True or False: Septic tanks may be made of 1.5 inch-thick steel.

The statement is false because septic tanks are not typically constructed of 1.5 inch-thick steel. Generally, septic tanks are made from materials such as concrete, fiberglass, or polyethylene, which are chosen for their durability and resistance to corrosion and chemicals present in wastewater. While steel may technically be used for septic tanks, it is not a common practice, especially with the preference for non-corrosive materials. Additionally, using thin steel would be susceptible to rust and structural failure over time, leading to potential environmental hazards. Thus, the common understanding and best practices in septic tank construction do not endorse the use of steel tanks of that thickness for safety and longevity reasons.