If your St. Peters home runs on a private well, the bacteria and hardness results you already have may not tell the whole story. Radium and uranium are naturally occurring elements that can move into groundwater from the rock and soil around deeper aquifers. Neither one is visible, and neither has a taste or smell you can rely on, so a lab report is the only dependable way to learn what your well carries. This guide explains what to ask for, how to collect the sample, and how to read the results without jumping to conclusions.
Why these elements show up in some wells
Radium and uranium form in certain rock layers. As water moves through those layers over long periods, it can dissolve small amounts of them. Deeper aquifers in parts of the region can carry these elements, which is why the local conversation about private wells includes them alongside bacteria. Shallow wells and septic-dense areas raise a different concern, so a well near your home may need more than one kind of test.
The area near the former Weldon Spring chemical and ordnance site deserves particular attention. Uranium has been documented in alluvial groundwater there. Alluvial groundwater sits in the sand and gravel deposits along streams and rivers, so a well drawing from those layers can behave differently than one drawing from bedrock. If your property is in or near that area, ask your lab and your local health office what has been reported nearby before you assume your water is typical.
What to ask the lab to test
A standard bacteria test does not measure radium or uranium. Request a radionuclide panel that lists both elements by name, and confirm the report gives a separate result for each one. Many routine panels leave them out, so check the list before you pay for the sample. If you already have a well report, look for these two items. If they are missing, a new sample is the simplest fix.
How to collect the sample
- Use the container the lab provides, and follow its fill instructions exactly.
- Draw from a cold tap connected directly to the well, before any filter, softener, or other treatment.
- Let the water run for the time the lab specifies, then fill the container without touching the inside of the lid.
- Label the bottle with the date, your address, and the tap you used.
- Deliver or ship the sample so it reaches the lab within its holding window.
A softener is designed for hardness, so do not assume it addresses other elements. Test the water as it comes from the well, not after any equipment has touched it.
Reading the results
A lab report lists each element with a measured value and a reference level, which may come from the lab or from public health guidance. Read the units and the reporting limit carefully. A result listed as below the reporting limit means the lab did not detect the element at its level of sensitivity. It does not always mean the element is absent from your water. Compare your result to the reference printed on the report, and keep the full report with your home papers.
When to retest
Consider a repeat test if the first result sits close to the reference, if your well is near the area described above, or if the water has changed in clarity or flow. Retesting on the schedule your lab or local health office recommends gives you a clearer picture over time than one sample taken on a single day.
Treatment decisions come after testing
Do not install equipment until you know what the test shows. Treatment for radium or uranium is a different job from softening, and the right approach depends on the element, the result, and how the water is used in the home. Until you have results, follow any interim guidance your local health office gives for drinking and cooking water. Bring the report to a qualified water professional, and ask what the proposed system removes and how its performance will be verified after installation.
Keep a written record of every test, including the date, the lab, the elements measured, and the result. That file will help you compare future samples and will make any conversation about your well much easier.