Typically, well pump installations are done shortly after the drilling of a well. This is especially true for the types that go down in the same hole as the well. In that case, the hole has to be open to install the pump, so doing it when it will already be open simply makes sense. If the pump will reside above ground, however, the main well hole will typically be capped. Plumbing will run from the side of the well pipe to the pump to connect the two.

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Deep well pump installation almost always involves a submersible pump, so it won't take long to get it installed after a new well is dug. However, if you need to replace an old pump, the time will be longer. This is because the installers have to get the pumps through a longer pipe. First, the old one is pulled up, and then, the new one is lowered into position. The length of the pipe will also be a factor when it comes to hooking up the electrical power for the pump.

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If you already have a well and pump, you may think that you'll never need to worry about deep well pump installation again. Unfortunately, this is not actually the case. Well pump installations can be required every 15 or 20 years, with outliers on each side of this range. Mechanical failure is usually the reason for needing a new pump.

The length of time needed for installation depends on whether the pump is an above-ground type or a submersible. Above-ground pumps are easy to work on or replace because they are so accessible, and this is one of the biggest benefits of this style. However, not all wells will work with an above-ground pump, so the specifics of the well determine the type of pump to use.​