Underground Injection Control
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The Underground Injection Control Program regulates the subsurface injection of nonhazardous waste fluids, subsurface storage of liquid and gaseous fluids, and mineral solution mining to protect current and future uses of Underground Sources of Drinking Water (USDW). A USDW site is defined as an aquifer which currently, or could, supply a public water system with drinking water.
The US EPA regulations group injection wells into six classes. The Wyoming UIC Program regulates Class I, Class V, and Class VI injection wells.
Class I
Regulated by Wyoming UIC Program.
Deep disposal of industrial, commercial or municipal waste below the deepest usable aquifer, including all wells which dispose waste on a commercial basis, even if the waste would otherwise be injected into a Class II well.
Class II
Deep disposal of hydrocarbons, brines, or other fluids produced in conjunction with oil and gas production, regulated by the Wyoming Oil and Gas Conservation Commission.
Class III
Injection wells for the recovery of minerals, such as in situ coal gasification, or solution mining of minerals such as copper, uranium, trona, etc., regulated by Land Quality.
Class IV
A prohibited type of facility that disposes hazardous waste into or above any usable aquifer, such as automotive sumps.
Class V
Regulated by Wyoming UIC Program.
All other facilities not included in Classes I-IV that dispose of fluids or other material into the subsurface, including, but not limited to heat pumps, remedial injections, underground stormwater disposal systems, Coal Bed Methane produced water, commercial septic systems and other large capacity septic systems.
Class VI
Regulated by Wyoming UIC Program.
Facilities that inject carbon dioxide for long-term storage, also known as Geologic Sequestration of CO2.