Wentzville sits in St. Charles County, where many homes draw water from a mix of river water and groundwater, and where some older or rural properties still rely on a private well. If your home is one of those, the water comes from a source that no utility monitors for you. That makes testing your responsibility, and radium is one substance worth understanding before you decide what to do next.
What radium is
Radium is a naturally occurring element found in some bedrock and in the groundwater that moves through it. It is not added by a plant, a neighbor, or a homeowner. Public water reports for the Wentzville area list a combined radium line, which is a total across more than one radium isotope. In this region, deep bedrock wells are the local water profile where naturally occurring radium is flagged as a concern, because the water has spent time in rock layers where the element forms.
Why a private well is different
A public water system reports its results on a regular schedule, which is why you can look up a combined radium line for the Wentzville supply. Private wells are unregulated, so no report arrives in your mailbox. The only reliable answer for your own well is a sample you collect and send to a laboratory.
Choosing a lab and collecting a sample
- Use a laboratory certified for drinking water testing in Missouri, and ask directly whether it runs radium analysis.
- Ask the lab for its bottles, collection instructions, and chain-of-custody form before you begin.
- Collect from a cold tap upstream of any softener, filter, or tank, so the result reflects the source water.
- Write down the date, the time, and whether the water had been running for a while before collection.
- Store the lab report with your well record so future results can be compared against it.
Reading the result
A radium result is reported with a unit and a detection limit. Read the detection limit first. A result listed as below that limit means the lab did not find the substance at its reporting level. Compare the result against the drinking water standard the lab names, and ask a qualified water professional or your county health office what the figure means for your household. Public water reports for Wentzville use the same kind of line, so the terms will look familiar once you know where to find them.
Treatment options, in general terms
If a test finds radium, the right response depends on the level, your water chemistry, and what else your well contains. Many homes in this area already use ion exchange softening because of hardness, but whether that process addresses radium is a question to settle with your installer or supplier and with a fresh test after the equipment is in place. Other homeowners look at systems designed specifically for radium. Do not assume a unit works just because it removes hardness or iron. Test the treated water after any system goes in, and keep those results with the rest of your records.
A simple testing plan
- Confirm your source. If you are on a Wentzville public system, start with the most recent water report instead of sampling.
- If you have a private well, use your well log to identify whether it is a shallow river-bottom well or a deep bedrock well.
- For a deep bedrock well, schedule a radium test together with hardness and a basic drinking water panel, so you make one trip to the lab.
- Read the report line by line, including the detection limits.
- If a result is high, get a second opinion on treatment before buying any equipment.
- Retest on a schedule you set with your lab or water professional, and again after any change to the well, pump, or plumbing.
Deep bedrock wells near Wentzville often carry very high hardness along with the radium concern, so testing for both at the same time is the efficient choice. A clear plan, a certified lab, and a written record will tell you more than guesswork about the water coming into your home.