What type of plastic is generally used for water services?

• A. Polyvinyl Chloride and Polyethylene
• B. Polypropylene
• C. Polycarbonate
• D. Polystyrene

Answer: (A)

Plastic materials chosen for water services prioritize safety for drinking water, durability, and ease of installation. The most common options are PVC and polyethylene. PVC is rigid, corrosion-resistant, and cost-effective, with widespread use for service lines and mains and well-supported potable-water fittings and joints. Polyethylene is flexible and tough underground, well-suited for service lines under varying soils and stresses, and it can be joined reliably through fusion or mechanical methods. Together, they cover a wide range of sizes and pressures while meeting regulatory requirements for potable water.

Other plastics like polypropylene, polycarbonate, or polystyrene aren’t typically used for standard water service piping due to less favorable performance under potable-water conditions, temperature, or pressure, making them far less common choices in typical distribution systems.