Many homes around St. Louis, especially in the outer parts of the county and on older rural-edge lots, do not draw water from a city main. They rely on a private well. If you see orange stains, rust-colored particles, or a metallic taste, knowing where your water comes from is the first step, because the answer changes who you call, what you test for, and how you read the results.
Find out whether you have a well
Start with paperwork and a walk around the property. Look for these clues:
- A monthly bill from a water provider usually means city or district water.
- A round or square cap on a concrete slab, often in a yard, crawl space, utility room, or near the foundation, may mark a well.
- A large steel or fiberglass tank in a basement or utility room, sometimes with a pressure gauge, is often a pressure tank tied to a well pump.
- Closing papers or a home inspection report from when you bought the house may state the source directly.
If the answer is still unclear, your county assessor office or local building records office can often tell you how the property was connected when it was built.
Signs that point toward well iron
Iron can enter water from the ground at any depth. These patterns are common with iron in well water, but none of them proves the cause on its own:
- Water that looks clear from the tap but turns orange or cloudy after sitting in a glass or pitcher.
- Orange or brown staining in toilets, sinks, and tubs that returns soon after cleaning.
- Rust-colored sediment at the bottom of a bucket or in a water heater drain.
- Laundry that comes out with orange or brown spots, especially white fabrics.
- A metallic taste that is stronger on the first draw of the day.
What changes when the source is a well
A private well is your own responsibility, and its water quality can shift over time. Chemistry depends on the rock and soil layers the well draws from, the depth of the well, and the condition of the casing and cap. Heavy rain, spring melt, and dry spells can also change what shows up at the tap. A well that ran clear for years can start staining after nearby construction or a change in the pump.
Iron in a well often arrives with other minerals and sometimes with bacteria. Those are separate concerns with separate tests, so a color problem in a St. Louis well should not be assumed to be only iron.
Simple checks you can do yourself
- Fill a clear glass from the cold tap, let it stand for a while, and watch whether it changes color or leaves a film.
- Run the cold tap for a few minutes before the first use of the day, then compare that water with the first draw.
- Look at the well cap and its seal for cracks, gaps, or loose fittings, and check that the ground around it slopes away.
- Inspect the pressure tank and its gauge for leaks or rust on the outside, and note how often the pump seems to run.
- Keep a short log of when stains appear, which fixtures are affected, and whether rain or pump activity seems to line up with them.
When a lab test makes sense
A home kit can suggest whether iron is present, but it does not give a dependable reading on its own. For any decision about treatment, use a state-certified laboratory and ask which test methods it uses. If you are on a well in St. Louis, ask for iron, manganese, and bacteria testing at a minimum, and ask the lab how to collect the sample so the result is not skewed by a dirty bottle or a faucet that was not cleaned first.
Many public water suppliers publish an annual water quality report describing the treated water they send out. That report describes the supply leaving the plant, not the plumbing inside your own home or the water in your own well.
Deciding what to do next
- Confirm your source first, so you know which records, rules, and responsibilities apply to your home.
- Test the water with a method suited to that source, and keep the full lab report.
- Match the results to the staining pattern you have seen, and note anything that does not fit.
- If the results show more iron than you want to live with, ask a qualified professional for a written plan that explains the proposed approach and the reason for it.
- Compare several written estimates, and ask each one what they tested, what they recommend, and how they will confirm the result afterward.
Staining is a visible sign, but the water itself needs its own answer. Starting with your source and a proper test keeps the next decision grounded in what your St. Louis home actually draws from the ground.