Why Is My Water Rusty or Discolored?

Turning on the tap to brownish water is unsettling. The cause ranges from a harmless municipal flush to corroding pipes in your own home. Here's how to tell the difference.

Is it your home or the municipal supply?

If discolored water appears at every tap and clears within a few hours, it's often a municipal issue like hydrant flushing or a main repair. If it persists or affects only hot water, the problem is likely in your home.

Common causes

• Corroding galvanized pipes releasing rust
• A water heater with rusting interior
• Disturbed sediment in the supply line
• Municipal maintenance work

Hot water only?

If only the hot water is discolored, your water heater is the likely culprit, either from sediment or a corroding tank that may need replacement.