A pump can raise water pressure when your home's supply is too weak

If your tap flow is weak even when nothing else is running, a booster pump can increase the pressure throughout your home or to a single fixture. The pump sits between your water line and your plumbing, drawing water in at low pressure and pushing it out at higher pressure. Most home systems use either a jet pump (for wells or low-pressure lines) or a centrifugal pump (for municipal water that just needs a boost). A pump won't create water that isn't there—it only pressurizes what arrives—so if your pressure is low because your water main is undersized or your meter is clogged, a pump will help but won't solve the root problem.

Before buying a pump, measure your current pressure with a pressure gauge (available at any hardware store for $10–20). Screw it onto an outdoor faucet or a hose bib. Normal household pressure is 40 to 80 pounds per square inch (psi). Below 40 psi feels weak; below 20 psi makes showers and washing machines struggle. Write down your reading—you'll need it to choose the right pump size.

Key Takeaways

  • A booster pump increases water pressure by drawing in low-pressure water and pushing it out harder, but it cannot create water that isn't arriving at your home.
  • Measure your current pressure with a gauge on an outdoor faucet before shopping; normal household pressure is 40 to 80 psi.
  • Jet pumps work for wells and very low pressure; centrifugal pumps work for municipal water that needs a modest boost.
  • Installation requires shutting off your main water valve, cutting into your supply line, and mounting the pump with check valves and a pressure tank to prevent damage.
  • A whole-house pump costs $300–$800 plus installation; a single-fixture pump for one shower or sink costs $100–$300 and requires no plumbing work.

Jet pumps for wells and very low pressure

A jet pump is designed to pull water from a well or from a municipal line where pressure has dropped to almost nothing. It uses a venturi (a narrow throat inside the pump) to create suction, drawing water in even when the incoming pressure is near zero. Jet pumps are noisier and less efficient than centrifugal pumps, but they work when nothing else will.

Jet pumps come in two styles: shallow-well (for wells up to 25 feet deep) and deep-well (for deeper wells). If you're boosting a municipal line rather than a well, a shallow-well jet pump is usually the right choice. Jet pumps typically cost $200–$400 and need a pressure tank (a steel tank that stores pressurized water and smooths out the pump's on-off cycling). The tank prevents the pump from running constantly and extends its life.

Centrifugal pumps for municipal water that needs a boost

A centrifugal pump is simpler and quieter than a jet pump. It uses a spinning impeller to push water outward, so it works best when there is already some incoming pressure—at least 10 to 15 psi. If your municipal water arrives at 20–30 psi and you want to raise it to 50–60 psi, a centrifugal pump is the standard choice.

Centrifugal pumps are smaller and cheaper than jet pumps (typically $150–$350) and don't always need a pressure tank, though one is still recommended to reduce the pump's run time. They are also more efficient, meaning lower electricity bills over time. Most home booster systems use a centrifugal pump because municipal water already has some pressure to work with.

Whole-house installation: cutting into your main line

Installing a pump for your entire home requires shutting off your main water valve and cutting into the supply line where it enters your house. This is permanent plumbing work and is best done by a licensed plumber, though experienced homeowners can do it if they follow code.

The basic steps are: shut off the main valve, drain the line by opening a faucet, cut the pipe with a hacksaw or pipe cutter, install a check valve on the inlet side of the pump (this prevents backflow), connect the pump outlet to a pressure tank, and run a line from the tank to your home's plumbing. A check valve is essential—without it, water can flow backward through the pump when it shuts off, damaging the impeller. The pressure tank stores water and prevents the pump from turning on and off dozens of times a day.

The whole process takes 4 to 8 hours for a plumber and costs $300–$800 for the pump and tank alone, plus $500–$1,500 in labor depending on your location and how straightforward your supply line is to access. If your line is buried deep or runs through concrete, costs climb higher.

