Why Is My Water Orange, Brown, or Leaving Rust Stains?

Orange or brown water can be alarming, especially when it marks a sink, tub, laundry, or toilet. Iron is one possible cause, but discoloration can also come from sediment, corrosion, disturbed plumbing, or work on the water main. Color is evidence that something changed; it is not a laboratory result.

Start by noting where and when the color appears. Does it affect hot and cold water? Every fixture or just one? Did it begin after utility work, plumbing repairs, heavy rain, or well maintenance? Is it intermittent or persistent? If you are on municipal water, check for utility notices and contact the water provider. If you use a private well, test the water and inspect the well system through qualified professionals.

The right treatment depends on the constituent and its form. Iron can be dissolved or particulate; manganese and sediment may also cause staining or discoloration. A cartridge that catches suspended particles may not address dissolved iron. Oxidation and filtration systems require correct design and operating conditions. A softener may be appropriate in some water conditions but should not be treated as a universal iron solution.

For private wells, the CDC recommends testing when water’s taste, smell, or appearance changes, and at least annually for specified indicators. CDC well-testing guidance (opens in a new tab) If the water is suddenly discolored after a service disruption, seek advice from the utility before assuming a home filter is the answer.