A static water level is the depth at which water stands in a well when the pump is not running. Over time, a set of these readings shows how the water supply behaves around your property. Most homeowners cannot take this measurement safely on their own, but you can keep a record of readings a professional takes and learn what the numbers mean for your household.
What the Number Represents
Static level is measured from a fixed reference point, usually the top of the casing or a marked edge of the well cap. Drawdown is the drop in level while water is being pulled. Recovery is how quickly the level returns after pumping stops. These three readings are different, and mixing them up leads to confused records.
In Missouri, water levels can shift with seasons, dry spells, and heavy rain periods. A single reading tells you little. Several readings taken under similar conditions, written down over years, tell you much more.
Why Keep a Record
A written history gives you something to compare against when the well changes. If your water runs weaker in late summer, or the pump cycles more often than it used to, a record helps you ask whether the level has dropped or whether the problem sits elsewhere, such as in the pressure tank or a plumbing restriction.
A record also helps when you sell, refinance, or pass the property to someone else. New owners often want to know how the well has behaved, and written records are more reliable than memory.
Who Measures and How
Measuring static level usually means lowering a weighted line or an electric sounder down the well casing. This means opening a sealed well, which can expose the water to contamination and puts you near a pump and its wiring. For that reason, leave the measurement to a licensed water well driller or pump service provider, and ask them to record the date, the reference point, and whether the pump had been off before the reading.
What to Write Down
- The date and time of the reading.
- The reference point used, such as the top of the casing or a marked edge of the well cap.
- Whether the pump had been off, and for how long.
- Recent weather, such as a dry stretch or heavy rain in the prior days.
- Who took the reading and what tool they used.
- Household changes, such as a new irrigation line or an added bathroom.
Reading Your Notes Over Time
Keep these notes with your well completion record and your annual maintenance log. Compare readings taken in similar seasons, since a spring reading and a late summer reading are not directly comparable. A trend across several seasons is more useful than a single change.
- Note whether changes line up with dry periods or heavy rain.
- Note any new nearby wells or heavy pumping on neighboring land, if you know of it.
- Note any pump replacement or work on the drop pipe, since these can change the readings.
When to Call a Professional
If the pump runs dry, cycles rapidly, or flow drops suddenly, a water level check is only one of several steps. If you suspect the pump is running without water, turn off its power at the breaker and call a licensed water well contractor. Do not attempt repairs to the pump, wiring, or well casing yourself.
This guide is an independent reference for Missouri private-well owners. It does not replace a licensed driller, a pump service provider, or a state or local water agency. If you are unsure about a reading, ask a qualified professional to review it with you.