Specialistmailing and physical address1200 Pennsylvania Avenue, N.W.WashingtonDC20460202-564-1534safewater@epa.govFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local time2020082120260821U.S. Environmental Protection Agency, Office of WaterSafe Drinking Water HotlineIT Specialistmailing and physical address1200 Pennsylvania Avenue, N.W.WashingtonDC20460202-564-1534safewater@epa.gov