UST Designated Operator A Certification Practice Test 2026 – All-in-One Guide to Master Your Certification!

The most common cause of UST leaks is the corrosion of the tank or piping. Tanks and piping systems, particularly those made from steel, are susceptible to corrosion when they come into contact with water and various chemicals in the soil. Over time, this corrosion can lead to the development of small holes or cracks, allowing the fuel or hazardous materials stored within to leak into the surrounding environment.

Corrosion is often exacerbated by poor maintenance practices or the presence of underground contaminants, which can accelerate the deterioration of the tank's materials. While other factors like pump failures, improper installation, and overfilling can certainly lead to leaks, they are less frequent compared to the effects of corrosion over the long term. Understanding the primary role corrosion plays in UST leaks highlights the importance of regular inspections and maintenance to mitigate this risk. Proper protective measures, materials, and monitoring systems can help prevent corrosion-related failures in underground storage systems.