Are underground injection wells only used to dispose waste?

Although Class I wells inject hazardous and nonhazardous waste, all injection wells are not waste disposal wells. For example, Class II wells inject fluids for enhanced recovery of oil and natural gas, and Class III wells inject super-heated steam, water, or other fluids into formations in order to extract minerals. Some Class V wells inject surface water to replenish depleted aquifers or to prevent saltwater intrusion. Additional information regarding underground injection wells is available at http://water.epa.gov/type/groundwater/uic/index.cfm.

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