If you live in or around Wentzville and get your water from a private well, the first question is not which test to order. It is which aquifer your well draws from, because that decides which contaminants are worth looking for. Two broad patterns show up near Wentzville: river-bottom alluvial wells and deep bedrock wells. A test panel that makes sense for one can miss the main concern for the other.
Find out which type of well you have
Start with your well driller report or the paperwork from when the well was drilled. Note the depth, the casing details, and any geologic log. If you cannot find those papers, ask the previous owner, or ask the person who services your pump. Do not guess from the look of the house or from a neighbor's well, since two wells a short distance apart can draw from different formations.
Alluvial wells sit in river-deposited sand, gravel, and silt close to the water. Deep bedrock wells reach down into rock formations, and they often have longer contact with minerals in that rock.
What a river-bottom alluvial well tends to need
Alluvial wells around Wentzville are often associated with high iron, manganese, and hardness, along with a rotten-egg sulfur smell in some cases. Because shallow groundwater is closer to the surface, they also carry a higher chance of bacterial contamination and nitrate from farm runoff and septic systems. A reasonable panel usually includes:
- Total coliform and E. coli bacteria, since shallow groundwater can pick up microbes from nearby septic systems and surface influence.
- Nitrate, since fertilizer on farm fields and septic effluent are common sources in river-bottom land.
- Iron and manganese, which show up as staining and metallic taste and are often the reason a homeowner installs a filter.
- Hardness, which affects soap use, scale buildup, and how a water softener should be sized.
- A sulfur smell check, since the odor can come from the water itself or from bacteria growing in the well or pressure tank.
What a deep bedrock well tends to need
Deep bedrock wells in the Wentzville area often carry very high hardness. They can also contain naturally occurring radium, which is an element that some rock formations release into groundwater. The public water reports for Wentzville describe the city system, including a combined radium result, but those reports do not describe your private well. Private wells are unregulated and have no consumer confidence report, so if your well is deep in bedrock, you need to request radium testing yourself.
Hardness testing with strips can give a rough idea, but a lab report is what you need for treatment decisions and for any record you keep.
Build the right request for the lab
- Choose a lab that accepts private well samples and can state its methods in writing.
- Tell the lab your aquifer type and ask for the parameters that match it.
- For a deep bedrock well, name radium on the request so it is not left off the panel.
- Ask about holding times, container requirements, and shipping day before you collect the sample.
- Keep the chain-of-custody form with the sample and note the date and time of collection.
Read the results against your setup
A high hardness result points to scale and softener needs. Iron and manganese results guide the type of filter you consider. A positive bacteria result is a reason to act now, not a reason to wait, so follow the lab's guidance, address the likely source, and retest after the fix. Radium results from a deep well often lead to a different treatment choice than iron filtration does, so do not assume one filter handles every problem.
Keep every report in one folder. Over time, the set of results will show you whether a change in your well or your home is real or just a single unusual sample.
When to retest
Retest after you change the well, add or service a treatment system, or notice a change in taste, color, or smell. Do not wait for a problem before testing on a schedule. Rotate your panels from year to year so that alluvial concerns like bacteria and nitrate and bedrock concerns like hardness and radium each get checked on a regular basis.