If you are installing a new well and well pump, do not forget to purchase and install a pressure tank too. People who are new to how a modern well works often forget this important piece of well equipment, and then do not understand why they cannot get water into their homes or get adequate water pressure. Since the pump just pumps the water from the well into the plumbing lines, you need something with power to draw the water and disperse it with consistent pressure. That is what the pressure tanks in wells do. Here is a little bit more on how pressure tanks for wells and well pumps work and why you need a pressure tank.

From the Well Pump to the Pressurized Holding Tank

The well pump pumps water from the well into a pressurized holding tank. The tank holds onto several gallons of water at a time, and signals your well pump when the water drops below a certain level so that the pump can restore water levels for future use. Then the pressure tank increases the amount of pressurized air inside the holding tank so that the water is ready to enter your home's plumbing lines the minute you turn on a spigot or faucet.

The Pressure Tank Maintains the Pressure

Even when you are not using any water at all, the pressure tank maintains the correct pressure in the holding tank and the plumbing lines at all times. When you finally do need some water, the faucet handles act as pressure release valves, allowing the built-up pressure in the lines to escape with the flowing water from the holding tank. If you leave the faucets open for a long time (e.g., when you take a shower), the pressure tank kicks in and begins to build up more pressure to make up for the lost volume of air and pressure that is currently escaping through your spigot or shower head.

Why You Need the Pressure Tank for Your Well Water

City water gets its pressure from the city's pressurized lines. When you have a well, you have zero pressure, so the water cannot work against gravity or move through your pipes with any consistency. No pressure means no water or only as much water as the vacuums in the pipelines current have. This means you cannot shower/bathe, run a dishwasher and/or run a washing machine simultaneously because the water pressure does not exist to move that much water from your well into your home.