A well completion record is the paper trail for how your private well was built. Drillers often call it a well log or well report. It describes where the hole was dug, how deep it reached, what the casing is made of, how the space around the casing was sealed, what soil and rock layers the driller passed through, and where the pump was set. When you own a home with a private well in Missouri, that record is one of the most useful documents you can keep, because many later questions, from pump trouble to a cap repair, are easier to answer when you know how the well was originally finished.

Where to look first

Start with what came with the house. Closing packets, inspection files, and seller disclosures sometimes include a copy of the well report. If you bought the home recently, ask your agent or the seller in writing whether a completion record exists. Next, check the home's filing box, the drawer where past warranties and manuals ended up, and any folder marked with a drilling company name.

If those come up empty, the county recorder or county clerk's office may hold documents tied to the property. Missouri also keeps water well records at the state level, and many of those records can be searched online by location or owner name. Searches work best when you have the property address, the legal description from the deed, and the name of the previous owner. Older wells drilled before record keeping was common may have no file at all, and that absence tells you nothing about the water quality itself.

What a completion record usually shows

  • The well's location on the property, and sometimes a sketch showing its distance from buildings, septic components, and property lines.
  • The drilling date and the name of the contractor who finished the well, which helps you know who to contact about past work.
  • The total depth drilled and the depth of the casing, which describe how far the well reaches and how far the lining extends.
  • The casing material and any finishing details at the top, such as a sanitary seal, a cap design, or a pitless connection.
  • The grout or seal material placed around the outside of the casing, which helps keep surface water from traveling down the outside of the pipe.
  • A driller's log of the layers encountered, such as soil, clay, sand, shale, limestone, or other bedrock.
  • Notes on the water level when the well was first measured and the yield reported at completion, which describe how the well performed when it was new.
  • The pump setting, pump type, and sometimes the pressure tank details.

How to use it on the property

Once you have the record, compare it with the well as it sits today. Walk the wellhead area and check whether the cap, vent, and casing top match the description. A record that describes a sanitary seal should match a sealed top, and a note about a pitless connection should line up with what you can see. Mismatches are not automatically a problem, since repairs and replacements happen over decades, but they suggest that someone may have changed the setup over time and that the file may be incomplete.

Keep a copy of the record with your other home papers. Note where the file lives in your maintenance logbook, along with the pump service date and the last time a professional looked at the wellhead. When someone later asks where the well is, what it is made of, or where the pump sits, the answer will be on paper rather than in memory.

What the record does not tell you

A completion record describes how the well was built. It does not describe the water. A clean record does not mean the water is safe to drink, and an old or incomplete one does not mean the water is unsafe. Water quality needs its own testing, using proper sample containers and a lab the homeowner selects, and the results should be read alongside the construction details. Bedrock matters too. Parts of Missouri sit over limestone and dolomite where cracks and openings can move water quickly, so the rock layers listed in a log help explain why a well may respond differently after heavy rain or during a dry season.

If you cannot find a record

  1. Look carefully at the wellhead and note what is visible, including the casing material, the cap, and any vent.
  2. Ask longtime neighbors on the same road who may have had their wells drilled by the same crew.
  3. Have a licensed well contractor inspect the wellhead, tell you what they can see, and document it in writing for your files.
  4. Start a fresh record in your own logbook with the date, the visible details, and any photos you take.