Definition
Steel pipes coated with zinc to resist corrosion, used in older homes before 1970s. Galvanized pipes eventually corrode internally, causing problems.
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Galvanized pipes were standard in older homes and are still used in some applications. The zinc coating protects against rust, but over 40-50 years, the coating wears away and the steel underneath corrodes. Internal corrosion reduces water flow, causes discoloration, and can lead to leaks. Modern code no longer permits galvanized water supply lines. Replacement with copper or PEX is necessary in older homes. Inspectors identify galvanized pipes and assess condition.
Pro Tip
If a home has galvanized supply lines and you notice low water pressure, replacement is likely necessary.
Example
An older home in Ohio had severely corroded galvanized supply lines, causing very low water pressure and intermittent service. Complete replacement with PEX supply tubing cost $4,200 but restored adequate water pressure and quality.