If you own a home in Wentzville and draw water from a private well, the paperwork from when the well was dug may be the most useful thing you have before you order a single test. A well driller's report, sometimes called a well log, records what the crew found underground, how deep the well goes, what layers of soil and rock they passed through, and where the water entered the hole. That information helps you decide which tests make sense for your property.
Why the Well Log Matters Before You Test
Private wells in and around Wentzville generally fall into two groups. Shallow wells in river-bottom ground often draw from alluvial sediment, where iron, manganese, hardness, and sulfur odors are common concerns, and where nearby farm fields or septic systems can raise questions about bacteria and nitrate. Deeper wells drawn from bedrock often carry very high hardness and can contain naturally occurring radium. A log can show which pattern is more likely for your well, so you are not guessing from taste or color alone.
Where to Find the Report
- Check your closing packet from the home purchase, since copies are sometimes kept with mortgage or title records.
- Ask the previous owner whether they kept documents in a binder, a drawer, or a utility room.
- Contact the state or county office that handles well permits and ask whether a construction record exists for your address.
- Look for a well tag or permit number on the pressure tank, the wellhead, or the control box, then search for that number with the office that issued it.
What to Read on the Log
- Total depth and casing length. If the casing is short relative to the ground around it, surface water has a more direct path into the well, and that makes a bacteria and nitrate test more worthwhile.
- Water-bearing zones. Notes about where water entered the hole can help you connect your water's taste, color, or odor to a likely source.
- Rock and soil type. Sand, gravel, or river-deposited layers point toward alluvial water. Dense limestone or dolomite layers point toward bedrock.
- Static water level and yield. These describe the water column and how much the well produced when it was drilled, which gives you a reference point for pressure readings you log later.
- Grout and seal details. Missing or unclear sealing is a reason to inspect the wellhead before you collect a sample.
Turn the Log Into a Testing Plan
Once you know the likely source, you can choose what to test. A general bacteria test is a reasonable starting point for any private well. A homeowner with a river-bottom well may also want iron, manganese, nitrate, and sulfide results. A bedrock well owner should ask a lab about hardness and radium, since those results bear directly on whether a softener or a filter is worth considering. Ask the lab to explain each result in plain terms, and keep copies with your well log.
When the Log Is Missing
Some homes have no paperwork at all. In that case, record the well's location on your property, look for a cap and vent on the wellhead, and check that both are intact and screened. Then ask a certified lab which testing panel fits the area. Write down what you find, including the date and any odors or color changes you notice, because a driller or lab can use those notes later.
Public water reports cover Wentzville's municipal supply, but they do not describe a private well at all. Private wells are not regulated the way public systems are, so the responsibility for testing sits with the homeowner. Start with the log, then build your plan from what it tells you, and retest on a schedule you can keep.