What percentage of underground storage tanks are expected to leak, and after how many years?

The selection of 40% is grounded in historical data regarding the integrity of underground storage tanks over time. Research indicates that a significant proportion of these tanks, specifically around 40%, are anticipated to experience leaks after a period of 15 to 20 years. As underground storage tanks age, factors such as environmental conditions, the type of material they contain, and the quality of their construction contribute to the deterioration of their structural integrity, increasing the likelihood of leaks.

This timeframe of 15 to 20 years is particularly critical because it aligns with inspection and maintenance recommendations often provided to tank owners. Proactively monitoring the condition of these tanks within this period can mitigate environmental impacts and potential regulatory issues. The recognized percentage and timeframe underscore the importance of diligent oversight and compliance with environmental regulations to protect both public health and the environment.