Baltimore receives water from three reservoir systems that undergo treatment before distribution. The resulting water chemistry includes chlorine disinfection and pH adjustment that falls within acceptable ranges but still affects piping materials over decades. Homes in older neighborhoods often have galvanized steel supply lines that can increase water acidity through corrosion byproducts. This creates conditions where copper develops pinhole leaks faster than in homes with newer service lines. PEX remains unaffected by these pH variations but requires proper connection to existing copper stub-outs using dielectric unions or brass transition fittings to prevent galvanic corrosion at joint points.
Baltimore's construction landscape spans three centuries of building methods. Rowhouses built before 1920 typically feature plaster walls over wood lath, making pipe replacement more invasive than in drywall construction. These homes benefit from PEX's flexibility, which allows routing through existing wall cavities with fewer access points. However, historic district regulations sometimes require maintaining original materials during renovations, making copper the only approved choice for visible plumbing. Keystone Plumbing Baltimore maintains relationships with city inspectors and preservation officials who help navigate these requirements. We understand which materials meet code in various Baltimore jurisdictions and how to document installations for future homeowners.
