Sole Source Aquifers
Description | Spatial | Data Structure | Data Quality | Data Source | Data Distribution | Metadata
Description
Citation
Title: Sole Source Aquifers
Originators: USEPA Office of Water
Publisher: U.S. EPA Office of Water
Publication place: Washington, D.C.
Publication date: 20090601
Data type: vector digital data
Description
Abstract:
Data provide a vector polygon GIS layer showing available materials representing extents at the land surface related to 78 designated Sole Source Aquifers (SSA) related to announcements in the Federal Register. GIS coverages for SSAs were obtained from EPA Regions 1, 2, 5, 6, 8, 9, and 10 for a baseline period in September of 2009. Each SSA polygon was checked against the Federal Register (FR) determination for that SSA. These coverages were appended, in order to create a national seamless coverage of SSAs. There are 89 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. GIS materials are not available at this time for the St. Joseph SSA in Indiana [53 FR 23682 (1988)].
Purpose:
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.
Supplemental information:
GIS coverages for areas related to SSA designations were obtained from EPA Regions 1, 2, 3,4,5, 6, 9, and 10 for a baseline period of September, 2009. Each SSA polygon was checked against the Federal Register (FR) determination for that SSA. These coverages were appended, in order to create a national seamless coverage of SSA's. There are no official IDs for the SSAs. The SSA_IDs developed for the Drinking Water Mapping Application assign an ID (in the format SSA##) based on the Federal Register notices. The name of the SSA (SSA_NAME) and the Federal Register (FR_ID) are also provided to be able to identify each of the SSA polygons in this GIS layer. EPA provides background information on the SSA program at the following Internet address: <http://cfpub.epa.gov/safewater/sourcewater/sourcewater.cfm?action=SSA>
Time Period of Data
Date: 20090101
Currentness reference:
publication date
Status
Data status: In work
Update frequency: As needed
Key Words
Theme:
Keywords: Inland Waters
Keyword thesaurus: ISO 19115 Topic Category
Theme:
Keywords: Inland Waters
Keyword thesaurus: ISO 19115 Topic Category
Place:
Keywords: United States
Keyword thesaurus: U.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.
Place:
Keywords: United States
Keyword thesaurus: None
Data Constraints and Credit
Access constraints:
None
Use constraints:
Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Point Of Contact
Organization: USEPA Office of Water
Person: A. R. Anzzolin
Position: GIS Coordinator
Phone: 202-564-4093
Email: anzzolin.roger@epa.gov
Address type: mailing
Address:
1200 Pennsylvania Ave, NW
Address:
Mail Stop 4606M
City: Washington
State or Province: DC
Postal code: 20460-0001
Security Information
Security classifiction system: FIPS Pub 199
Security handling: Standard Technical Controls
Spatial Reference Information
Horizontal Coordinate System
Coordinate System Details
Geographic coordinate system
Latitude resolution: 8.98315284119521e-009
Longitude resolution: 8.98315284119521e-009
Geographic coordinate units: Decimal Degrees
Geodetic model
Horizontal datum name: D North American 1983
Ellipsoid name: GRS 1980
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257222101
Spatial Domain
Below are the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Unprojected coordinates (geographic)
Boundary Coordinate
West -158.147059 (latitude)
East 144.956768 (latitude)
North 48.588894 (longitude)
South 13.414815 (longitude)
Data Structure and Attribute Information
Name and Format
Data type: vector digital data
Native dataset environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959
Overview
Entity and attribute overview:
SSA_ID, SSA_NAME and FR_ID
Entity and attribute detailed citation:
Citation 1
Direct spatial reference method: Vector
Attributes of SoleSourceAquifers
Description:
Sole Source Aquifer surface vector polygon attribute table.
Source:
Federal Register Notice 1974
Attributes
OBJECTID
Definition:
Internal feature number.
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
ESRI
Shape
Definition:
Feature geometry.
Attribute values: Coordinates defining the features.
Attribute definition source:
ESRI
SSA_ID
Definition:
Character 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).
Attribute domain values
Value Definition
SSA_001 thru SSA_078
Related to time of designation
Definition Source:
USEPA/OW
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.
SSA_NAME
Definition:
The 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.
Attribute domain values
Value Definition
Character
Character value.
Definition Source:
USEPA/OW
Attribute definition source:
USEPA
FR_ID
Definition:
Character 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.
