Selling a home in Lake St. Louis often brings up water questions that did not come up during the purchase. A buyer may ask whether the house is on city water or a private well, what the softener does, and whether the water has been tested. Having answers and records ready keeps that conversation simple. This guide covers what to gather before you list, what a test can and cannot tell you, and how to keep the process practical.
Start with the water source
Lake St. Louis homes draw water from the municipal system or from private wells, and the difference affects your paperwork. Confirm which one serves your home by checking utility bills, property records, and any plumbing drawings from past work. If the home has a well, note its depth, the year it was drilled if you know it, the condition of the cap and vent, and where the pressure tank sits. Buyers and their inspectors will ask these questions, and clear answers save time.
Collect the records you already have
- Recent water bills or the most recent utility water quality report for municipal service
- Any past well test results, including bacteria, nitrate, iron, manganese, and hydrogen sulfide checks
- Softener model, installation date, service visits, and any media or resin replacement notes
- Permits or receipts for plumbing changes, including bypass valves and drain connections
- Maintenance notes for the pressure tank, filters, and any other treatment equipment
Decide what to test and why
A test shows what is in the water on the day it was collected. It does not predict future results. For municipal water, the utility report describes conditions across the system and lists items such as hardness, high pH, disinfection byproducts like TTHMs and HAA5, and chlorine disinfection. Those lines give a buyer useful context, but they describe the public supply, not the fixtures in your specific house.
For a private well, a recent test is more useful than an old one. Common concerns in the area include iron and manganese staining in river-bottom wells, rotten-egg hydrogen sulfide odor from deeper bedrock wells, nitrates from agricultural runoff and septic systems, coliform and E. coli bacteria, and naturally occurring radium in deep eastern Missouri bedrock aquifers. The former Weldon Spring cleanup site sits in the service area, which is one reason many well owners include radium in their test plan, even though current municipal radium readings are within limits.
Run the test in an orderly way
- Choose a lab or kit that lists the exact parameters you need, not a general package you have not read.
- Collect samples at the tap and in the manner the lab specifies, and follow its bottle and cooling instructions.
- Write down the date, the time, and whether the softener was in the middle of a regeneration cycle.
- Keep the full lab report, not only a summary page, so a buyer can read the methods and detection limits.
Explain the softener in plain terms
Buyers often want to know what the softener does and whether it is working. Describe it simply: it reduces hardness in the water, it uses salt in a brine tank, and it regenerates on a schedule or based on use. Show the current settings, the salt level, and the date of the last service. Do not claim results beyond what the equipment and records show. If the unit is leased rather than owned, say so and gather the lease documents with the rest of the packet.
Share what you know
If a result needs follow-up, share the full report with the buyer and explain what you plan to do about it. A plain summary with the lab sheet attached is usually easier to handle than a verbal description. Questions outside your records, such as the local supply or the condition of the well casing, are best sent to the buyer's inspector, the utility, or a qualified water professional.
Keep the packet simple
Put everything into one folder, paper or digital, with a short index at the front. List each record, its date, and where it came from. Update the packet if you service the softener or retest the well before the listing closes. A tidy packet shows the home's water history clearly and gives you straightforward answers when questions come up during showings and inspections.