When a Missouri well runs low, the first sign is often a shower that slows to a trickle after a long wash load. A yield check is a simple way to learn how quickly your well refills, which helps you decide when to run heavy water use and when to wait. It is a homeowner observation, not a formal pump test, and it does not replace an evaluation by a qualified well professional if you suspect a serious problem.
What a yield check can and cannot tell you
A yield check measures how fast water returns to your pressure tank and plumbing after a planned draw. It gives you a rough sense of recovery over time. It does not measure the aquifer, confirm well depth, or tell you whether your water is safe to drink. Treat each result as one data point in a log you keep over months and seasons.
Gather your tools before you start
- A container with a clearly marked volume, such as a bucket you have marked yourself from a measuring jug
- A notebook or phone note to record the date, time, and recent weather
- A watch or clock with a second hand
- A basic idea of where your pressure tank and pressure switch are, so you know whether the pump is running
Steps for a simple refill timing check
- Avoid running water in the house for several hours, so the tank is full and the pump is off.
- Choose an indoor faucet that draws straight from the pressure system, not an outdoor spigot or an irrigation zone.
- Open the faucet fully and note the exact time.
- Fill your marked container from that faucet, stop when it reaches the mark, and note the elapsed time.
- Repeat the fill at least two more times, using the same faucet and the same container each time.
- Write down your average time, the date, and anything unusual, such as a load of laundry running during the test.
Reading your results
Look at the trend, not a single reading. If fills take about the same time each season, your well is likely stable at that draw rate. If fill times grow longer over several weeks, or drop off after heavy use, record that pattern in your log. Dry weather, a heavy lawn irrigation schedule, or several fixtures running at once can all change the numbers, so note those factors alongside each result.
Pump noise that runs longer than usual, frequent short cycling, and sputtering at the faucet can also point to a pressure or pump issue. Those signs deserve a separate look and should not be dismissed because the fill times seem fine.
When to stop and call for help
Stop running water heavily and contact a licensed well contractor if you notice a sudden drop in flow, air at the taps that does not clear after a few minutes, cloudy or muddy water, or a pump that runs without stopping. Your well completion record, if you have one, can help a service provider find the original depth and pump details, which speeds up any diagnosis.
Keep the log with your well records
Store the yield log with your maintenance records and your completion record. Over a year or two, the log becomes useful for spotting slow changes that are easy to miss day to day, especially during dry spells across Missouri. A written history also helps any future service visit, because the technician can see what you observed and when.