What is a Well Yield Test?

A Well Yield Test determines the balance between the maximum amount of water that can be pumped out of the well and the amount of water that recharges back into the well from the surrounding ground water source. Balance is achieved when the water level within the well stops dropping for a given discharge rate.

One question well owners ask is how much does my well produce ? Our company minimum requirement on well flow is 3 gallons per minute for 2 hours. We check the flow or yield by pumping water out of the well and measure it. Even though it produced 20 gallons per minute when it was drilled 15 years ago, that may not be the case today. The yield of some wells can actually increase, stay the same, or diminish over a period of time.