Which material is prohibited for use in underground plumbing lines in NYC?

Which material is prohibited for use in underground plumbing lines in NYC?

• A. CPVC
• B. Galvanized steel
• C. Cast iron
• D. Polyethylene

Answer: (B)

The use of galvanized steel in underground plumbing lines is prohibited in New York City primarily due to its susceptibility to corrosion when buried. Galvanized steel pipes are coated to prevent rusting; however, over time, this protective layer can deteriorate, particularly when in contact with moisture and soil. This corrosion can lead to leaks, pipe failure, and contamination of the water supply. In contrast, materials like CPVC, cast iron, and polyethylene have been approved for underground use because they offer greater resistance to corrosion and can maintain water quality without leaching harmful substances. Cast iron, for instance, is strong and durable, making it suitable for burying, while polyethylene is flexible, resistant to chemicals, and widely used for various plumbing applications, including underground installations.

The use of galvanized steel in underground plumbing lines is prohibited in New York City primarily due to its susceptibility to corrosion when buried. Galvanized steel pipes are coated to prevent rusting; however, over time, this protective layer can deteriorate, particularly when in contact with moisture and soil. This corrosion can lead to leaks, pipe failure, and contamination of the water supply.

In contrast, materials like CPVC, cast iron, and polyethylene have been approved for underground use because they offer greater resistance to corrosion and can maintain water quality without leaching harmful substances. Cast iron, for instance, is strong and durable, making it suitable for burying, while polyethylene is flexible, resistant to chemicals, and widely used for various plumbing applications, including underground installations.