Why Does Water Damage Copper Pipes Over Many Years?

Copper, while durable, can oxidize when in prolonged contact with water and oxygen. This reaction forms a protective layer called patina, which slows further corrosion. However, if the water chemistry is aggressive, this protective layer can fail. Over decades, this localized failure leads to thinning and pitting in the pipe wall.

Several factors determine how quickly corrosion occurs. Your water's pH level is a major player; highly acidic or alkaline water is more corrosive. The amount of dissolved oxygen and mineral content, like chlorides, also influences the rate. Even minor, consistent water exposure from condensation can contribute to the gradual degradation process.

Visible signs include green or white crusty deposits, called verdigris, around pipe joints and fittings. You may also see recurring pinhole leaks in the same pipe section. Low water pressure can result from significant mineral buildup or scale narrowing the pipe's interior diameter over many years.

If you see signs of corrosion or have an active leak, turn off your home's main water supply. This prevents further water damage. Document the issue with photos and notes for your insurance company. Then, contact a qualified plumber to assess and repair the faulty piping.

After the leak is fixed, water damage remains. Wet drywall, insulation, and framing need proper drying to prevent mold. Local water damage pros can inspect the affected areas with moisture meters. Their work involves water damage cleanup and necessary repairs. Policies vary, and your insurer decides what is covered.