Protecting Underground Sources of Drinking Water from Underground Injection (UIC)
EPA regulates the construction, operation, permitting, and closure of injection wells used to place fluids underground for storage or disposal. Learn more about injection well types.
Hydraulic fracturing with diesel fuels
EPA has program requirements for permitting underground injection of diesel fuels in hydraulic fracturing to ensure protection of underground sources of drinking water (USDWs). Learn more about the permitting requirements.
Geologic sequestration of carbon dioxide
EPA has finalized requirements that address carbon dioxide injection for long-term storage to ensure that wells used for geologic sequestration are appropriately sited, constructed, tested, monitored, funded, and closed. Read more about Class VI wells.
This website contains information for owners and operators of injection wells, regulators, and the public about safe injection well operations to prevent the contamination of underground sources of drinking water.
UIC Topics in the Spotlight
UIC Well Classes
- Class I industrial and municipal waste disposal wells
- Class II oil and gas related injection wells
- Class III solution mining wells
- Class IV shallow hazardous and radioactive waste injection wells
- Class V wells that inject non-hazardous fluids into or above underground sources of drinking water
- Class VI geologic sequestration wells