Well Pump Types: Complete Guide

Shallow well jet pumps are installed above ground, typically in a pump house, basement, or utility room. They create suction by forcing water through a jet nozzle, which creates a vacuum that pulls water up from the well. The fundamental limitation is physics: suction can only pull water up a maximum of about 25 feet against atmospheric pressure. In practice, the effective limit is closer to 20 to 22 feet. If your well is deeper than 25 feet, a shallow well jet pump will not work. These pumps are less common in new construction since most modern wells are drilled deeper for better water quality and drought resistance. They are still found on older properties and in regions with high water tables. Replacement is simpler and cheaper than submersible pumps because the pump is accessible above ground -- there is no need to pull equipment from inside the well casing.

Deep well jet pumps work for wells between 25 and approximately 100 feet deep. The motor and pump housing sit above ground, but a jet assembly (nozzle and venturi) is lowered inside the well casing to the water level. Two pipes run from the above-ground pump down to the jet assembly: one pipe sends pressurized water down to the jet, and the other returns water (mixed with fresh supply) back up. This two-pipe system allows the pump to effectively pull water from depths beyond what a single suction can achieve. Deep well jet pumps are less efficient than submersible pumps because some of the water pumped down to the jet is recycled rather than delivered to the pressure tank. Replacement is easier than a submersible since the motor is accessible above ground, though the jet assembly inside the well must also be retrieved if it needs servicing.

Submersible pumps are the dominant type for residential wells drilled below 25 feet. The entire motor and pump assembly sits inside the well casing, submerged in water at a depth typically set 10 to 20 feet above the well bottom. Water is pushed up through the drop pipe to the pressure tank and into the home -- no suction is involved. Submersible pumps are more efficient than jet pumps because they push water rather than pulling it, and the motor is cooled by the surrounding well water. The trade-off is service access: replacing a submersible pump requires pulling the drop pipe and pump assembly from inside the well, which requires special equipment and takes significantly more labor time than replacing an above-ground pump. Labor time, and therefore cost, scales with well depth. Pulling a pump from 50 feet takes about 1 to 2 hours; pulling from 300 feet takes half a day.

For wells deeper than 150 feet, submersible pump costs rise significantly with depth. The pump unit itself may need more horsepower to push water up from greater depth, which means higher pump cost. The drop pipe is longer, adding material cost. Most importantly, the labor to pull and reset a pump from 300 to 400 feet is a half-day job requiring specialized equipment. Every 100 additional feet adds roughly $200 to $400 in labor cost. For the deepest wells (300 to 400+ feet), expect to pay $2,500 to $5,000 total for a pump replacement. In high hard-rock regions of New England, the Appalachians, and parts of the Mountain West, very deep wells are common. Homeowners with these wells should budget accordingly and consider replacing the pump proactively when it approaches the end of its service life (10 to 15 years) rather than waiting for failure during a weekend or holiday.

Constant pressure pump systems use a variable frequency drive (VFD) controller to vary the pump motor's speed in real time, maintaining a nearly constant water pressure regardless of demand. A standard pump runs at full speed or not at all, causing pressure to vary between the cut-in and cut-off set points (typically 40 and 60 PSI). A constant pressure system maintains 60 PSI continuously by running the pump at whatever speed is needed to match current demand. The benefits are noticeably consistent water pressure, reduced pump motor stress from fewer hard starts, and better performance during high-demand periods. The cost premium is $500 to $1,500 over a standard submersible installation. Constant pressure systems are particularly valuable in homes with irrigation systems, multiple bathrooms, and any situation where pressure consistency matters. They are also a smart choice when replacing a pump in an existing system to improve everyday experience.