An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Underground Injection Control (UIC)

Requirements for all Class I Wells and Class I Hazardous Waste Wells

There are a common set of requirements for all Class I wells and Class I hazardous waste wells. The common requirements are categorized by:

  • Siting - Demonstrates fluids are injected into a formation that is below the lowermost formation containing a USDW, and within 1/4 mile of a well.
  • Construction - Requires a multilayered design to prevent fluids from entering USDWs.
  • Operation, monitoring, and testing - Ensures multiple safeguards to ensure the injected wastewater is fully confined. 
  • Record keeping and reporting - Ensures that there are no leaks in the casing, tubing, or packer and that the injected fluid is contained within the injection zone. 
  • Closure - Informs the UIC program about the operation of the well and all testing results. 
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.