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How Does a Water Pressure Tank Work?

If you are running a private water system for your property, then you probably have a water pressure tank installed somewhere on your lot.

May 05, 2026
How Does a Water Pressure Tank Work?

If you are running a private water system for your property, then you probably have a water pressure tank installed somewhere on your lot. While homeowners may regularly see that water pressure tank regularly, they might not know how the unit works. Don’t worry. Your friends here at Mr. Rooter Plumbing of Central New Jersey are ready to break it down for you. Understanding how the water pressure tank works can help you detect when the water pressure tank is acting up and needs repair. If you do need plumbing repair service for your water pressure tank, then feel free to call Mr. Rooter Plumbing of Central New Jersey. Our dedicated plumbers are always happy and ready to help.

How Does It Work?

A water pressure tank works in conjunction with your water supply, generally a well, to get water to your plumbing fixtures. Here’s how it works.

Our Customers Reviews

Larry R.

Howell Township, NJ

It was a late Saturday night. We had a super stubborn clog in some old galvanized pipes. Mr. Rooter send out Phil. Phil was great! He found the problem pretty quick. With determination and professionalism he final got it cleared out. I would recommend Mr. Rooter and Phil to anyone! He even cleaned up. We are so happy we choose Mr. Rooter!

Rose Bernard

Red Bank, NJ

We had a plumbing emergency and found Mr. Rooter while frantically searching for a 24-hour plumber. We feel like we hit a gold mine. Not only did we get a timely response. Everyone at Mr. Rooter was friendly, professional, competent and went above and beyond. Our plumber, Phil, was extremely helpful and gave us tips we could use moving firwars. Not to mention, the cost was extremely reasonable.

Joseph Chis

Hillsborough, NJ

Had sewer water backup in toilet and tub. Received callback as promised and arrived early. The tech determined we needed the main line to be cleared. He quickly located the opening and had us cleared in minutes. Very happy with the service. I was not prepared for the fee but it was an emergency.

Christopher Cox

Little Silver Township

Plumber, Phil, came out on short notice on a Saturday night and fixed our issue quickly, professionally and courteously. I contacted a different, well known plumbing company right before Mr. Rooter. The receptionist was rude and they didn’t call me back to say they couldn’t make it until after Phil left! The Mr. Rooter receptionist was very nice and they called me back quickly. I’m glad they did.

Debbie Dimitrion

Colts Neck, NJ

I just wanted to say James did a great job at my house. Excellent service, professional and very nice. Thank you so much for helping me with my plumbing problem. Did wonderful job.

Rachel Turunen

Jackson Township

I was very happy that I went with Mr. Rooter’s. The service was very quick and up front. Jessie James was very helpful answering my questions and replacing my hot water heater. He was pleasurable to do business with. If another problem arises in my home, I will be using this company again.

William Holden

Brick Township, NJ

A thorough, professional, pleasant experience. I had a back-up in the 50 year-old pipes of my new home. I called Mr. Rooter to have them locate the blockage, snake the line, and then use their video snake to get a visual of the integrity of the pipes. I’m glad that I called and will use them again for future needs.

LarJ MarJ

Oakhurst, NJ

You get what you pay for. Edwin Robles of Central NJ educated me as a 1st time homebuyer on why and what he was repairing, prevention, PROMPT,(on a sunday at that!) clean, knowledgeable, super professional but DOWN TO EARTH and at a REASONABLE PRICE! Sewer pipes unclogged and main water line fixed. I was no longer crying once job was thoroughly executed. After all $#@* $tinks but somebody has to do it and I HIGHLY recommend him and this company for a job well done. THANK YOU VERY MUCH!!

Margie Rafferty-Criscione

Ocean Township

Absolutely lovely office staff! I always knew when the repair person was coming. Lorenzo our repair guy was awesome, I really don't think there is anything he can't do. He looks young, but don't let that fool you! So happy all the repairs are behind us. We really just did a one-stop shopping and decided to have everything we've put off fixed because it was such a tremendous experience!

How Does a Water Pressure Tank Work?

The well pump delivers water to the water pressure tank. When water is pumped into the tank containing air with nowhere to go, both the water and air in the tank are put under pressure. When the water in the tank reaches a specified degree of pressure, generally 40-60 PSI (pounds per square inch), the pump automatically shuts off to prevent damage.

As you tu on your faucets and showerheads, the water leaves the water pressure tank. As a result, the pressure in the tank decreases. When the pressure gets low enough, to around 20 to 40 PSI, the pump starts again.

What’s The Point of a Water Pressure Tank?

You might be asking yourself, "Why involve the water pressure tank when the well pump can get the water out of the well anyway?" There are a few reasons why.

First, the well pump generally does not offer enough pressure to be useful for plumbing fixtures. Many water-using fixtures require at least 10 PSI to operate properly. Appliances such as dishwashers and laundry machines require even more.

Even if the well pump did produce enough pressure, constantly activating and deactivating the well pump will wear out the pump and reduce its life expectancy. The water pressure tank builds up a reserve of pressurized water so that the well pump does not have to start and stop so often.

Finally, the water pressure tank offers a reserve supply of water that you can use during times of high demand. Otherwise, you would probably have a tough time trying to take a shower and run the dishwasher at the same time.

Possible Issues with the Water Pressure Tank

To no surprise, the water pressure tank IS susceptible to damage and failure. One common issue is a leak. If the unit loses air supply, then the pressure will take a hit. Another issue is waterlogging. This is when the unit overfills with water. Again, the consequence is low water pressure.

If you rely on private water and your plumbing fixtures are delivering low water pressure, then call Mr. Rooter Plumbing of Central New Jersey to have your water pressure tank inspected. Our plumbers are experienced, trained, and equipped to resolve that issue the first time around.

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