Water Quality Programs

M​apping and GIS Data​

Maps of the groundwater and surface water drinking water source areas and potential contaminant sources identified within those drinking water source areas are available in several formats including an online interactive mapping tool, GIS data layers and in a print-ready formats.
 
Due to security reasons, the agencies are restricting access to the GIS layers with latitude/longitude readings of wells, springs and intakes.
If you do not find what you are looking for or would like individual maps, data layers or data queries at a local or regional scale, please contact DEQ's GIS Specialist at 503-229-6798.
 

Drinking Water Protection Interactive Map Viewer

 

Instructions on how to view source water areas using DEQ's Interactive Viewer

Legend key and notes on available information 

  • Surface water drinking water source areas in Oregon (Updated: Sept. 5, 2017)
    Download: [Map] [GIS Layers]
  • Groundwater drinking water source areas in Oregon (Updated: Sept. 5, 2017)
    Download: [Map] [GIS Layers]
  • Groundwater 2-year time-of-travel zones for drinking water source areas
    Download: [GIS Layers] (Updated: Sept. 5, 2017)
  • Potential Contaminant Sources as of Oct. 2005 (updated info available on Interactive Map Viewer)
    Download: [GIS Layers]
  • Additional DEQ GIS Data.
 

Statewide surface water maps and land use data

As part of the Updated Source Water Assessments, DEQ developed a statewide land use/ownership GIS layer to evaluate land cover in drinking water source areas.  The land use/ownership layer is a combination of multiple datasets that have been modified by grouping land owner categories in order to simplify data display on the map. See Notes for data sources, methods, and data limitations. Statewide and individual public water systems source area summaries are provided below: Maps for each public water system are provided in the Updated Source Water Assessment report. 
 
Table 1: Summary of land use/ownership in Oregon Drinking Water Source Areas served by surface water sources
PDF Version 
Excel Version (includes full data set) 
Notes

This dataset includes total square miles and total percentage of land use for each generalized land use/ownership category for each surface water source area. Excel table can be sorted by watershed, county, population served, or specific land use. See Notes for data sources, methods, and data limitations. 

Map 1:  Oregon surface water drinking water source areas with land use/ownership

Expanded views 
Map 1A: Northwest Oregon 
Map 1B: Southwest Oregon  
Map 1C: Eastern Oregon 

Figure 1: Approximate percentage of land uses with drinking water source areas for surface water 

 

Map 2: Surface water drinking water source areas with land use/ownership and soils with high erosion potential​

The high soil erosion potential data is based on Natural Resource Conservation Service and National Forest Service data for slope (>30%) and “K-factor” (of 0.25 or greater) which quantifies the susceptibility of soil particles to detachment and movement by water including the effects of rainfall, runoff and infiltration. Soils with "high" soil erosion potential are considered more sensitive to ground disturbance. For future assessment on flatter terrains or in areas where K-factor is not available, a comparable approach will be developed and vetted with input from Oregon Department of Agriculture, Natural Resource Conservation Service and others.

 Expanded views
Map 2A: Northwest Oregon  
Map 2B: Southwest Oregon   
Map 2C: Eastern Oregon 

Map 3: Oregon surface water drinking water source areas with DOGAMI landslide inventory

This dataset includes earth and debris slides, flows, slumps, falls and complex landslide types (but not rock material landslide deposits) from the Statewide Landslide Information Database for Oregon.  Additional information and data limitations can be found at http://www.oregongeology.org/sub/slido/. Maps for each public water system are provided in the Updated Source Water Assessment report..  OR DEQ's Water Quality Program is currently working with DOGAMI to develop and provide a more detailed landslide potential analysis for public water systems. Contact Oregon DEQ's Environmental Solutions Division/Water Quality Program for further information on the analysis. 
Expanded views
Map 3C: Eastern Oregon 

Map 4: Domestic/Private surface water rights

EPA and Oregon regulations that protect public drinking water systems do not apply to private water supplies, however knowing where domestic withdrawals occur is important to identify water users in watersheds and protect public health. This map shows the density of “domestic”(private) points of surface water diversion identified in the Oregon Water Resources Department water rights database.  It is important to note that this is likely a subset of all domestic water users as many domestic water users may not hold water rights. 

Map 5: Treatment system susceptibility for public water systems using surface water 

This map shows the types of drinking water treatment technologies employed by public water systems in Oregon and their relative susceptibility to particulate matter and turbidity in the water.

Statewide groundwater maps and land use data