If your home in Lake St. Louis runs on a private well, radium is one of the water tests worth asking about. Radium is a naturally occurring radioactive element. It can be present in deep groundwater, including water from the bedrock aquifers of eastern Missouri, and you cannot detect it by taste, smell, or color. The only way to know what is in your well is to test it.
Why the Lake St. Louis area is worth a closer look
Lake St. Louis sits in St. Charles County, and the surrounding area draws water from a mix of river sources and groundwater. The former Weldon Spring cleanup site is inside the service area, which is one practical reason many homeowners ask about radioactive contaminants. Current municipal readings for radium fall within limits, so city water is not the main concern here. The question matters most for homes that pull their own water from the ground.
Who should consider testing
- Homes on private wells, especially those drilled into deeper bedrock
- Homes whose wells have never been tested for radiological parameters
- Buyers of a home with an existing well and no recent water report
- Owners who have had well or pump work that may have changed the water source
What to do before you collect a sample
- Call a certified drinking water laboratory and ask whether it tests for radium, along with the sample container and volume it requires.
- Ask how the sample should be preserved and how quickly it must reach the lab.
- Write down the well's depth and construction date if you know them, since the lab or your testing guidance may ask.
- Follow the lab's flushing instructions so the sample reflects water from the well rather than standing water in the pipes.
Reading the results
A lab report lists radium as a measured value with units and a reporting limit. Compare that result to the drinking water standard your state uses, and file the report with your home records. A result near or above the standard is a reason to talk with a qualified water professional about treatment options. A result below the standard gives you a useful baseline for future checks.
What treatment does and does not cover
Radium is handled by specific treatment methods, and a softener built for hardness minerals is not automatically a radium solution. Confirm with a qualified professional which approach matches your lab result before you buy any equipment. Do not assume that a general filter or softener addresses radium just because it addresses other concerns.
If you are on city water
If your Lake St. Louis home is connected to the municipal system, the utility's annual water quality report is the right place to check current radium results. Those readings are a better guide to your tap than a general assumption, and they tell you what the system is measuring at the source.
Keep your records
Store each test report with its date and sample location. A single test is a starting point, not a permanent answer. Retesting on a schedule you set with your lab or local health guidance gives you a record you can compare over the years, and it shows you when something has changed.