Deep well.
Pressure valve located on front of above-ground-storage-tank will turn pump on-off depending on amount of water pressure inside tank.
When water is consumed inside home, the pressure valve responds to the lower pressure and closes electrical contacts... sending electricity to water well pump located deep underground.
The pump turns on and lifts water through a pipe into the above ground storage tank.
When the tank is full of water, the pressure valve senses the higher pressure and turns off electricity going to pump
Pump shuts off.
There is a one-way check valve on the water line going down to pump, and this keeps water from flowing back down into well.
The above ground tank maintains water pressure for the house.
When pressure is reduced by taking a shower, the pressure valve turns pump on again, and cycle repeats.
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