Quick answer
Yellow shower water is most often caused by rust, sediment or dissolved minerals. The usual suspects are aging iron or galvanized pipes, sediment or rust inside a water heater, work or flushing on the city water system, and (with private wells) iron, manganese or natural organic matter called tannins. Checking whether the color appears in hot water, cold water or both is the quickest way to narrow things down.
Can you shower in yellow water?
Many sources describe yellow water caused by rust or sediment as mostly a cosmetic and nuisance problem, but you cannot be certain of the cause or contents just by looking. A conservative approach:
- A brief shower in lightly tinted water is generally not seen as a serious risk for most people, but if you have sensitive skin, a skin condition, or are bathing an infant, it is reasonable to wait until the water clears.
- Do not drink or cook with discolored water.
- Rust can stain light-colored towels, laundry and porcelain, so avoid washing whites until it clears.
- If the water has a strong odor, looks oily or cloudy, causes rashes, or anyone becomes ill, stop using it and call your water utility or a health professional.
If your home is served by a private well, test the water with a certified laboratory so you know what is in it.
What causes yellow shower water
Rusty pipes in the house
Older iron and galvanized steel pipes corrode over time, and rust can break loose. This tends to be most noticeable when the water has been sitting, for example first thing in the morning, and may clear after the water runs for a while.
Water heater sediment or rust
If only the hot water is yellow, the water heater is a likely cause. Sediment settles at the bottom of the tank and a corroding tank or anode rod can add rust.
City water work
Main breaks, repairs, hydrant flushing or construction can stir up sediment in municipal pipes. This usually affects the whole house at once and often fades within hours to days.
Well water minerals and tannins
Private wells may carry dissolved iron or manganese, or tannins from decaying plant matter, any of which can tint water yellow or brownish.
The shower itself
Sometimes the stain is not in the water supply. A scaly or rusty showerhead, a rusty shower arm, or old tub fixtures can add color to the first flow. Collect water in a clean white cup to see the true color.
How to find the source
- Collect a sample. Run the shower for a minute and fill a clear glass to judge the color.
- Run it longer. If it clears in a minute or two, local rust in the shower plumbing or the pipes is likely.
- Check hot versus cold. Fill separate glasses from the hot and cold taps at a sink. Only hot is yellow: look at the water heater. Both: look at the supply or main pipes.
- Test other taps. If every tap is yellow, the cause is upstream of the shower.
- Ask neighbors and call the utility. If the neighbors have the same issue, it is likely a municipal event.
- Consider recent events. Plumbing work, a long vacancy, or heavy rain on a well system can all change the water.
How to fix it by cause
- City event: wait and flush the cold lines for a while once the utility says work is done. Avoid using hot water until the cold runs clear, so discolored water is not pulled into your water heater.
- Rusty pipes: flushing helps short term. For recurring problems, a plumber can inspect the piping and recommend repair or replacement (see replumbing a house). Aging supply pipes can also cause low water pressure.
- Water heater: flush the tank following the manufacturer’s directions. This involves hot water and gas or electric controls, so turn off power or set gas controls as instructed and let the water cool, or hire a plumber. An old, heavily rusted tank may need replacing, and may leak (see water heater tank leaking from the bottom).
- Well water: have it tested, then choose treatment such as an iron filter based on results.
- Showerhead or arm: clean or replace it. Descaling with vinegar can help with mineral buildup; check your fixture finish first.
Why is my bath water brown?
Brown bath water usually has the same causes as yellow water, with the shade depending on how much rust or sediment is present. Darker color often means more particles. Our guide to light brown water from the faucet covers the brown end of the range, including whether a pipe burst is likely.
Should you call a plumber?
Call a licensed plumber or other professional if:
- The water stays yellow or brown after flushing for a reasonable time, or the problem returns regularly.
- Only hot water is discolored and the water heater is old or you do not feel comfortable servicing it.
- You see signs of a leak, such as low pressure, wet spots, or a rising water bill.
- You have an older home with galvanized or lead plumbing.
- The water has an odd smell, taste or texture.
Call your water utility if neighbors are affected or if the whole house changed suddenly. If you are on a well, call a certified water testing lab or well professional.
Related guides
- Light brown water from the faucet
- Is your shower water hard water for white scale and mineral buildup, which is different from yellow or rust-colored water.
FAQ
What causes a shower to turn yellow?
Usually rust, sediment or minerals from pipes, the water heater, the city supply or a private well. Check hot versus cold and other taps to find out which.
Can I shower in yellow water?
Often it is considered a nuisance rather than a major risk, but be cautious. Avoid it for infants and sensitive skin, do not drink it, and stop if you notice odor, irritation or illness.
Should I call a plumber for yellow water?
Call if it persists, only affects hot water with an aging heater, comes with leak signs, or your home has old galvanized piping.