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Low-Yield Wells: When the Problem Is the Well

Some wells simply do not deliver much water per minute. That is not a fault to be repaired, and treating it as one wastes money.

The short of it

A well that recovers slowly produces symptoms that look exactly like a failing pump: pressure dropping away under sustained use and returning after a rest. Telling a yield problem from an equipment problem is a matter of how the system behaves over time.

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Yield against demand

A well has a rate at which water flows back into it. If household demand exceeds that rate for long enough, the level falls toward the pump intake regardless of how good the pump is. Long showers, laundry and irrigation in the same hour are the usual trigger.

What it looks like from inside the house

Water that runs fine for ten minutes and then goes to air and sputter, recovering after an hour or two, is a yield pattern rather than an equipment pattern. Equipment faults do not usually heal themselves while you wait.

Yield falls over time

Wells lose capacity as mineral deposits, biological growth and sediment close off the water-bearing zones. Penn State Extension lists the warning signs as a decreased pumping rate, a decreased water level, decreased specific capacity, increased sand or sediment, and a decreased total well depth — and treats a 25% or greater loss of yield as the point at which rehabilitation is in order.

Source: Penn State Extension, Water Well Maintenance and Rehabilitation.

The answers are not always a pump

Storage, a lower pump setting, a different pump curve and well rehabilitation are all answers to a yield problem. A bigger pump usually is not: it draws the level down faster and reaches the intake sooner.

On a well, nobody else is going to notice it failing.If the pressure has gone or the pump is cycling, that is worth a call today rather than next week. We route to contractors who work on wells specifically and cover your area, matched on the ZIP code you give, and you are never charged. Nor does it have to be the well; any plumbing work is routed the same way.

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