National Water-Quality Assessment (NAWQA) Program

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Water Quality in Carbonate Aquifers in the United States

The Report Summary of Findings Study Design
The Report:
Scientific Investigations Report 2008-5240

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While available, copies of this report can be obtained by contacting the Pennsylvania Water Science Center at (717) 730-6946 or by e-mail at jbricker@usgs.gov

Nitrogen loading varied among the aquifers in this study

NITROGEN LOADING: Estimates of nutrient loadings to the land surface from atmospheric deposition, fertilizer, manure, and septic systems are also used to estimate sources of nitrate. The Piedmont aquifer has the highest loadings of nitrogen, primarily from manure application. Septic systems are typically the smallest component of nitrogen loading. The illustration shown is based upon figure 5 of SIR 2008-5240

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