Why Is My Water Rusty or Brown?

This is one of the most alarming things a homeowner can experience — you turn on the tap and brown or orange water comes out. It’s unsettling, and for good reason.

The short answer: something upstream is corroding. In most cases, that means your own home’s pipes. In some cases, it could be the municipal water main in your street. Either way, it requires attention.

Rusty water isn’t just an aesthetic issue. Iron and other corroded metals in your water supply can:

• Stain your sinks, toilets, and laundry
• Taste and smell metallic or sulfuric
• Damage appliances like water heaters and dishwashers
• Indicate reduced pipe diameter from buildup, causing low water pressure
• Signal that complete pipe failure — or a major leak — may be coming

In our experience, homeowners in Sandy who call us about rusty water have often been dealing with it for months before reaching out. By that point, the corrosion is usually well advanced.

The #1 Cause: Galvanized Steel Pipes

If your home was built before 1970, there’s a good chance it still has its original galvanized steel pipes. Galvanized steel was the standard for residential plumbing throughout the early and mid-20th century.

Here’s the problem: galvanized pipes have a zinc coating that was supposed to protect them from rust. Over time, that coating wears away — starting from the inside. Once exposed, the steel beneath begins to corrode rapidly.

What we’ve seen in older Sandy-area homes is a pattern: galvanized pipes that look fine on the outside are completely clogged with rust, scale, and mineral buildup on the inside. The pipe walls get thicker with deposits while the actual opening for water gets smaller and smaller.

This buildup does two things: it releases rust particles into your water supply, and it severely restricts flow — which is why rusty water and low water pressure in older homes almost always go hand in hand.

6 Pipe Problems That Cause Rusty Water

Galvanized steel is the most common culprit, but it’s not the only one. Here are the six most common pipe-related causes of discolored water that we diagnose in the field:

Hot Water vs. Cold Water: What the Difference Tells You

One of the first questions we ask when a customer calls about rusty water is: is it the hot water, cold water, or both?

The answer narrows down the cause significantly:

Many homeowners in our experience assume rusty hot water means a water main problem. In reality, a corroded water heater is almost always the culprit when the issue is isolated to hot-only. We’ve replaced plenty of water heaters that were turning the water brown long before they completely failed.

Other Warning Signs That Match Rusty Water

Rusty water rarely shows up alone. In most cases, it’s part of a cluster of symptoms that together paint a clear picture of pipe deterioration. If you’re seeing rusty water alongside any of these, the pipe problems are likely well advanced:

• Low water pressure throughout the house — Scale buildup inside pipes narrows the diameter, reducing flow
• Red or brown staining in toilets, sinks, and tubs — Iron in the water leaves visible deposits on surfaces
• Metallic taste or smell — Iron, manganese, and other corrosion byproducts are detectable by taste and odor
• Frequent small leaks at joints and fittings — Corrosion typically progresses from the inside to the outside, eventually causing pinhole leaks
• Water that looks clear but leaves orange stains — Dissolved iron oxidizes when it contacts air or surfaces, appearing clean until it reacts
• Reduced hot water output — Sediment in the water heater reduces capacity and efficiency
• Banging or rattling pipes — Pipe deposits can contribute to water hammer and pipe noise

Is Rusty Water Dangerous to Your Health?

This is the question most homeowners ask right away — and it’s an important one.

According to the U.S. Environmental Protection Agency, iron is not considered a health hazard in drinking water at typical concentrations found in home plumbing. The EPA’s secondary drinking water standard for iron is 0.3 mg/L — a threshold set for aesthetic reasons (taste, smell, color) rather than immediate toxicity.

That said, there are real concerns worth knowing:

• Long-term consumption — While iron itself isn’t acutely toxic, drinking water with high iron levels over time is not recommended, especially for people with certain medical conditions
• Lead and other metals — In homes built before 1986, corroding plumbing systems may also leach lead from solder and fixtures. This is a genuine health concern, especially for children
• Bacterial growth — Corroded pipes with sediment buildup can harbor bacteria. Iron-oxidizing bacteria in particular thrive in rusty pipe environments
• Boiling doesn’t help — Unlike biological contaminants, boiling water will not remove heavy metals or iron

Our recommendation: if you’re seeing consistently rusty water, stop drinking from that tap until you’ve had the issue diagnosed. Filtered or bottled water is the safer choice in the short term.

