An abandoned well is a well that no longer supplies water to a home or farm. These are often left behind when a property changes hands, when a new well is drilled, or when a farm is divided. Many Missouri properties have one or more older openings in the ground that the current owners never knew about. Finding them is mostly a records and yard task, and it matters because an open well can be a direct path from the surface down to groundwater.
Why an Old Well Matters
An unused well with a damaged, unsealed, or missing cap can let surface water, soil, debris, and small animals reach the water below. Even if the old well looks dry, it may sit in the same aquifer your current well uses. For that reason, an old opening is not just a yard feature to ignore. This guide explains how to look for one and what to record. It does not cover how to plug or repair a well, which is work for a qualified professional.
Start With the Paperwork
Records are often the fastest way to learn whether an older well exists on your lot. Gather what you already have:
- Closing documents and any seller disclosure, which sometimes mention wells, cisterns, or septic tanks.
- The completion record for your current well, which may note earlier drilling on the same parcel.
- Survey or plat maps showing outbuildings, easements, and former house sites.
- Records from your county recorder or assessor, and any state water well records kept for Missouri properties.
Write down every mention of a well, even if the record is vague. A line such as old well near the barn is enough to start a search.
Walk the Property Carefully
Old wells tend to be near places people once lived or worked. Check former house sites, barns, livestock areas, stock tanks, windmill foundations, and old fence corners. Look for these signs:
- A concrete ring, slab, or square block at or just above ground level.
- A short pipe stub, rusted cap, or wooden cover board.
- A small sinking spot in the lawn or field that holds water after rain.
- A pump house foundation with no pump or pipe connected.
- Old pipe running out of the ground with no visible use.
Safety comes first. Do not step on, pry at, or remove a cover, and do not drop anything into an opening. Keep children and pets away from the area. If you find an opening, mark it with a flag or stake, keep the marker visible, and avoid mowing or parking directly over it.
Consider the Surroundings
When you map an old well, note what is nearby. Record its distance from your current well, any septic components, fuel storage, animal lots, and areas where fertilizer or pesticide is used. Also note whether the spot collects runoff from roofs, driveways, or fields. This map is a homeowner record, not a diagnosis, but it gives any future professional a clear starting point.
Do Not Use an Old Well as a Sample Source
Water standing in an abandoned well is not a valid sample of your home's supply. It does not reflect the conditions your household water comes from, and collecting from it can expose you to unknown materials. If you want to know about the water you use, test your current well through the normal sampling steps described elsewhere in this desk's guides.
Next Steps
- Write down every location, description, and record you found.
- Photograph each site from a fixed point, and sketch a simple map showing distances to your current well and nearby features.
- Ask a qualified professional to evaluate any opening you cannot identify before you attempt any work near it.
- Keep this record with your well maintenance logbook so the information stays with the property for future owners.