Polybutylene Supply Pipes
The water supply pipes are made from polybutylene.
OccasionalPlan for itWater supply pipes
Why it matters
Polybutylene is a plastic water pipe installed in many homes from 1978 to the mid-1990s. Disinfectants in public water can weaken it from the inside, and it can leak without warning.
How common is it?
Found in 10% of the homes HomeCloud evaluated, Sep 2025 to Oct 2026.
Counted by the finding's name on HomeCloud reports, so the true number can be a little higher.
How soon to fix it
HomeCloud reports list this as something to plan for rather than an emergency.
More plumbing resources
What kind of pipes do I have?How to tell copper, PEX, CPVC, polybutylene, galvanized steel and cast iron pipes apart, and which ones to plan to replace.Tank vs. tankless water heatersHow tank, tankless and heat pump water heaters work, gas vs. electric, sizing one for your household, and the brands you'll see most.How to find and use your water shutoffWhere the main water shutoff and the valves under sinks and toilets usually are, how to close them in a leak, and simple upkeep like flushing the water heater.
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