Why is my hot water rusty colored?

Rusty-colored hot water is typically caused by corrosion inside your water heater tank or in the hot water pipes. This is a common issue in Ottawa homes, especially with older water heaters or homes with galvanized steel pipes.

The most likely culprit is sediment buildup and corrosion inside your water heater tank. Over time, minerals from Ottawa's moderately hard water settle at the bottom of the tank, and the tank's steel lining can develop rust spots. When the water heater fires up, it stirs up this rusty sediment, giving your hot water that brown or reddish tint. This problem is more common in tank water heaters that are 8+ years old or haven't had regular maintenance.

Galvanized steel pipes are another common cause, particularly in Ottawa homes built before 1980. These pipes corrode from the inside out, and the rust flakes mix with your hot water. You might notice the rusty color is worse first thing in the morning or after the water hasn't been used for several hours.

If only your hot water is rusty (cold water runs clear), the issue is almost certainly your water heater. If both hot and cold water are discolored, you likely have a pipe corrosion problem or a municipal water issue. In Ottawa, occasional rusty water can also result from water main work or seasonal changes in the city's water treatment process.

Don't ignore rusty hot water - it indicates your water heater may be nearing the end of its life, and continued corrosion can lead to tank failure and flooding. A licensed plumber can drain and flush your water heater, inspect the anode rod (which prevents corrosion), and determine if replacement is needed. In Ottawa's market, water heater replacement typically runs $1,500-$2,500 for a standard tank unit.

For a proper diagnosis of your rusty water issue, consider having Ottawa Pro Plumbing inspect your water heater and plumbing system - we can determine whether a simple flush and anode rod replacement will solve the problem or if it's time for a new water heater.