What is the most common well pump size?
The most common well pump size is a 1HP, 4” diameter submersible pump. A 1HP water pump is pretty versatile, and does the job for wells up to 400 feet deep.
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You won’t need a very powerful water pump to lift 30 feet. If you’re pumping out of a well, I would say a 1/2 HP or 3/4HP submersible well pump will easily be up to the task.
You won’t need a very powerful water pump to lift 20 feet. If you’re pumping out of a well, I would say a 1/2 HP or 3/4HP submersible pump will easily be up to the task.
Should you oversize or undersize your submersible well pump? It's hard to recommend doing either as you should try and find the pump that fits your needs the best, and fits the gallon per minute rate of your well.