Most homes in St. Charles drink city water, which is treated and reported under public rules. Some homes in and around St. Charles, though, rely on private wells that draw from the Missouri River alluvial aquifer. Those wells can carry naturally occurring radium and uranium, and the concern can be greater near the documented Weldon Spring legacy site. If you have a private well in the area, these two elements belong on your testing list even when the water looks, smells, and tastes normal.
Radium and uranium are naturally occurring elements found in rock and soil. Neither one has a color, odor, or taste that a homeowner can detect, so a clear glass of water tells you nothing about them.
Who Should Test
- Anyone on a private well in St. Charles or St. Charles County who has never had radium or uranium tested
- Buyers of a home with a well who have no recent lab report on file
- Households near the Weldon Spring area that want more information than a general well screen provides
- Owners whose well has been affected by river flooding, since floods can change well conditions and water chemistry
What a Standard Home Kit Will Not Show
Common home test strips and drop kits usually cover hardness, iron, pH, and sometimes nitrate or bacteria. Most do not screen for radium or uranium. Read the label before you assume a kit covered them. A certified lab test is the dependable way to get a measured answer for these elements.
How to Collect a Sample
- Contact a certified drinking water laboratory and ask whether it runs radium and uranium on private well samples.
- Request the sample container from the lab and follow its instructions exactly, since preservatives and fill lines matter.
- Collect from a cold tap closest to the wellhead, before any treatment equipment, and run the tap as the lab directs.
- Keep the sample cool, label it with the date and time, and deliver it within the window the lab sets.
- Note on the submission form whether the well was recently flooded, serviced, or changed in any way.
Reading the Results
A lab report lists each element with a measured value and the drinking water standard it is compared against. Check the units, the detection limit, and whether the result is marked not detected. A not detected result means the lab did not find the element at its test level, which is different from proof that none is present. Ask the lab to explain any wording you do not understand.
Treatment Is a Separate Decision
A high result does not mean a single filter will fix the water. Radium and uranium removal usually depends on equipment matched to the specific element and the rest of the water chemistry. Take the lab report to a qualified water professional before buying anything, and ask that person to explain the treatment options, the maintenance schedule, and how the system will be checked after installation.
Keep every report with your well records, and retest on a schedule set with the lab or your local health guidance. After any treatment change, retest the water at the tap you drink from, because that is the result that matters for your household.