Single-fixture pumps for one shower or sink

If only one fixture has weak pressure—a shower, a kitchen sink, or an outdoor hose bib—a single-fixture booster pump is much simpler. These small pumps mount directly under the sink or behind the fixture and boost pressure only for that one outlet. They cost $100–$300 and require no cutting into your main line.

Installation means turning off the water to that fixture, unscrewing the supply line, screwing the pump onto the inlet, and plugging it in. Most single-fixture pumps are electric and draw very little power. They turn on automatically when you open the faucet and shut off when you close it. The downside is that they only help one fixture, so if your whole house has low pressure, you would need multiple pumps or a whole-house system instead.

Pressure tanks and check valves: why they matter

A pressure tank is a steel or composite tank partially filled with air and water. As the pump fills it, the air compresses, storing energy. When you open a faucet, the compressed air pushes water out without the pump running, so the pump cycles on and off rather than running constantly. This saves electricity and extends the pump's life from a few years to 10 or more.

A check valve is a one-way valve that lets water flow into the tank but not back out through the pump. Without it, when the pump shuts off, water pressure in the tank pushes backward through the pump, spinning the impeller in reverse and damaging it. Check valves are inexpensive ($15–$40) and essential for any pump system. Install one on the pump's inlet side (the side water enters) and sometimes a second one on the outlet side, depending on your plumber's recommendation.

Common mistakes that damage pumps or waste money

The most common mistake is installing a pump without a check valve. Water flows backward through the pump when it shuts off, the impeller spins in reverse, and the pump fails within months. Always install a check valve on the inlet side, no matter what.

Another mistake is choosing a pump that is too small for your needs. If you want to raise pressure from 20 psi to 60 psi and your home uses 10 gallons per minute at peak (shower plus washing machine), you need a pump rated for at least 10 gpm at that pressure. A pump rated for 5 gpm will struggle and overheat. Check the pump's spec sheet for flow rate at your target pressure, not just the pump's maximum flow.

A third mistake is installing a pump without a pressure tank. The pump will run every time you open a faucet and shut off the when ready you close it, cycling hundreds of times a day. This wears out the motor and wastes electricity. A tank costs $100–$300 but pays for itself in reduced wear and energy use.

Finally, do not assume a pump will fix pressure that is low because your water main is undersized or your meter is clogged. A pump can only pressurize water that arrives. If your pressure drops when a neighbor uses water, your main is too small and a pump won't help much. If pressure is low everywhere in your home even at 2 a.m., your meter or service line may be blocked. Have a plumber check before you buy a pump.

Frequently Asked Questions

How much does a booster pump cost to install?

A whole-house pump and tank cost $300–$800 for equipment, plus $500–$1,500 in labor. A single-fixture pump costs $100–$300 with no labor. Total cost varies by your location, how accessible your water line is, and whether you hire a plumber or do the work yourself.

Will a pump work if my water main is too small?

A pump can only pressurize water that arrives at your home. If your main line is undersized, a pump will boost the pressure of whatever water gets through, but the total flow will still be limited. If pressure drops when neighbors use water, your main is likely the problem, and a pump is only a partial fix.

Do I need a pressure tank with a booster pump?

A pressure tank is not always required, but it is strongly recommended. Without one, the pump runs every time you open a faucet and shuts off when ready when you close it, cycling hundreds of times daily. This wears out the motor quickly. A tank stores pressurized water and lets the pump run less often, extending its life and saving electricity.

Can I install a booster pump myself?

Single-fixture pumps are straightforward to install—just screw one onto a supply line and plug it in. Whole-house pumps require cutting into your main water line, which is permanent plumbing work. If you are comfortable with plumbing and your local code allows it, you can do it, but most homeowners hire a licensed plumber to may support it is done correctly and to the code.

What pressure should I set my pump to?

Most homes are comfortable at 50–60 psi. Higher pressure (above 80 psi) can damage fixtures, hoses, and water heaters over time. Check your pump's manual for how to adjust the pressure switch, or ask your plumber to set it during installation. You can also use a pressure gauge to check the output and fine-tune it.