Why Is My House Getting Brown Water?

Reviewed 2026-07-30 · How we research

Warning signs of brown water

• Water that is brown, orange or rust-colored from one or more taps
• Discoloration appears only in hot water, not cold
• Brown water follows a period of municipal water main work nearby
• Rust-colored staining in tubs, toilets or on laundry

Most likely causes of brown water, ranked

1. 1. Corroding galvanized steel supply pipe

   Most common in homes built before 1960 with original piping

   Galvanized steel pipe has a zinc coating that erodes over 40–60 years, exposing the steel underneath to corrosion. Rust flakes off the interior pipe wall and travels directly into tap water, and this affects both hot and cold lines fed from the same corroding section.

   10-minute self-test: Run cold water from an outdoor hose bibb, which is often closest to the street supply, for two minutes; if it runs brown too, corrosion is likely in the main supply piping rather than isolated to the water heater.

   This cause is not a DIY repair — it needs a licensed plumber.

2. 2. Sediment buildup inside an aging water heater tank

   Very common — affects hot water only

   Rust and mineral sediment collect on the tank floor over years, and when the anode rod inside a steel tank depletes, corrosion accelerates and rust particles enter the hot water supply. This shows up exclusively in hot water taps while cold water runs clear.

   10-minute self-test: Run only hot water at a sink for one minute. If it is brown while cold water from the same tap runs clear, the water heater is the source.

   This cause is not a DIY repair — it needs a licensed plumber.

3. 3. Municipal water main break or flushing nearby

   Common and temporary

   When a water main breaks or the utility performs hydrant flushing, sediment that has settled in the distribution pipes over years gets stirred up and pushed into homes on that section of the system. This typically resolves within hours to a day as the utility flushes the line.

   10-minute self-test: Check your water utility's website or call their customer service line to ask about recent main work or flushing in your area, which confirms this as the cause.

4. 4. High iron or manganese content in well water

   Common for homes on private wells

   Groundwater naturally high in dissolved iron or manganese turns brown or orange as it contacts air and oxidizes, a process the EPA notes is a common aesthetic (not typically health-based) well water issue. This tends to be a persistent, recurring pattern rather than a one-time event.

   10-minute self-test: Fill a clear glass with water and let it sit for 30 minutes; iron-laden well water often develops visible rust-colored sediment or a film as it oxidizes.

   This cause is not a DIY repair — it needs a licensed plumber.

5. 5. Recently disturbed plumbing after repair work

   Less common, situational

   Any recent plumbing repair, valve replacement or fixture installation can dislodge rust and sediment that had settled in the pipe over years, sending a temporary slug of discolored water through the lines closest to the work.

   10-minute self-test: If brown water started immediately after a plumber worked on the system, it likely clears within a day as the disturbed sediment flushes through.

Your 10-minute check list for brown water

1. Compare hot versus cold water color from the same tap
2. Check an outdoor hose bibb to isolate house piping from the water heater
3. Contact your water utility about recent main work
4. Let a glass of water sit to check for settling sediment

What it costs to fix brown water

See the full cost breakdown for this repair →

DIY fixes for brown water

• Flush cold taps for a few minutes

  If brown water follows municipal main work, running cold taps for several minutes often clears sediment that entered from the street side of the supply.

• Flush the water heater tank

  Attach a hose to the drain valve and flush several gallons after shutting off the cold supply, which removes loose sediment causing hot-water-only discoloration.

• Install a whole-house sediment filter

  A 5-micron sediment filter at the main supply line catches rust particles before they reach fixtures, which is a reasonable interim fix while planning pipe repair or replacement.

Mistakes to avoid with brown water

• Drinking or cooking with visibly brown water until the source is identified
• Ignoring persistent brown water from galvanized pipe, since ongoing internal corrosion can eventually cause pinhole leaks
• Delaying anode rod replacement on a steel water heater tank, which accelerates tank failure

Where homeowners waste money on brown water

• Buying a whole-house filtration system before confirming whether the source is the water heater alone, which a $150 flush might resolve
• Replacing the entire water heater when only the anode rod needs replacement

When to call a licensed plumber about brown water

What a licensed plumber actually does on this job →

How to prevent brown water coming back

• Replace galvanized steel supply piping proactively once it reaches 40–50 years of age
• Flush the water heater tank annually to prevent sediment accumulation
• Test well water annually for iron and manganese content
• Sign up for utility notifications about planned main work in your area

Why Is My House Getting Brown Water — questions homeowners ask

Sources used for brown water

• EPA — Secondary Drinking Water Standards for Iron and Manganese
• American Water Works Association — Main Flushing and Water Quality Guidance
• U.S. Department of Housing and Urban Development — Galvanized Pipe Lifespan Reference