Groundwater WatchLatest News...

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 AquifersBRF151
Basin and Range Carbonate-Rock AquifersBRC7
Biscayne AquiferBIS76
California Coastal Basin AquifersCCB90
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 SystemFLS74
Hawaii Volcanic-Rock AquifersHVR15
High Plains Aquifer Groundwater NetworkHPN1174
Intermediate Aquifer SystemIAS76
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 SystemPAS39
Piedmont and Blue Ridge Aquifer Groundwater NetworkPBR48
Piedmont and Blue Ridge Carbonate-Rock AquifersPBA6
Rio Grande Aquifer SystemRIO79
Sand and Gravel Aquifers (glaciated regions)SGA299
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 SystemSCP26
Southern Nevada Volcanic-Rock AquifersSNV2
Surficial Aquifer SystemSAS73
Upper Cretaceous AquifersUPC13
Valley and Ridge AquifersVAR25

Aquifers shown/not shown: 23 / 21

AccessibilityFOIAPrivacyPolicies and Notices

Take Pride in America logoU.S. Department of the Interior |U.S. Geological Survey
Page Contact Information: Contact the USGS Office of Groundwater
Last update: Wednesday, August 22, 2018 at 12:59