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UST systems, or Underground Storage Tank systems, must adhere to specific federal regulations to ensure environmental protection and safety. According to the federal guidelines, these systems should be inspected at least once every three years. This frequency is established to monitor compliance with safety standards, as well as to identify potential leaks or malfunctions that could result in environmental contamination. Regular inspections help maintain the integrity of the UST system, and the three-year interval allows enough time to check for wear and tear while ensuring that any issues are addressed before they can escalate into more serious problems.

In contrast, some of the other options suggest frequencies that do not align with the established regulations. Annual inspections might not provide sufficient time to recognize trends or issues that develop more gradually, while monthly inspections could be seen as excessive and could create unnecessary burdens on resources without providing proportional benefits in monitoring. The three-year interval strikes a balance, ensuring that UST systems remain safe and compliant with environmental standards.