How We Diagnose Rusty Water Problems

When we get a call about rusty or discolored water, we follow a systematic approach to identify the exact source before recommending any repairs. Here’s what that process looks like in practice:

1. Isolate the affected fixtures — We test hot and cold water at multiple points in the house to map where the discoloration starts and stops.
2. Check the water heater — We inspect the age, condition, and anode rod status of the water heater, since it’s the most common source of rust in hot water lines.
3. Visual inspection of accessible pipes — Under sinks, in utility rooms, and at the main shutoff, we look for visible corrosion, staining, or pipe material identification.
4. Camera inspection if needed — For deeper supply lines in walls or under slabs, a pipe camera lets us see inside without tearing into walls unnecessarily.
5. Water test — For thorough diagnosis, we can recommend a water quality test that measures iron levels, pH, hardness, and the presence of other contaminants.
6. Review pipe age and material — We identify when the home was built and what materials were used, cross-referencing with known replacement timelines for those materials.
7. Recommend targeted repair or full repiping — Based on what we find, we’ll tell you honestly whether a targeted fix addresses the issue or whether the whole system needs replacing.

One thing we commonly find: the rusty water is just the most visible symptom. The underlying deterioration is usually more widespread than the customer realized. What looks like one bad pipe is often a system-wide issue.

When Rusty Water Means It’s Time to Repipe

Not every case of rusty water requires a full repiping. But there are clear indicators that tell us the system has reached the point where partial fixes won’t solve the problem:

The decision point we explain to every customer is this: galvanized pipes don’t fail in one spot and stay fine everywhere else. Once corrosion starts, it progresses throughout the system. Fixing one section buys time, but the other sections are close behind. At some point, the cost of repeated repairs exceeds the cost of repiping.

If your home has original galvanized pipes and you’re seeing rusty water, chances are you’re past that point. We’re happy to walk you through the math so you can make an informed decision. Learn more about your options on our older home plumbing repair service page.

What Replaces Galvanized Pipes?

When we repipe a home to solve rust and low-pressure issues, we almost always replace galvanized steel with PEX (cross-linked polyethylene) tubing. Here’s why:

We also install copper in situations where local code requires it or where the homeowner prefers it. Copper is an excellent material — it just comes at a higher material and labor cost than PEX. For most residential repiping projects, PEX is the practical choice. Learn more in our guide to galvanized pipes vs. modern plumbing materials.

What Happens If You Ignore Rusty Water?

We get this question a lot: “What’s the worst that can happen if I just live with it for now?”

Here’s the honest answer — it depends on how far along the corrosion is. But in most cases, ignoring rusty water leads to one or more of these outcomes:

• Pipe failure and flooding — Corroded galvanized pipes eventually develop pinhole leaks, then larger cracks. A burst pipe inside a wall or under a floor can cause catastrophic water damage
• Appliance damage — Sediment and mineral deposits from rusty water clog water heaters, dishwashers, and washing machines, shortening their lifespan significantly
• Staining that won’t come out — Iron stains on porcelain, grout, and tile are extremely difficult to remove and often require professional treatment or replacement
• Higher repair costs over time — Every leak you patch on a failing galvanized system adds cost without solving the underlying problem
• Home sale complications — A home inspection that reveals galvanized pipes and rusty water is a red flag for buyers and can complicate or kill a sale
• Mold risk — Slow leaks from deteriorating pipes inside walls create moisture — the foundation for mold growth. Learn more about how plumbing leaks cause mold problems

Signs Your Pipes Need Attention Right Now

Some situations call for a faster response. Call a plumber sooner rather than later if you’re seeing any of these in combination with rusty water:

• Water pressure has dropped noticeably in the last 6–12 months
• You’ve had two or more leaks repaired in the past 2 years
• Your home was built before 1960 and has never been repiped
• The discoloration is persistent — it doesn’t clear after running the tap for several minutes
• You see visible rust staining under sinks or around pipe fittings
• Water has an obvious metallic or sulfur smell
• You’re planning to sell the home in the next few years

If several of these apply to your home, it’s worth getting an assessment to determine if your home needs repiping before a small problem becomes an emergency.

Frequently Asked Questions

The Bottom Line on Rusty Water

Rusty or discolored water is one of the clearest warning signs your home’s plumbing system is giving you. It means something is corroding — and in older homes, it almost always points to galvanized steel pipes that have reached the end of their lifespan.

The good news: this is a solvable problem. Modern PEX repiping restores clean water, proper pressure, and peace of mind — usually in one to three days for a typical home. The longer you wait, the more damage the corroding pipes can cause downstream.

If you’re in Sandy, Draper, South Jordan, or anywhere in Salt Lake County and you’re dealing with rusty water, give us a call. We’ll take a look, give you an honest diagnosis, and walk you through your options without any pressure.