Frequent Questions

Is it possible to find out the number of Class II oil and gas underground injection control (UIC) wells in a particular state?

EPA has compiled a state-by-state inventory of injection wells, which shows the approximate number of each class of wells by state. More specific information, including the exact number of Class II UIC wells in a state may be available from the regional or state Underground Injection Control Program contact. A list of these contacts is available at

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