Who regulates class I disposal wells? 

Throughout the United States, the Environmental Protection Agency provides oversight and closely monitors deep well disposal operations. Laws, policies and regulations have matured over the past 100 years to enhance the safety of both non-hazardous and hazardous injection well operation. In many cases, state governments have been granted primary authority to conduct an Underground Injection Control (UIC) program. In others, the federal government directly implements the regulations. In all cases, strict standards are enforced by law to ensure that environmentally protective practices are followed. 
Geologic and engineering information is carefully evaluated before deep well construction can begin and is reviewed after drilling has been completed, and before injection operations are authorized. Continuous protection of all usable groundwater is accomplished by rigid construction requirements that provide at least four separate layers of protection. In addition to strict construction requirements, annual testing and limitation of waste type, disposal volume and injection well pressure are required to further promote protection of the accessible environment. Detailed records of wastes disposed and all site operations must be submitted to the EPA regulators and made available to the public. Twenty-four hour monitoring of operations is required to verify safe operation and permit compliance.

You can learn more about Class I injection wells by visiting the EPA website at: www.epa.gov/safewater/uic/class1.html