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Link to USGS Home Page.Source Water Assessment Program (SWAP) ArcIMS Mapping Tool

Information and data presented were obtained from various Federal, State, and local agencies and are subject to revision. The data are released on the condition that neither the Illinois EPA nor the United States Government may be held liable for any damages resulting from their use. The use of firm, trade, and brand names is for identification purposes only and does not constitute endorsement by the Illinois EPA.

How to Become a
Secure User

Start using the SWAP ArcIMS Mapping Tool
(opens in a new window)

User Information:

Users of the Source Water Assessment Program (SWAP) ArcIMS Mapping Tool can locate, create, and print maps of any size area within Illinois for use with SWAP issues. Map layers may be added by clicking the "visible" check box next to the layer's name and pressing the Refresh Map button. To locate an area of interest, select one of the following methods:

  • use the Zoom tool to draw a rectangle (left click and drag) over the area of interest, or
  • click on the Query tool and select an option that displays the area of interest.

When finished, the map can be printed using the Print tool. First time users may want to visit the Introduction and Help page for more detailed instructions (also available through the Help tool).

This site was developed using Environmental Systems Research Institute, Inc (ESRI) ArcIMS 4.0 Internet map server. Because of the nature of the Internet map server, the following pages are best viewed with Microsoft Internet Explorer 5.0 or later version, or Netscape Navigator 4.7 or later version.


  • Community Water Supply -- a public water supply that serves or is intended to serve at least 15 service connections used by residents or regularly serves at least 25 residents.
  • Non-community Water Supply -- a public water supply that is not a community water supply.
  • Public Water Supply -- all mains, pipes and structures through which water is obtained and distributed to the public, including wells and well structures, intakes and cribs, pumping stations, treatment plants, reservoirs, storage tanks and appurtenances, collectively or severally, actually used or intended for use for the purpose of furnishing water for drinking or general domestic use and which serve at least 15 service connections or which regularly serve at least 25 persons at least 60 days per year. A public water supply is either a community water supply or a non-community water supply.
  • Potential Source of Contamination - the phrase "potential source" is expressly used here to describe sources that possibly are or have the capability of becoming a source of drinking-water contamination.

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Source Water Assessment Program Mapping Tool
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