What causes orange stains from well water, and how do you fix them?

Orange stains from well water are almost always caused by iron, and the fix is to test your water, then match the right treatment system to the type and amount of iron you actually have.

If you own a well in Central Florida, you have probably seen the signs: rusty rings in the toilet bowl, orange streaks in the shower, laundry that comes out dingy, or sprinkler stains climbing up the side of the house. We have been working on wells and water in Polk County since 1950, and iron is one of the most common complaints we hear. Below we explain where it comes from, why it stains, and how to stop it for good.

What Causes Orange Stains From Well Water?

Groundwater picks up minerals as it moves through soil and rock. Much of Central Florida's subsurface contains iron-bearing sands and clays. Water that sits in those layers dissolves some of that iron and carries it straight into your well.

The staining itself happens when dissolved iron meets oxygen. Once the water leaves the pipe and hits air, the iron oxidizes and turns into tiny orange-brown particles, which is basically rust. Those particles settle onto porcelain, tile, fabric, concrete, and stucco.

The U.S. EPA sets a secondary (cosmetic) guideline for iron at 0.3 milligrams per liter. Water above that level often starts leaving visible stains, and many Florida wells test well above it.

The Different Types of Iron in Well Water

Not all iron behaves the same way, and that matters when you choose a treatment:

• Ferrous iron ("clear water iron"). The iron is fully dissolved. Water comes out of the tap looking clear, then turns orange or leaves stains after it sits or dries.
• Ferric iron ("red water iron"). The iron has already oxidized before it reaches the faucet. Water looks cloudy, orange, or rusty right out of the tap.
• Iron bacteria. Naturally occurring bacteria feed on iron and produce a slimy orange or reddish buildup. You may see it in the toilet tank or notice a swampy smell. This type can clog pumps, screens, and irrigation heads.

Other Sources of Orange or Rusty Water

Sometimes the problem is not the aquifer at all. If your water was fine for years and suddenly turned rusty, look at the equipment:

• Corroding steel pipe or well casing. Older wells with steel components can rust from the inside.
• A failing pressure tank. Some older galvanized or bare steel tanks rust internally and dump rust into the system.
• Low pH (acidic) water. Acidic water can eat away at metal plumbing and add iron as it goes.

A sudden change like this is a good reason to have us look at the pump and tank, not just the water. Our pump repair and installation team handles pressure tanks and every common pump type.

How to Fix Orange Stains From Iron in Well Water

The right fix depends on what is in your water, how much of it there is, and whether you are treating household water, irrigation water, or both. Guessing usually means buying the wrong equipment.

Step One: Test the Water

Before anything else, get a proper test. We offer on-site water testing to identify what is actually in your water: iron levels, the form of iron, hardness, pH, and whether hydrogen sulfide (the rotten-egg smell) is also present. Iron and sulfur often show up together in Florida wells, and a system built for one may not handle the other.

Step Two: Choose the Right Treatment System

Here are the main options we install through our water filtration and treatment service:

• Iron removal systems. These oxidize dissolved iron and then filter it out before it reaches your fixtures. They are the go-to choice for moderate to high iron levels in household water.
• Iron-sequestering systems. Instead of removing iron, these feed a treatment that keeps the iron dissolved so it does not oxidize and stain. Sequestering works best at lower iron levels and is a common approach for irrigation water.
• Chlorination systems. Chlorine oxidizes iron so it can be filtered, and it also kills iron bacteria. Chlorination is often paired with a filter and is a strong choice when bacteria or sulfur odor is part of the problem.
• Water softeners. A softener can remove small amounts of clear water iron along with hardness minerals. On its own, it is usually not enough for heavy iron, and too much iron can foul the softener resin.

Many homes end up with a combination, such as a chlorination system followed by a filter and a softener. Testing tells us which combination makes sense.

Orange Sprinkler Stains on Driveways, Walls, and Sidewalks

In Central Florida, irrigation is where iron stains get the most visible. A shallow irrigation well can save a lot compared to metered municipal water, but if the water carries iron, every sprinkler cycle paints a little more orange onto your house, fence, sidewalk, and pool deck.

Ways to address it:

• Treat the irrigation water. An iron-sequestering system on the irrigation line can greatly reduce new staining.
• Adjust spray patterns. Heads that hit walls, driveways, and sidewalks should be redirected or replaced. Our irrigation repair and installation crew keeps a warehouse stocked with hard-to-find heads, valves, and controller parts.
• Check the well itself. Some areas of Polk County have more iron in the shallow water table than others. If you are planning a new 2-inch shallow irrigation well, we can give you a suitability assessment based on what we know about local conditions.

Cleaning Existing Iron Stains

Treatment stops new stains, but it does not erase old ones. For fixtures and laundry, look for cleaners made specifically for rust and iron stains, usually labeled for that purpose. Avoid chlorine bleach on iron-stained laundry, because it can set the stain permanently.

For concrete, pavers, and stucco, use a rust remover rated for that surface and test it in a small area first. Always follow the product label and wear proper protection.

What you should not do yourself: open up the pressure tank, work on the pump's electrical controls, or try to disinfect or treat a drilled well. Those jobs involve high-voltage wiring, stored pressure, and equipment that is easy to damage. Call us for any of that.

Why Work With One Company for Pump and Filter Work

Iron problems sit right where the well equipment and the water treatment meet. A clogged pump screen, a rusting tank, and an undersized filter can all look like "orange water." Most companies only handle one side of that, so you end up with two contractors pointing at each other.

We do both pump and filter work. Our full-line machine shop rebuilds pumps and turbines in-house, and we carry Goulds, Sta-Rite, Grundfos, and Schaefer pumps, new and used. New pump and tank installations come with the standard manufacturer's warranty. We are a Licensed Water Well Drilling Contractor and a member of the Florida Ground Water Association, and our shop is right here in Winter Haven.

Get Your Iron Problem Diagnosed

If you are seeing orange stains in your sinks, laundry, or on your house, or if your water suddenly turned rusty, call Dunham Well Drilling at (863) 965-2881. Our office is open Monday through Friday, 7:30 AM to 4:30 PM, and our 24/7 answering service takes calls any time, with calls returned within 48 hours. With 76 years in Polk County and the ability to test your water, service your pump and tank, and install the right treatment system under one roof, we can find what is causing the stains and fix it at the source.