Mapping 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 restrict 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 us
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
GIS Data and Services
Geospatial data for download and web map services are maintained by Oregon DEQ’s Drinking Water Protection group. Specialty GIS software (like Esri ArcMap) is needed to download data and use the map services. Read a description of available services and file locations
. GIS datasets available for direct download include the following:
Surface water drinking water source areas in Oregon
(Updated: March 4, 2019)
] [GIS Layers
Groundwater drinking water source areas in Oregon
(Updated: March 29, 2019)
] [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
Excel Version (includes full data set)
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 1A: Northwest Oregon
Map 1B: Southwest Oregon
Map 1C: Eastern Oregon
The high soil erosion potential data is based on Natural Resource Conservation Service and National Forest Service data for slope (>30%) and “Kf” (a “rock-free” soil erodibility 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. Other assessment methods (see Maps 6 and 7) ay be more appropriate for flatter terrains, varied slopes, or in areas where Kf is not available. In the Updated Source Water Assessments, this method is primarily used only for US Forest Service lands where the other assessment methods (Maps 6 and 7) are not available.
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.
Map 3A: Northwest Oregon
Map 3B: Southwest Oregon
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.
Map 6: Surface water drinking water source areas with NRCS Soil Erosion Hazard Ratings - Off-Road/Off-Trail (for management activities such as silviculture, grazing, mining, urban development, fire, firebreaks, etc with <75% soil surface disturbance)
This dataset provides surface erosion hazard ratings for areas where up to 75% of the soil surface is disturbed by non-road and non-trail uses (such as uncontrolled grazing, forestry, heavy equipment use, fire control, and mining). The erosion hazard ratings are calculated by the Natural Resource Conservation Service using inherent soil properties for whole soil erodibility and slope. This method underestimates erosion hazard for Histosol soils and for gully erosion, plowing or other disturbances that “disturb up to nearly 100 percent of the area and change the character of the soil”. Other assessment methods (see Map 7) may be more appropriate for flatter terrains with 75-100% soil disturbance. In the Updated Source Water Assessments, DEQ mapped only those locations where risk is moderate or higher AND that are within 300 feet of surface water in order to estimate those places where delivery to water is possible. Where NRCS soils data is not available (typically National Forest Lands) Soil Resource Inventory information from the US Forest Service can be used to evaluate erosion potential (see Map 2).
Map 6A: Northwest Oregon
Map 6B: Southwest Oregon
Map 6C: Eastern Oregon
Map 7: Surface water drinking water source areas with Oregon Department of Agriculture (ODA)
Soil Erosion Vulnerability Index Ratings (for areas with >75% soil disturbance (such as tilled or bare soil with lower slopes (i.e. valleys and agricultural lands)
This dataset shows ODA’s Erosion Vulnerability Index that is calculated utilizing USDA Natural Resource Conservation Service Revised Universal Soil Loss Equation-2 (RUSLE2) assuming exposed soil without plant roots and lacking conservation practices to reduce erosion. Therefore, this index reflects erosion risk from severe agricultural disturbance without mitigating measures in place. It does not evaluate delivery to surface waters. In the Updated Source Water Assessments, DEQ maps only those locations where RUSLE2 values are moderate or higher AND slopes are low enough for intensive agriculture (<=30%) AND that are within 300 feet of surface water in order to estimate those places where delivery to water is possible. Where NRCS soils data is not available (typically National Forest Lands) Soil Resource Inventory information from the US Forest Service can be used to evaluate erosion potential (see Map 2).
Map 7A: Northwest Oregon
Map 7B: Southwest Oregon
Map 7C: Eastern Oregon
Statewide groundwater maps and land use data