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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 AquifersBRF148
Basin and Range Carbonate-Rock AquifersBRC7
Biscayne AquiferBIS76
California Coastal Basin AquifersCCB91
Cambrian-Ordovician Aquifer SystemCOS26
Central Valley Aquifer SystemCVS4
Coastal Lowlands Aquifer SystemCLA128
Colorado Plateaus AquifersCPA20
Columbia Plateau Basaltic-Rock AquifersCPB8
Denver Basin Aquifer SystemDBS1
Early Mesozoic Basin AquifersEMZ16
Edwards-Trinity Aquifer SystemETR1
Floridan Aquifer SystemFLS75
Hawaii Volcanic-Rock AquifersHVR15
High Plains Aquifer Groundwater NetworkHPN1174
Intermediate Aquifer SystemIAS75
Lower Cretaceous AquifersLCR8
Lower Tertiary AquifersLTR7
Mississippi Embayment Aquifer SystemMEA33
Mississippi River Valley Alluvial AquiferMRA184
Mississippian AquifersMSA8
New England Crystalline-Rock AquifersNEC6
North Coast Limestone Aquifer System (Puerto Rico)NCS8
Northern Atlantic Coastal Plain Aquifer SystemNAC590
Northern Rocky Mountains Intermontane Basins Aquifer SystemsNRM1
Ozark Plateaus Aquifer SystemOPS9
Pacific Northwest Basin-Fill AquifersPNB2
Paleozoic AquifersPLO2
Pennsylvanian Aquifer SystemPAS40
Piedmont and Blue Ridge Aquifer Groundwater NetworkPBR47
Piedmont and Blue Ridge Carbonate-Rock AquifersPBA6
Rio Grande Aquifer SystemRIO78
Sand and Gravel Aquifers (glaciated regions)SGA298
Silurian-Devonian AquifersSLR35
Snake River Plain Basaltic-Rock AquifersSKR24
Snake River Plain Basin-Fill AquifersSKF1
South Coast Aquifer (Puerto Rico)STH2
Southeastern Coastal Plain Aquifer SystemSCP27
Southern Nevada Volcanic-Rock AquifersSNV2
Surficial Aquifer SystemSAS73
Upper Cretaceous AquifersUPC13
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: Thursday, May 17, 2018 at 03:50