Brown or yellow tap water: what to do

The color is a clue. Your supplier's instructions decide the next step.

The answer in 2 lines. Don't drink obviously brown or yellow water or use it for cooking, ice or baby formula while the cause is unresolved. Check your water supplier's current notices, compare cold and hot water, and ask whether neighbors are affected. Sediment disturbed by water-main work and corrosion inside buildings are common explanations, but color alone cannot establish safety. Follow local flushing instructions rather than running every tap indefinitely.

Start here

Set aside discolored water for drinking and food preparation. Use bottled water or another confirmed safe source while checking the cause.
Look for a current notice for your address. Use the supplier identified on your bill; if you don't know the supplier, use EPA's local drinking-water information and choose the provider or state information links.
Compare cold and hot taps without tasting the water. Note whether the problem affects one fixture, the whole home or neighboring homes.

Stop: danger

A water advisory takes priority: a do-not-drink notice and a do-not-use notice have different restrictions. Use the CDC advisory guide to identify the notice type, then follow your local instructions. Boiling does not make chemically contaminated water safe.

What the pattern can tell you

What you notice	Possible explanation	Next step
Sudden discoloration at several cold taps and nearby homes	Disturbed sediment following main work, a break or hydrant use	Report it to the supplier and request instructions
Recurring discoloration limited to your building	Corroding interior plumbing	Notify building management or arrange a plumbing assessment
Only hot water is rusty	Water-heater or hot-water plumbing corrosion	Have the hot-water system checked
Milky water clears while standing in a glass	Often escaping air bubbles	Report persistent cloudiness or other changes

These patterns guide the investigation; they are not a water-quality test. Photograph a clear glass against a light background and record which taps were affected.

What not to do

Boiling discolored water and assuming that removes chemicals or metals.
Running hot water to flush a problem in the cold-water supply.
Starting laundry while water is discolored: sediment can stain clothing.
Assuming clear water proves that every contaminant is absent.

Flush only as your supplier directs

Where the supplier identifies temporary sediment and recommends flushing, follow its directions for the cold-water tap, duration and stopping point. If the color persists or returns, report that result instead of repeatedly running water without guidance. Avoid using affected appliances while investigating.

For example, New York City's water-shutoff guidance tells residents to let water become clear and cold before drinking or cooking after service work. Read the discoloration section if that describes your situation.

In New York City, use the official drinking-water complaint page, select the discolored-water report and supply your address and contact details. Elsewhere, use the provider information reached through EPA's directory above.

Check the report, then investigate your plumbing

Use EPA's Consumer Confidence Report page and select “Find your local CCR.” Read the latest available report for your actual water system and check its reporting year. It describes monitored water quality, but cannot explain a new event at your kitchen tap or replace a current advisory.

For recurring color inside a rental, send the landlord photographs and a written description. If the response is inadequate, use USAGov's tenant-rights guidance to find your state's housing resources. Repair obligations and complaint procedures vary.

If you have a private well, use the CDC's well-water guidance to review testing and treatment considerations. Choose treatment only after identifying the problem; a public-system report does not cover your well.

Good to know

For an explanation of milky water that clears, read Michigan's water-quality guidance and compare the appearance with its cloudiness section.
Use cold tap water for drinking and cooking once its safety is established. EPA's lead FAQ explains why hot tap water should not be used for drinking, cooking or formula.

Illustrative example: Jordan notices yellow cold water after street work in New York City. A neighbor sees the same change. Jordan checks the official notices, reports the discoloration and follows the city's flushing guidance. When the water clears, Jordan checks that no advisory remains before resuming drinking-water use.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on November 4, 2026, for the United States. Confidence: high for advisory precautions and official information routes; medium for possible causes, which require local investigation. Flushing instructions depend on the supplier and incident.