What is an injection well?
The Safe Drinking Water Act underground injection control (UIC) program defines an injection well as any bored, drilled, or driven shaft, or a dug hole where the depth is greater than the largest surface dimension, that is used to discharge fluids underground. This definition covers a wide variety of injection practices ranging from technically sophisticated and highly monitored wells which pump fluids into isolated formations far below the Earth's surface to more numerous on-site drainage systems that discharge fluids a few feet underground, such as septic systems, cesspools, and storm water wells. More information about injection wells and the UIC program is available at http://water.epa.gov/type/groundwater/uic/.
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