Overview
Galvanized Corrosion vs. Modern PEX-a and Type-L Copper
Many homes built across the San Francisco Peninsula between the 1940s and 1980s still rely on original galvanized steel or aging thin-wall copper water supply lines. Over decades, galvanized pipes suffer from heavy internal oxidation and mineral buildup, choking water flow to a trickle when multiple fixtures run simultaneously, while shedding reddish rust and metallic sediment into sinks, tubs, and drinking water.
A whole-home repipe replaces your entire potable water distribution network with modern, high-durability materials: American-made Type-L hard copper or Uponor ProPEX (PEX-a) cross-linked polyethylene. PEX-a uses cold-expansion fittings that can never slip or corrode, withstands seismic ground shifting without cracking, and resists aggressive chloramines present in Bay Area blended municipal water supplies.
Daso Plumbing specializes in clean, occupied-home repiping designed to minimize household disruption. Our technicians strategically open small, surgical access cuts in drywall or route lines through basements, crawlspaces, and attics, keeping your water service active overnight during multi-day projects. Every repiping project is fully permitted, inspected by local city building departments, and completed with professional drywall patching.