Systems through time
Plumbing in older Canadian homes
How did plumbing change in Canadian homes?
Canadian home plumbing moved from lead and galvanized steel supply with cast iron drains, to copper through the mid-century, to polybutylene in some 1980s–1990s housing, and then to PEX. Supply and drain materials are often mixed within one house, so verify at several locations rather than assuming a single material from the construction year.
What this means
Era tells you which materials were available and typical, which frames the questions to ask about supply lines, drains and any service line to the street.
What it does not mean
It does not establish what is buried in walls or under slabs, and it says nothing about condition, water quality, or whether a municipal service line was replaced.
How to verify
- Have a licensed plumber identify supply material at the meter, in the basement, and at fixtures
- Ask the municipality about the service line material record for the address
- Consider a drain camera scope where original cast iron or clay may remain
- Request plumbing permit history for any renovation that moved fixtures
Plumbing by construction era
Swipe sideways to compare columns
| Era | Common at the time | Verify today |
|---|---|---|
| Before 1920 | Lead or galvanized supply, cast iron and clay drainage | Service line material record and whether any lead remains |
| 1920–1939 | Galvanized steel supply, cast iron drains | Whether replacement was partial or whole-house |
| 1940–1959 | Copper increasingly replaces galvanized | Mixed-material joints and drain condition |
| 1960–1969 | Copper supply; cast iron or ABS drainage | Drain condition by camera where original |
| 1970–1979 | Copper supply, ABS drainage widespread | Later fixture additions and venting adequacy |
| 1980–1989 | Polybutylene used in some regions alongside copper | Whether polybutylene is present and any replacement documentation |
| 1990–1999 | PEX and copper supply | Whether earlier polybutylene was fully or partially replaced |
Who can assess this
- Licensed plumber
- Municipal water utility for service-line records
- Accredited laboratory for water testing
Evidence note
- Sources
- Jurisdiction
- Canada (federal guidance); Canada (model code adopted provincially)
- Applies to
- Plumbing in Canadian residential buildings built roughly 1900–1999
- Last reviewed
- 2026-08
- Limitations
- Describes general Canadian practice by era. Requirements are set provincially and this page does not describe any specific property.
- What you should verify
- Permit and inspection history, service records, and assessment by the appropriate licensed trade.