The cost of installing a water well pump will depend on several factors, including the type of pump chosen and the complexity of the installation. A wide range of pumps are available, with costs ranging from several hundred dollars to over one thousand dollars. Additional costs may include any necessary permits or other regulatory fees. The cost of replacing a well pump varies greatly by the type of pump, its depth and location, and the size of your well. A trusted V3 Resource Cost m. professional can provide detailed pricing information specific to your well pump installation.