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Principal Aquifer Composite Well Count

In order for a composite hydrograph to be eligible for display, a minimum
of nine (9) active Groundwater Watch wells must meet the 30-year period-of-record criteria.


Alluvial AquifersALL115
Arbuckle-Simpson AquiferABK1
Basin and Range Basin-Fill AquifersBRF154
Basin and Range Carbonate-Rock AquifersBRC7
Biscayne AquiferBIS75
California Coastal Basin AquifersCCB88
Cambrian-Ordovician Aquifer SystemCOS27
Central Valley Aquifer SystemCVS4
Coastal Lowlands Aquifer SystemCLA152
Colorado Plateaus AquifersCPA23
Columbia Plateau Basaltic-Rock AquifersCPB8
Denver Basin Aquifer SystemDBS1
Early Mesozoic Basin AquifersEMZ19
Edwards-Trinity Aquifer SystemETR1
Floridan Aquifer SystemFLS75
Hawaii Volcanic-Rock AquifersHVR16
High Plains Aquifer Groundwater NetworkHPN1174
Intermediate Aquifer SystemIAS76
Lower Cretaceous AquifersLCR8
Lower Tertiary AquifersLTR7
Mississippi Embayment Aquifer SystemMEA41
Mississippi River Valley Alluvial AquiferMRA202
Mississippian AquifersMSA8
New England Crystalline-Rock AquifersNEC6
North Coast Limestone Aquifer System (Puerto Rico)NCS8
Northern Atlantic Coastal Plain Aquifer SystemNAC606
Northern Rocky Mountains Intermontane Basins Aquifer SystemsNRM1
Ozark Plateaus Aquifer SystemOPS9
Pacific Northwest Basin-Fill AquifersPNB2
Paleozoic AquifersPLO2
Pennsylvanian Aquifer SystemPAS39
Piedmont and Blue Ridge Aquifer Groundwater NetworkPBR49
Piedmont and Blue Ridge Carbonate-Rock AquifersPBA6
Rio Grande Aquifer SystemRIO83
Sand and Gravel Aquifers (glaciated regions)SGA299
Silurian-Devonian AquifersSLR36
Snake River Plain Basaltic-Rock AquifersSKR23
Snake River Plain Basin-Fill AquifersSKF1
South Coast Aquifer (Puerto Rico)STH2
Southeastern Coastal Plain Aquifer SystemSCP28
Southern Nevada Volcanic-Rock AquifersSNV2
Surficial Aquifer SystemSAS77
Upper Cretaceous AquifersUPC12
Valley and Ridge AquifersVAR25

Aquifers shown/not shown: 23 / 21

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URL: https://groundwaterwatch.usgs.gov/aqfrstatusf100.asp
Page Contact Information: Contact the USGS Office of Groundwater
Last update: Wednesday, August 22, 2018 at 12:59