This page provides access to downloadable files which contain the indicator database of HUC12 subwatersheds in the contiguous U.S. as maintained by the EPA RPS Team. 

• Indicator Description File 
• Indicator Data Files by EPA Region
• Indicator Geodatabase

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Indicator Description File

This Excel file contains a table of all available HUC12 indicator names, definitions and data sources: 

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RPS HUC12 Indicator Descriptions (xlsx) (84.15 KB, May 2025)

Indicator Data Files by EPA Region

The Excel files below contain HUC12 indicator data for EPA Regions 1 through 10. Each file contains a table of indicator values and a table of indicator names and descriptions. Note that HUC12s that straddle more than one EPA Region appear in all relevant files.

Indicator data for subwatersheds in Alaska, Hawaii and U.S territories are maintained separately from the RPS Indicator Database and are available in custom Excel RPS Tool files for those states and territories. 

RPS HUC12 Indicator Data Files (xlsx) (Data updated) 

• RPS Indicator Data - EPA Region 1 (xlsx) (4.39 MB, May 2025)
  • Includes CT, ME, MA, NH, RI, VT
• RPS Indicator Data - EPA Region 2 (xlsx) (4.29 MB, May 2025)
  • Includes NJ, NY
• RPS Indicator Data - EPA Region 3 (xlsx) (8.43 MB, May 2025)
  • Includes PA, WV, VA, MD, DE, DC
• RPS Indicator Data - EPA Region 4 (xlsx) (23.7 MB, May 2025)
  • Includes KY, TN, NC, SC, MS, AL, GA, FL
• RPS Indicator Data - EPA Region 5 (xlsx) (23.8 MB, May 2025)
  • Includes IL, IN, MN, MI, OH, WI
• RPS Indicator Data - EPA Region 6 (xlsx) (28.67 MB, May 2025)
  • Includes TX, NM, AR, OK, LA
• RPS Indicator Data - EPA Region 7 (xlsx) (16.21 MB, May 2025)
  • Includes KS, NE, IA, MO
• RPS Indicator Data - EPA Region 8 (xlsx) (33.06 MB, May 2025)
  • Includes CO, WY, UT, ND, SD, MT
• RPS Indicator Data - EPA Region 9 (xlsx) (19.71 MB, May 2025)
  • Includes CA, AZ, NV
• RPS Indicator Data - EPA Region 10 (xlsx) (15.63 MB, May 2025)
  • Includes WA, OR, ID

Indicator Geodatabase

This Esri file geodatabase contains a shapefile of HUC12 polygons, a table of indicator values and a table of indicator names and descriptions: 

• RPS HUC12 Indicator Geodatabase (zip)  (last updated 05/28/2025)

The HUC12 shapefile in the geodatabase is the exact version of HUC12 polygons used for developing the RPS Indicator Database. The shapefile is consistent with the "Watershed Boundary Dataset Snapshot" version of HUC12 boundaries that was used for the National Hydrography Dataset Plus (NHDPlus) Version 2. Note that other HUC12 shapefiles may have different boundaries due to changes in the Watershed Boundary Dataset over time.