Iron shows up in a lot of St. Louis homes, and it often comes up during a sale. An orange stain on a sink, a rust ring in a tub, or a water report with an iron line can make a buyer wonder whether the house has a problem worth fixing or just an ordinary water condition. This guide walks through what to check before you sign anything.
Start with the water source
The first question is where the water comes from. Most homes in St. Louis are served by a public water system, while homes outside the reach of city and county lines may rely on a private well. The source decides who is responsible for testing and treatment. On a public system, the provider publishes an annual water quality report that lists what it monitors, and iron is often among the items listed. On a private well, nobody tests the water for you, so the buyer or seller has to arrange it.
Read the records you can get
Ask the seller for any water test results, service records for a softener or filter, and past repair invoices for the pump, pressure tank, or water heater. Records show whether the problem has been noticed before and whether anyone tried to fix it. A missing record is not proof of a problem, but it means you should test the water instead of relying on memory.
Test the water yourself
A visual check tells you little. Iron can be dissolved in water and stay invisible until it oxidizes in the air, which is why water can run clear from the tap and turn orange later in a glass or sink. A laboratory test gives a real answer. Use a certified lab, ask for a test that reports total iron and any other metals the buyer cares about, and follow the sampling instructions closely. Take the sample from the cold tap that gets the most use, and let the water run as the lab directs. Home kits can screen for iron, but they are less precise than lab results, so use them to decide whether a lab test is worth the expense.
Look for clues in the house
Walk the house with a flashlight and check the places where iron tends to show up:
- Stains on the bottom of sinks and tubs, especially under the hot tap
- Orange film on toilet tanks or a ring in the bowl
- Staining around the water heater or on the floor beneath it
- Deposits inside faucet aerators and shower heads
- Orange material on any softener, filter, or sediment cartridge
Stains near the hot tap alone can point to the water heater or hot water lines rather than the supply. Stains on every fixture suggest the iron comes from the supply itself. Neither clue is conclusive by itself, but together they help you decide what to test next.
What a home inspection covers
A general home inspection typically notes visible staining and the condition of the water heater, pressure tank, and exposed plumbing. It usually does not test water quality. If the inspector flags staining, ask for a separate water test rather than assuming the inspection covered it. If the house uses a private well, ask whether the well, pump, and pressure tank were inspected as part of the sale.
Questions to ask the seller
- Has the water ever been tested, and can you see the results?
- Is there a softener, filter, or other treatment system, and when was it last serviced?
- Have you noticed color, staining, or buildup at any fixture?
- Was the water service line or supply piping changed or repaired?
Using the results
If a test confirms iron, get estimates from more than one qualified service company. Ask each one what it would treat, how it would verify the result afterward, and whether it would retest the water once any treatment is installed. Ask the seller how the expense would be shared if the work is handled as part of the sale. Do not accept a promise that a treatment system will solve every stain. Stains already on fixtures may need cleaning, and some will need replacing.