Why Brown Water Appears in Faucets
Brown or rusty water coming from your faucets is one of the most alarming plumbing symptoms a homeowner can
experience. While it often looks dangerous, the cause is usually related to sediment, rust, or minerals inside
your plumbing system—not contamination. Still, it’s important to diagnose the issue quickly to protect your
pipes, fixtures, and appliances.
Discolored water can appear suddenly, similar to how a
sudden pressure drop
or other whole‑home symptoms show up without warning. The key is identifying whether the problem is coming from
inside your home or from the municipal water supply.
Common Causes of Brown Water Coming From Faucets
Several issues can cause tap water to turn brown. The most common include:
1. Rust Inside Old Galvanized Pipes
Homes with older galvanized steel pipes often experience internal corrosion. As rust flakes off, it mixes with
water and creates a brown or reddish tint. This discoloration may appear only in certain fixtures or only when
the water is first turned on.
2. Sediment Disturbance in the Municipal Water Supply
City water lines can stir up sediment during hydrant flushing, water main breaks, or heavy construction. When
this happens, brown water may appear throughout the entire neighborhood. This type of discoloration usually
clears within a few hours.
3. Water Heater Sediment Buildup
If brown water appears only when using hot water, the water heater is the likely source. Sediment collects at
the bottom of the tank over time, especially in areas with hard water. When the sediment gets stirred up, it
discolors the water.
4. Corroded or Failing Water Heater
A failing anode rod or internal corrosion can cause rusty hot water. If the water heater is more than 10 years
old, brown water may be an early warning sign that the tank is nearing the end of its lifespan.
5. Recent Plumbing Work
If you recently repaired pipes, replaced fixtures, or experienced a clog, sediment may have been loosened inside
the plumbing system. This can temporarily discolor the water.
How to Diagnose the Source of Brown Water
Use this simple process to narrow down the cause:
- Check whether the discoloration affects hot water, cold water, or both.
Hot water only = water heater issue.
Both = pipe corrosion or municipal disturbance. - Test multiple faucets.
If only one fixture is affected, the problem is localized. - Run the water for 2–3 minutes.
If the water clears, sediment was likely stirred up temporarily. - Check with neighbors.
If they also have brown water, the issue is coming from the city supply. - Review other symptoms.
If you’re also experiencing
low pressure throughout the house,
the issue may be affecting your entire plumbing system.
If you’re unsure what your symptoms mean, the
Symptoms Index can help you compare patterns and narrow down the cause.
How to Fix Brown Water Coming From Faucets
Once you’ve identified the likely source, use the appropriate fix below:
1. Flush Your Plumbing System
Run cold water from the bathtub faucet (the highest‑flow fixture) for 5–10 minutes. This helps clear sediment
from the main line. Avoid using hot water during this process so you don’t pull sediment into the water heater.
2. Flush the Water Heater
If the discoloration appears only in hot water, drain and flush the water heater to remove sediment. This should
be done annually to extend the life of the tank.
3. Replace Old Galvanized Pipes
If rust is coming from inside your home’s plumbing, replacing old galvanized pipes with copper or PEX is the
long‑term solution. This also improves water pressure and reduces future leaks.
4. Contact Your Water Utility
If the issue is neighborhood‑wide, your water provider can confirm whether hydrant flushing or a water main
repair is underway. They may also advise you on safe flushing procedures.
When to Call a Plumber
If brown water persists for more than 24 hours, or if it appears alongside symptoms like
water pressure surging,
it’s time to call a professional. Persistent discoloration can indicate pipe failure, water heater corrosion, or
a developing leak.
For next steps, visit the
Start Here page or reach out through the
Contact page for guidance.
Is Brown Water Safe?
In most cases, brown water is caused by rust or minerals—not harmful contaminants. However, you should avoid
drinking or cooking with discolored water until the issue is resolved. Rust can stain laundry, fixtures, and
appliances, so avoid running the dishwasher or washing machine during discoloration events.
For more information on water quality and safety, the U.S. Environmental Protection Agency provides helpful
resources at
EPA.gov.