If you run a tap in St. Charles and find sand, grit, or fine specks in the water, the first job is not to buy a filter. It is to figure out where the material is coming from. Sand in a home water supply usually points to one of a few causes, and each one leads to a different next step.
Start With the Pattern
Before you touch anything, watch how the grit shows up. Written notes are more useful later than memory, so jot down what you see.
- Does it appear at every tap, or only at one faucet?
- Does it show up after the well pump runs, such as after a long shower or a load of laundry?
- Is it in the cold line, the hot line, or both?
- Did it start after a storm, a power outage, or a well service visit?
Grit that appears at only one fixture often sits in the faucet or its aerator. Grit that shows up across the house after pumping points to the well, the pressure tank, or the plumbing between them.
Check the Fixture Before the Well
Unscrew the aerator at the tip of the faucet and look at the small screen inside. Rinse it under running water and check for gritty debris caught in the mesh. If the screen is clean and grit still shows up, run the tap for a few minutes and check again over several days.
Look at the Well and Pump Behavior
Many private wells in and around St. Charles draw from the Missouri River alluvial aquifer. Sand or fine silt can move into a well when the pump draws hard, when the screen or gravel pack around the intake has worn, or when repairs leave material behind. Sediment that stirs up as the pump starts is a common pattern worth noting.
Write down whether you see any of these signs:
- A burst of grit right after the pump kicks on
- Sediment that gets worse during heavy use or after heavy rain
- Cloudiness that clears after running the water for a few minutes
- Changes after a pump replacement, a well repair, or a noticeable drop in water level
Collect a Simple Sample
Fill a clean clear glass or jar from a cold tap, set it on a counter, and leave it undisturbed for a while. Look at the bottom. Settled grains that look like sand or silt suggest particles in the water. A film, slime, or color change points to a different cause and deserves a lab test.
What a Lab Can Tell You
A simple look cannot tell you what the grit is made of. If the material looks like sand, you mainly want to know whether it is coming in from the well. If you also see color, staining, or an odor, ask the lab for tests that cover those specifically. Get the sampling instructions in writing and follow them exactly, because a mishandled sample can give a misleading result.
Next Steps by Cause
- Clogged aerator: clean it, rinse it, and recheck over the following days.
- Grit only after pumping: have a licensed well contractor inspect the pump, the intake, and the condition of the casing or screen.
- Grit after a power loss or storm: check the pressure tank, the pump controls, and whether the well may have been disturbed.
- Sand throughout the house: consider a sediment filter sized for your flow, and read its rating carefully, since a rating describes what the filter is designed to capture and does not promise results in your home.
Do Not Skip the Source
A filter on the house line can keep sand away from fixtures, but it does not fix a worn well or a pump that is pulling material from the aquifer. Cleaning the aerator and correcting the source keeps the system working and reduces wear on appliances downstream. If the grit keeps returning after those steps, the well itself is the next place to look.