Underground Injection Control

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Draft UIC Permits currently in public comment period

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: 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: All other facilities not included in Classes I-IV that dispose of fluids into the subsurface, including Coal Bed Methane produced water and large capacity septic systems.
  • Class VI: Facilities that inject carbon dioxide for long-term storage, also known as Geologic Sequestration of CO2

Want more information on underground injection wells? Visit the US EPA Underground Injection Control Program website.