If your Wentzville home draws water from a private well, no utility is testing it for you. Public water reports for the area describe the municipal supply, but a private well falls outside that oversight, so the testing schedule is up to you. This guide lays out a practical routine you can follow each year, plus the moments when you should test sooner.
Start with a baseline panel
Before you set any schedule, run a full baseline panel through a certified laboratory. Ask for bacteria, nitrate, and a general chemistry panel that covers hardness, iron, manganese, sulfate, and pH. If your well sits in river-bottom ground near Wentzville, ask the lab to include a sulfide or sulfur-odor note in your order. If your well is drilled deep into bedrock, ask specifically about radium. Keep the lab report with your well records so you have a reference point for every later test.
The yearly core tests
Most private well owners in the Wentzville area can build a stable routine around a short list of tests that they repeat every year:
- Coliform bacteria. This test shows whether bacteria are present in the sample. It is the most common yearly check because conditions around a well can change with rain, flooding, and nearby land use.
- Nitrate. Nitrate can move into groundwater from fertilizer, animal waste, and septic systems. A yearly check helps you spot a trend before it becomes a surprise.
- Basic chemistry. Hardness, iron, manganese, sulfate, and pH tell you how the water is likely to affect fixtures, laundry, and any treatment equipment you already own.
Collect each sample the same way every year, using the same tap, the same container from the lab, and the same flushing routine. Consistent sampling is what makes a yearly comparison meaningful.
Tests to run every few years
Some tests do not need to be repeated every year unless your situation changes. These are worth scheduling every few years, or whenever you suspect a problem:
- Radium. Naturally occurring radium is associated with some deep bedrock wells in the region. Because it changes slowly, a repeat every few years is usually enough for a stable source.
- Full metals panel. A broader scan for metals can help if the water color or taste shifts, or if you add a new pump, pipe, or fitting.
- Volatile organic compounds. If the well is near a fuel tank, a farm operation, or a commercial site, ask a lab whether this panel makes sense for your property.
Test sooner after changes
Some events call for a test outside your normal calendar. Plan a sample soon after any of the following:
- Flooding, heavy rain runoff, or standing water near the wellhead
- Repairs to the pump, pressure tank, wiring, or well casing
- Septic tank pumping, field repairs, or a new drain field nearby
- Construction or excavation within sight of the well
- A change in taste, odor, color, or clarity that you can see or smell
- Installing or changing a softener, iron filter, or UV unit
- A new neighbor's well problem or a local advisory that applies to your area
After a repair or disinfection, wait until the system has run and been flushed as your installer or lab instructions describe before you collect a sample. A test taken too early may show conditions that will clear up on their own, which can make the result harder to read.
Keep a simple log
A yearly schedule works best when you can compare results over time. Keep a single page or spreadsheet with these details for each sample:
- The date the sample was collected and the date it was received by the lab
- The lab name and the tests requested
- The results for each parameter, with the reporting limits printed on the report
- Any treatment equipment running at the time of sampling
- Any events from the list above that happened since the last test
Store the original lab reports with the log. When you bring a new report to a contractor, a lab, or your own review, a clean history makes the conversation much faster.
A simple routine to follow
For most Wentzville homes on a private well, a workable plan is to run the core yearly tests, repeat the broader panels every few years, and add a sample whenever the house, the property, or the water changes. Set a reminder for the same month each year so the results stay comparable. The goal is not to chase every possible contaminant but to know your own well well enough to notice when something has shifted.