Texas Wastewater Class B Practice Exam

Which material is NOT commonly used for sewer lines?

1. Ductile iron

2. PVC

3. Brick

4. Cast iron

The correct answer is: Brick

The selection of materials for sewer lines is influenced by factors such as durability, resistance to corrosion, and structural integrity. While ductile iron, PVC, and cast iron are widely recognized for their effectiveness in handling sewage, brick is not commonly used for modern sewer line applications. Brick was historically used for sewers due to its durability and availability. However, its use has greatly diminished because it is more susceptible to infiltration and can suffer from structural issues such as cracking and deterioration over time. Additionally, modern materials like ductile iron and PVC offer benefits that make them preferable for sewer systems, including stronger structural performance, lower maintenance needs, and easier installation. Thus, brick is less commonly used in contemporary sewer line construction, making it the correct choice in this context.