If you live in Lake St. Louis and fill a watering can, rinse a car, or run a garden hose on a summer evening, you may have wondered whether that water matches what comes out of your kitchen tap. In many homes it does not. Whether an outdoor spigot carries softened water depends on where the plumbing branches off, and that answer decides what your lawn, garden, and vehicles are getting.
Find out where your outdoor spigot connects
Start where the main water line enters the house, usually a basement, utility room, or garage. Look for the softener, its bypass valve, and the pipes leaving the tank. Then follow the cold line that runs to the outside faucet. Some outdoor spigots are tied in ahead of the softener, so they carry untreated water. Others are run after the softener, so the water is treated.
If the route is hard to follow, try a rough check. Run the outdoor spigot, then run a kitchen cold tap for the same length of time. Rinse your hand under each and compare. Softened water often feels slick or squeaky, while untreated water usually feels more like the supply you would expect from the street. This is only a clue, not a test, so confirm with a proper check if the answer matters for your use.
Why it matters for plants and yards
Public water reports describe Lake St. Louis tap water as very hard, so mineral spots and buildup show up quickly on leaves, pots, and drip emitters. Many homeowners prefer untreated water for container plants and seedlings for that reason. Softened water is different because the softening process adds sodium. Some gardeners worry about repeated watering with softened water affecting soil and certain plants over the long run, so watch how your beds and lawn look across several seasons rather than relying on one observation.
Cars, washing, and pets
Hard water leaves spots when it dries on car paint and glass. Softened water rinses more easily and tends to leave fewer spots, which is why some people wash vehicles with it. Pet owners who fill outdoor bowls or wash animals in the yard should also think about which spigot they use. If an animal drinks from an outdoor bowl, consider which water it is getting and ask your veterinarian if you have questions about it.
Label each spigot
- Mark each outdoor faucet as untreated or softened with a tag or marker.
- Note the labels in your home records next to your water report.
- Tell everyone who waters, washes, or fills containers at the house.
Hoses, backflow, and winter
Hose connections are a common source of trouble. Use a backflow prevention device on hose connections when the product instructions or local plumbing rules call for it, especially where a hose could draw from a fertilizer or chemical mix. Before freezing weather, shut off and drain outdoor lines and disconnect hoses so the faucet can empty. Freeze damage can crack fittings whether the water is softened or not.
When to test before you decide
If you plan to fill a pool, irrigate edible crops, or provide drinking water for animals from an outdoor spigot, test that water before relying on it. A test can show hardness, iron, and other items that matter for your use. Use a certified laboratory or a water testing service that can run the panel you need, and bring your water report along with a note of which spigot you tested.
Next steps
- Trace the outdoor line back to the house.
- Label each spigot as untreated or softened.
- Choose each spigot based on the job, whether plants, vehicles, pets, or a pool.
- Test before relying on the water for anything sensitive.