National Water-Quality Assessment (NAWQA) Project

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Special studies on source-water and drinking-water quality
Surface-water intakes
General Information

Primary Lithologies of Select Principal Aquifers

Detailed information about geology of all principal aquifers is available from the USGS Ground Water Atlas

Primary Lithologies


Sand and Gravel
  • Basin and Range basin-fill aquifers
  • California Coastal Basin aquifers
  • Central Valley aquifer system
  • Columbia Plateau basin-fill aquifers
  • Glacial aquifer system
  • High Plains aquifer
  • Rio Grande aquifer system
  • Snake River Plain basin-fill aquifers
  • Surficial aquifer system overlying the Floridan
Semiconsolidated Sand
  • Coastal Lowlands aquifer system
  • Mississippi Embayment aquifer system
  • Northern Atlantic Coastal Plain aquifer system
  • Texas Coastal Uplands aquifer system
Sandstone Rock
  • Cambrian-Ordovician aquifer system
  • Denver Basin aquifer system
  • Early Mesozoic basin aquifers
  • Valley and Ridge non-carbonate-rock aquifers
Carbonate Rock
  • Basin and Range carbonate-rock aquifers
  • Biscayne aquifer
  • Floridan aquifer system
  • Piedmont and Blue Ridge carbonate-rock aquifers
  • Valley and Ridge carbonate-rock aquifers
Crystalline Rock
  • Piedmont and Blue Ridge crystalline-rock aquifers
  • New England crystalline-rock aquifers
Basaltic Rock
  • Columbia Plateau basaltic-rock aquifers
  • Hawaiian volcanic-rock aquifers
  • Snake River Plain basaltic-rock aquifers
Sandstone and Carbonate Rock
  • Edwards-Trinity aquifer system

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Page Last Modified: Tuesday, 04-Mar-2014 14:45:23 EST