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#1 Federal
Estimated Densities of Residential Septic Tanks across the Conterminous United States for 12-digit Hydrologic Unit Code 12 (HUC12), National Hydrography Dataset Plus Version 2 (NHDPlusV2) Catchment, and Block Group Scales
- Organization: Department of the Interior
- Dataset Last Updated: July 30, 2025 at 12:00 AM
This dataset provides estimates of residential septic tank densities at 12-digit Hydrologic Unit Code (HUC12), National Hydrography Dataset (NHD Plus version 2.1, 1:100k scale) catchment, and 2020...
- xml
- xml
Search relevance: 1.00 | Views last month: 11 | Catalog Last Checked: May 05, 2026 at 10:14 PM
#2 Federal
Estimated nitrogen from septic for the conterminous United States, 2010 (SepN_CONUS_bg_2010)
- Organization: Department of the Interior
- Dataset Last Updated: August 21, 2020 at 12:00 AM
This metadata record documents a rudimentary estimate of nitrogen from septic for the conterminous United States for 2010, derived from block-group 1990 and 2010 Decennial Census of Population and...
- xml
- xml
Search relevance: 1.00 | Views last month: 2 | Catalog Last Checked: May 05, 2026 at 09:11 PM

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