Many homes in and around Wentzville rely on private wells, and not all of them are drilled the same way. A shallow well that draws from river-bottom ground sits closer to the surface, which means it can pick up whatever moves through the soil above it. Nitrate is one of those substances. It is a dissolved form of nitrogen that can travel with water from fertilized fields, lawns, and septic systems. You cannot see, smell, or taste it, so a lab test is the only reliable way to know what your well carries.
Start by Knowing Your Well Type
Before you order any test, confirm what kind of well you have. Your well log from the original drilling, the county records on file, or the installer's paperwork from when the well was finished should list the depth and the geologic formation. Two common types show up in the Wentzville area:
- River-bottom alluvial wells are shallower and sit in sand, gravel, and silt near the river. They are more exposed to surface activity, so they are the wells most often tested for nitrate and bacteria.
- Deep bedrock wells are drilled much farther down. They are usually less exposed to surface runoff, but they often carry very high hardness and can contain naturally occurring radium, so they need a different test panel.
If you are unsure which type you have, ask the lab which panel fits your situation. Labs get this question often, and many will help you pick the right package.
What to Ask the Lab to Test
Nitrate is usually part of a basic private well panel, but do not assume it is included. Confirm the list before you pay for the kit. A typical shallow well check for this subject often includes:
- Nitrate and nitrite, reported together or separately as the lab lists them.
- Total coliform and E. coli, which show whether bacteria are present in the sample.
- Hardness, iron, manganese, and pH, so you can plan the rest of your treatment setup.
- Any sulfur or odor-related tests, if the water smells like rotten eggs.
Ask the lab how long results take and whether they will email a copy of the report to you directly. Keep the full report, not just a summary line.
Collect the Sample Correctly
A sample taken the wrong way can give a result that does not match what is in your well. Follow the lab instructions exactly, and use the bottle they supply. Common steps include:
- Wash your hands and remove any faucet aerator or screen from the tap you will sample.
- Run the cold tap for a few minutes so the water coming out is from the well and not the pipe.
- Fill the bottle to the line the lab marks, without rinsing it out first, unless the instructions say otherwise.
- Cap the bottle, label it, and keep it cool until it reaches the lab.
Do not sample from an outdoor spigot, a filter, or a softener bypass line unless the lab tells you to. Those spots can add or change what the test measures.
Reading the Result
Every lab report lists its reporting limit and the standard it compares your result against. Read those two lines first. A result that is below the reporting limit means the substance was not detected at that level. A result above a standard means you should act, not wait. If a number seems unclear, ask the lab to explain it in plain terms. They can usually tell you what the report means for your household, and they should be able to point you to the right next step.
What a High Nitrate Result Means for Next Steps
A high nitrate result is a reason to take action, not a reason to panic. Consider these steps:
- Retest the same well to confirm the first sample was not an error.
- Check the location of your septic tank, drain field, and any fertilizer storage relative to the well.
- Ask a qualified water treatment professional about options that are designed to reduce nitrate. A standard water softener is built for hardness, not nitrate, so it will not solve this problem on its own.
- Ask the local health office for guidance if the result affects drinking water for infants or anyone pregnant in your household, and follow their advice.
Keep in mind that treatment choices depend on the full set of results, not one test alone. Hardness, iron, and bacteria results may point to a different order of treatment, so review the whole report before you buy equipment.
Keep Your Records
Save every well report in one folder, with the date you sampled and the lab name on each page. Note any changes around the property, such as a new septic pump-out, a fertilizer application, or a repair to the well cap. When you retest in future years, you will be able to compare results side by side and spot trends early.
A shallow well near Wentzville is worth testing on a regular schedule, even when the water looks clear and tastes fine. Testing first, then planning treatment, is the most practical way to decide what your home needs.