Underground oil tanks are a liability
They are like ticking time bombs. According to American Petroleum Institute underground tanks last about 20 years. Because they are out of sight, they can cause damage without your knowledge. This damage could occur over years of use. Underground oil tanks last about twenty years; then they may leak into your property, contaminating the soil and groundwater. Water can also leak into your tank, reducing the usable capacity of the tank, and fouling the burner on your furnace. Underground oil tanks can also be a problem when it comes time to sell your home. This is especially true for older homes that have been converted to gas service, since the old tank was probably left in the ground when the conversion occurred.