Pull a garden hose out of the shed in the spring, run the tap for a moment, and you may see a rust-colored or amber stream. In St. Louis, that can make a homeowner assume the whole house has iron in its water. Often the water inside is fine and the color comes from the hose, the outdoor spigot, or the pipe feeding that spigot. This guide walks through how to sort out which one it is.
Why Outdoor Water Can Look Different
Iron is a naturally occurring mineral. When water containing dissolved iron meets air, the iron can oxidize and turn orange or reddish brown. That is one reason water that looks clear when it first comes out can look colored after it sits in a glass or a bucket. Iron is a common subject in St. Louis water conversations, but iron is not the only possible source of color at an outdoor tap.
Outdoor fixtures have their own sources of rust. A hose sits in the sun, gets dragged across concrete and gravel, and is often left full of standing water. The metal ends can rust on the inside, and the rubber or plastic layers can leave a tint, especially when the hose is new or has been stored in a hot spot.
Test the Hose Alone
The fastest check is to separate the hose from the tap. Use this order:
- Disconnect the hose from the spigot and let the outdoor tap run for a short time.
- Catch some of the water in a clear glass or white bowl and look at it in daylight.
- Connect the hose again, run it for a short time, and catch water from the far end.
- Compare the two samples. If the tap alone is clear and the hose end is orange, the hose is the likely source.
If the color clears after you flush the hose for a few minutes, the rust was probably sitting inside it. Hose color that keeps coming back after a flush points to something upstream.
Check the Spigot and Connections
Look closely at the spigot where the hose attaches. Rust flakes can form on the threads, on the washer inside the connector, or on a backflow device near the faucet. A worn or cracked washer can also let water seep and leave rust stains on the siding or the ground below the spigot.
Wipe the spigot and the hose connector with a clean cloth. If the cloth picks up orange residue, the fitting is shedding rust. Replacing a worn washer or a corroded fitting is usually a simple repair, but if you are unsure about the valve itself, ask a licensed plumber to look at it.
If Indoor Water Is Clear but Outdoor Water Is Orange
When the kitchen tap runs clear and the outdoor tap runs orange even without the hose, the problem is likely in the outdoor line. Older homes in St. Louis may still have metal supply pipe or fittings that have rusted over time. A valve or a section of pipe between the main line and the outdoor spigot can also corrode and shed particles.
In this case, the color is coming from the pipe, not from the water supply in general. A plumber can check the line, and you can note in a simple log when the color appears, how long you ran the tap, and whether the color clears.
Testing Iron at Home or With a Lab
A visual test is a useful first step. Fill a clear glass, let it sit for a few minutes, and check whether the water turns cloudy or leaves a reddish film. A paper towel or white cloth can also show whether sediment is present. These checks help you decide what to examine next, but they do not measure how much iron or any other material is in the water.
For a true measurement, send a sample to a certified laboratory. Ask the lab to test for iron, and if you suspect other metals, ask about those as well. Collect the sample from the outdoor tap only if you want to test the outdoor line. Otherwise, test the indoor tap so your results reflect the water coming into the house.
What to Do Next
Once you know where the color is coming from, take these steps in order:
- Flush the hose and drain it fully after each use, then store it out of direct sun.
- Replace a cracked hose or a corroded hose end.
- Replace a worn washer or fitting at the spigot.
- If the outdoor line is the source, have a plumber inspect the pipe and valve.
- If the indoor water also runs orange, test the water supply and ask a qualified water treatment professional to review the results.
Orange water from an outdoor tap is usually a hardware problem with an easy fix. Working through the hose, the spigot, and the line in that order will usually show you where the rust is coming from.