What is the Poly B failure rate in Canada?
The straight answer
No authority publishes a Canadian failure-rate statistic. What is documented: an estimated 700,000 Canadian homes have Poly B, buried service lines failed after roughly 25 years in a municipal program, and degradation cannot be assessed visually.
The longer version
Nobody publishes one, and we won’t invent one. The grounded facts: insurance risk engineering estimates Poly B in as many as 700,000 Canadian homes; Ontario’s Durham Region replaced buried Poly B service lines en masse after roughly 25-year failures; and the degradation is internal, so failure arrives without visible warning. Any percentage you see on a contractor site traces to nothing. The failure chapter carries the sources.
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Grounding
This answer summarizes material sourced in full on the chapter pages it links. If the facts change, the chapter changes first and this answer follows.
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