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USGS Groundwater Information

Groundwater Resources Program

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 [Photo: Groundwater flowing out of well.]

New & Noteworthy

* Press Release: Study Explores Groundwater and Geothermal Energy in Drought-Stricken Eastern Oregon and Neighboring States

* Technical Announcement: USGS Issues Revised Framework for Hydrogeology of Floridan Aquifer

* Press Release: High Plains Aquifer Groundwater Levels Continue to Decline

* Regional Groundwater Availability Study Geospatial Data

* Press Release: USGS Assesses Current Groundwater-Quality Conditions in the Williston Basin Oil Production Area

Past listings...

USGS Groundwater Watch

USGS maintains a network of active wells to provide basic statistics about groundwater levels.

 [Image: USGS active water level wells location map.]

Other Water Topics

*  Water Resources

*  Groundwater

*  Surface Water

*  Water Quality

*  Water Use

USGS in Your State

USGS Water Science Centers are located in each state.

 [Map: There is a USGS Water Science Center office in each State.] Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Water-Table Fluctuation (WTF) Method

Recent Case Studies of Water-Table Fluctuation Method

Table 1. Recent studies illustrate the application of this method -- click site name for details:


Minnesota Surficial Aquifers

Delin and others, (2007)

North Carolina Coastal Plain

Coes and others, (2007)

Pennsylvania Fractured Rock Site

Risser and others (2005)


Humid, flat to rolling hills, glacial deposits, agricultural and forested land

Humid, coastal plain physiographic province, low relief, sandy soils, mixed urban and agricultural land

Humid, rolling hills in Appalachian Plateaus province, fractured rock, agricultural and forested land

Depth to water table

1-15 m

~1-8 m

1-30 m

Mean annual precipitation

70 cm

127 cm

107 cm

WTF recharge
(as % of precip)







Age-dating of groundwater recharge
(as % of precip)






Rorabaugh equations
(as % of precip)






NA, not available

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Page Last Modified: Tuesday, 03-Jan-2017 20:47:04 EST