What causes rusty water from taps?

Rusty water from your taps is typically caused by iron corrosion in your plumbing system, either from aging galvanized steel pipes in your home or iron deposits in the municipal water supply. In Toronto homes, this is most commonly seen in properties built before 1960 that still have original galvanized plumbing.

The most frequent culprit is galvanized steel water lines that have corroded over time. These pipes were standard in Toronto homes through the 1950s, and after 50-70 years, the protective zinc coating wears away, exposing the steel underneath to oxidation. When water sits in these pipes overnight or during periods of non-use, iron particles dissolve into the water, creating that distinctive rusty color and metallic taste.

Municipal supply issues can also cause rusty water throughout Toronto neighborhoods. The city occasionally flushes water mains or performs maintenance that can stir up sediment in the distribution system. Toronto Water typically issues advisories when this occurs, and the discoloration usually clears within a few hours of running taps.

In Toronto's older neighborhoods like Cabbagetown, The Beaches, or High Park, century homes often have a mix of original galvanized pipes and newer copper or PEX sections. The rusty water may only appear from certain taps, indicating localized pipe corrosion rather than a whole-house issue.

Hot water that's consistently rusty usually points to a failing water heater tank. The steel tank develops rust internally, and this is more noticeable with hot water since heat accelerates the corrosion process. Water heaters in Toronto typically last 8-12 years before showing signs of internal rust.

Professional assessment is crucial because rusty water can indicate serious plumbing issues that affect water pressure, cause leaks, or contaminate your water supply. A licensed plumber can determine whether you're dealing with isolated pipe sections, whole-house repiping needs, or water heater replacement.

Next steps: Run cold water for 10-15 minutes to see if it clears - if not, contact a plumber immediately. If only hot water is rusty, have your water heater inspected. For persistent issues affecting multiple taps, you'll likely need pipe replacement, which in Toronto typically ranges from $3,000-$8,000 for partial repiping or $8,000-$15,000 for whole-house copper or PEX installation, depending on your home's size and accessibility.

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