Rusty or discolored hot water may come from the water heater, such as rust or sediment inside the tank, but it can also come from corroded pipes or a disturbance in the city water supply. The quickest clue is whether the cold water looks the same.
Discolored water is common enough that many people have seen it at least once. Knowing where it comes from helps you decide whether the problem is in your water heater, your building’s plumbing or the water coming in from the street.
Start by Comparing Hot and Cold
Fill one clear glass with cold water and another with hot water from the same faucet. What you see can point you in a direction:
- Only the hot water is discolored: the water heater or the hot water piping is a more likely source.
- Both hot and cold are discolored: the cause may be in the building’s supply piping or outside the building.
- Only one faucet is affected: the problem may be in the pipes or fixture serving that faucet.
These are clues, not a diagnosis. More than one source can be involved at the same time.
How a Water Heater Can Discolor Water
In a storage tank water heater, minerals and sediment can settle at the bottom over time. Corrosion inside the tank or on its fittings can also add rust-colored particles to the water. When hot water is drawn, some of that material can come out of the tap.
Discolored hot water does not prove the tank is failing. But if it shows up along with leaking, rumbling noises or a drop in hot water, the heater should be looked at.
When the Source Is Outside the Heater
The NYC DEP drinking water FAQ explains that brown water can be linked to corrosion in building plumbing, rusting hot water heaters, water main breaks or repairs, construction and fire hydrant use. DEP suggests running the cold water for a few minutes if it has not been used in a while, and advises against drinking water that is clearly discolored.
If cold water is discolored throughout the building or on your block, you can report it to 311 so the city can follow up.
What to Do Next
Avoid drinking or cooking with discolored water until it runs clear. Do not try to drain the water heater or take parts off it, since the water inside is hot and under pressure. Note when the color appears and whether it clears after running the tap.
In apartment buildings, report the problem to the super or landlord, especially if neighbors see it too. Building staff can check shared equipment and arrange service.
If only your hot water looks rusty or cloudy, our team can check whether the water heater is the cause. Learn about our Bronx water heater repair or call (929) 209-6183.
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