Pipe Materials for Plumbing & Drainage: Copper vs Plastic (Los Angeles Guide)

Choosing between copper and plastic piping is one of the most important decisions in plumbing & drainage projects, especially in Los Angeles where water chemistry, aging housing stock, and earthquake awareness can influence long-term performance. Copper has a long reputation for durability and heat tolerance, making it a common choice for hot and cold water supply lines. It handles UV exposure better than many plastics and can be a solid option for exposed runs. However, copper is typically more expensive, labor-intensive to install, and may be vulnerable to pinhole leaks in certain water conditions or in older systems with galvanic corrosion. Plastic piping includes PEX for supply lines and PVC/ABS for drainage and venting. PEX is flexible, quick to install, and often reduces the number of fittings—helpful in remodels where routing through walls is tight. It also performs well in seismic areas because it can flex rather than crack. PVC and ABS are widely used for drains because they are lightweight, corrosion-resistant, and cost-effective. The trade-offs: plastics can be sensitive to UV exposure, and improper support or poor workmanship can lead to noise, movement, or premature leaks at joints. For many Los Angeles homes, a hybrid approach works best: copper or PEX for water supply depending on budget and access, and PVC/ABS for drainage where permitted by local code. Always confirm material approvals, insulation needs, and pressure requirements with a licensed plumber, and consider water quality testing if you are experiencing corrosion, discoloration, or recurring leaks.