CWEA Maintenance Technologist Practice Test 2026 – Complete Exam Prep

Reinforced concrete and plastic are commonly used materials for constructing wastewater treatment tanks due to their durability, resistance to corrosion, and ability to withstand the pressures associated with wastewater treatment processes.

Reinforced concrete is especially favored for its strength and longevity, offering structural support and the capacity to handle large volumes of water. Concrete can also be molded into various shapes, making it versatile for different tank designs. Its density helps in minimizing issues related to buoyancy in submerged tanks.

Plastic, specifically high-density polyethylene (HDPE) and other resistant thermoplastics, is used for smaller tanks or specific applications where corrosion resistance is critical. Plastic materials are lightweight and have a relatively lower installation cost, making them suitable for certain types of treatment systems.

While wood, fiberglass, and steel can be used in specific scenarios, they may not provide the same level of efficiency, durability, or cost-effectiveness for large-scale wastewater treatment installations as reinforced concrete and plastic. Wood can deteriorate due to moisture and chemical exposure, fiberglass may not withstand heavy loads as effectively, and steel can be prone to corrosion if not properly treated or maintained.