Which material is known for low cost and corrosion resistance in cold water systems?

• A. PVC — low cost and corrosion resistance
• B. PEX — flexible and heat resistant
• C. CPVC — chlorine resistance
• D. Copper — durability

Answer: (A)

For cold-water piping, you want a material that won’t corrode and won’t break the bank. PVC fits that need beautifully. It’s a plastic, so it doesn’t rust or corrode when exposed to typical potable-water chemistry, and it’s inexpensive to manufacture and install. Lightweight and easy to join with solvent cement, PVC keeps both material costs and labor costs low, which is a big advantage in residential and small commercial systems.

Other options have their own strengths but come with trade-offs. PEX offers flexibility and good resistance to certain service conditions, but its material cost is generally higher and it’s used in different layouts. CPVC can handle higher temperatures and chlorine exposure, but for standard cold-water service its higher cost isn’t necessary. Copper is very durable, yet its upfront price is higher and it can be sensitive to certain water chemistries, potentially increasing maintenance concerns.

So for a straightforward cold-water system where cost and corrosion resistance are the priority, PVC is the best choice.