Attribute domain values
Value Definition
Character
Character value
Definition Source:
USEPA/OW
Attribute definition source:
USEPA
SHAPE_Length
Definition:
Length of feature in internal units.
Attribute values: Positive real numbers that are automatically generated.
Attribute definition source:
Esri
SHAPE_Area
Definition:
Area of feature in internal units squared.
Attribute values: Positive real numbers that are automatically generated.
Attribute definition source:
Esri
SDTS Feature Description
Spatial data transfer standard (SDTS) terms
Feature class
Type: GT-polygon composed of chains
Count: 89
Data Quality and Accuracy Information
General
Logical consistency report:
Not presently available
Completeness report:
Not presently available
Positional Accuracy
Horizontal accuracy report:
Positional accuracy for the data set varies for individual features within the data set. Actual horizontal positional accuracy for the data set is unknown.
Vertical accuracy report:
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>.
Data Source and Process Information
Process Steps
Process step information
Process Step 1
Process description:
GIS coverages for SSA's were obtained from EPA Regions 1, 2, 3, 4, 5, 6, 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)
Process date: 20090101
Data Distribution Information
General
Distribution liability:
Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Distribution Point of Contact
Organization: USEPA Office of Water (office of Ground Water and Drinking Water)
Person: A. Roger Anzzolin
Position: GIS Coordinator
Phone: 202-564-4093
Email: anzzolin.roger@epa.gov
Address type: mailing
Address:
1200 Pennsylvania Ave. NW
Address:
Mail Stop 4606M
City: Washington
State or Province: DC
Postal code: 20460-0001
Metadata Reference
Metadata Date
Last updated: 20170301
Future metadata review date: 20110718
Metadata Point of Contact
Organization: USEPA Office of Water Office of Ground Water and Drinking Water)
Person: A. Roger Anzzolin
Position: GIS Coordinator
Phone: 202-564-4093
Email: anzzolin.roger@epa.gov
Address type: mailing
Address:
1200 Pennsylvania Ave. NW
Address:
Mail Stop 4606M
City: Washington
State or Province: DC
Postal code: 20460-0001
Metadata Standards
Standard name: FGDC Content Standard for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 1.7
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It shows metadata elements defined in the Federal Geographic Data Committee (FGDC) standard and the ESRI Profile of the Content Standard for Digital Geospatial Metadata (ESRI Profile). This stylsheet is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or techical support.
Instructions: Click the title on the top of the page to toggle opening and closing all metadata content sections. Or tab to individual sections by clicking the section links listed horizontally below the title. Section names are centered and shown in white with a blue background. Click on a section name (e.g. Description) to open and close all section content, or individually click terms listed on the left (Status, Key Words, etc.) to individually open and close section content items. Note, some section content items (Citation, Description, etc.) are intentionally opened by default due to their importance.
Key features: Supports W3C DOM compatible browsers such as IE6, Netscape 7, and Mozilla Firefox. Metadata content organized into sections that expand and collapse. Click on title to toggle opening and closing all content (metadata sections). Page header includes menu links that tab to invidual metadata sections. Page footer links to http://www.fgdc.gov/ web site. Ignores metadata XML elements that contain all whitespace (spaces, carriage returns, tabs, line feeds, etc). Over 40 metadata elements are parsed to respect line breaks introduced by metadata author to either start a new line or a new paragraph, depending on number of consecutive line breaks and white space characters present. Over 40 metadata elements are searched for internal URL strings (that contain a "://" or "www.") and converts each one to a hypertext link. Browse graphic image and description displayed together on same page if image is JPG, JPEG, GIF, PNG, or BMP. Other browse graphic file types such as PDF popup in separate window. Enumerated attribute domain values listed in HTML table, which can be opened and closed. All FGDC metadata elements supported. FGDC Process Steps include full descriptions of each Data Source Used and Produced as long as the value of Process Step's Source Citation Used (srcused) and Source Citation Produced (srcprod) metadata element match a Data Source Citation (srccitea) metadata element value. All ESRI metdata elements supported except for Binary elements used to include thumbnail image. Includes ESRI Geoprocessing History, ESRI Feature Terms, ESRI Geometric Network, ESRI Subtype, ESRI Relationship Class, ESRI Topology, and ESRI Raster elements. Topology rules are named and described as shown on the ESRI topology_rules_poster.pdf included with ArcGIS software.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.
NEPAssist: Metadata