Wentzville sits in St. Charles County, and the public water reports for the area describe a supply that is very hard, drawn from a mix of river water and groundwater. Radium rarely comes up in everyday conversation about water because it does not change the taste, smell, or color of a glass. It does appear in local water reports as its own line item, though, and if you live on a private well near Wentzville, that line is one you may need to test for yourself.
What radium is
Radium is a naturally occurring element found in some rock and soil. As groundwater moves through the ground, it can pick up small amounts of naturally occurring material along the way. Deep bedrock wells are the type of private well most often associated with naturally occurring radium in the area, so homeowners on those wells have the most reason to ask about it. A test tells you whether radium is present. It does not, by itself, tell you what the result means for your household, so pair the result with guidance from your county health department or a state-certified laboratory.
Reading the public report line
Public water reports list combined radium as a regulated item with its own result. Combined means the lab added the two radium measurements together and reported one total. That result describes the city system's water at the time of sampling. It does not describe your well, because your well draws from its own depth, its own casing, and its own part of the aquifer. A municipal result is useful background, but it cannot stand in for a sample from your own water source.
Private wells are not covered by the report
Public systems publish an annual consumer confidence report. Private wells are unregulated and sit outside that system, so no one is required to send you a radium result for your well. If you have never tested, you may have no record at all. That puts the testing job on you, and it is worth doing before you assume your water is fine.
How to test a Wentzville well for radium
- Choose a state-certified laboratory that offers radium analysis for drinking water. Ask whether they test for combined radium and whether they report both isotopes.
- Use the container, preservative, and fill instructions the lab provides. Do not rinse a bottle that has a preservative in it, and do not substitute a container from the kitchen.
- Decide what you want to learn. A sample taken before any treatment shows the raw water coming from the well. A sample taken after a treatment unit shows what reaches your faucets. Both answers are useful, but they answer different questions, so label the sample clearly.
- Let the water run until it has cleared the pipes you are sampling from, unless the lab instructs otherwise for your specific test.
- Ship or deliver the sample within the time the lab specifies, and keep the chain-of-custody form the lab gives you.
Reading the result
A lab report lists the result for each measurement, the reporting limit, and the date of collection. Check that the sample location, date, and whether the sample was raw or treated all match what you intended. If the report lists a value and a standard it is compared against, read the standard the lab cites rather than relying on memory or a neighbor's story. If anything on the report is unclear, call the lab and ask them to explain the line in plain terms.
If the result is high
Radium treatment is a different job from softening or iron removal. Wentzville private wells often carry high hardness and sometimes iron or sulfur, so a home may already have a softener or filter in place. Do not assume that equipment installed for hardness or iron will also handle radium. Get the full profile of your water first, then talk with the health department or a qualified water professional about what the results support. After any treatment is added, retest the output to confirm it is doing what you expected.
Keep your records
Save every lab report with its collection date, sample location, and whether the sample was raw or treated. Note the well depth, casing details, and any service records if you have them. Test again after work on the well, after a change in treatment equipment, or when you notice a shift in the water. A simple folder of reports gives you a clear picture over time, and it makes the next conversation with a professional much faster.