For septic tanks greater than how many feet in the ground must they be traffic rated?

Septic tanks must be traffic rated when they are buried deeper than three feet to ensure they can withstand the load and pressure from vehicles and other heavy equipment that may pass over them. At depths greater than three feet, the soil above the tank exerts a significant amount of pressure, and a non-traffic rated tank may not be able to handle that pressure without risking structural failure. Thus, traffic-rated tanks are designed with reinforced materials and construction techniques to provide the necessary strength and durability under such conditions. This consideration plays a critical role in preventing potential leaks, collapses, or other failures that could lead to environmental hazards or costly repairs.