U.S. Geological Survey
National Water-Quality Assessment Program
USGS Internal Access Only

Report plans

Natural and anthropogenic characteristics of alluvial basins in the southwestern United States 

Conceptual understanding and ground-water quality of selected basins-fill aquifers in the southwestern United States

Effects of natural and human factors on ground-water quality in basin-fill aquifers in the southwestern United States—a conceptual model

Statistical models for predicting ground-water quality conditions in basin-fill aquifers in the southwestern United States

Southwestern Principal Aquifers Group Circular

Back to the Basin and Range Alluvial and Carbonate-rock Aquifers Status and Trends page.

Back to the Southwest Principal Aquifers (SWPA) Regional Assessment page.