6 Reasons for Low Water Pressure After Installing a New Faucet

why is water pressure low after installing new faucet

Are you experiencing low water pressure after installing a new faucet? This can be a common issue, but it doesn’t mean you must live with it.

Proper water pressure is crucial for a functioning faucet; without it, daily tasks such as washing dishes or taking a shower can become frustrating.

Post-faucet installation, it’s not uncommon for homeowners to report a noticeable drop in water pressure.

The good news is that this issue can often be fixed quickly once you understand what’s causing it.

This blog post aims to help you identify the six most common reasons for this problem and provide quick, easy solutions to restore your faucet to optimal performance.

1. Air Trapped in Pipes

Tell you a little secret about plumbing: Air can sometimes become trapped in your pipes following a new faucet installation, leading to low water pressure.

It’s similar to what happens when you’re trying to drink a soda with a straw, but there’s some air trapped inside.

You struggle to get a proper sip, don’t you? So imagine your pipes trying to deliver water with air bubbles obstructing the flow!

How to Bleed Air from the System

Now, onto the good part – how to get rid of this pesky air! Here’s what I did when this happened to me.

I started at the lowest faucet in the house, which for me was the outdoor garden hose, and allowed the water to run.

Slowly, I moved upwards to each faucet in the house, letting the water run until I saw no more air bubbles coming out.

This process, known as “bleeding,” is a simple and effective technique to restore your water pressure to its former glory.

Just remember to start from the lowest faucet and work your way up – it worked for me, and I’m sure it will for you, too!

2. Clogged Aerators

Let’s now dive into another common culprit of low water pressure – clogged aerators. But what exactly are these, you ask?

Great question! Aerators are small devices attached to the end of your faucets. They are designed to mix air with the water flow to prevent splashing and help conserve water.

But like everything else, aerators can get clogged over time, significantly reducing water pressure.

You might recall an incident with my kitchen faucet last year. I was surprised to find the water trickling out when I tried to fill up a pot for cooking.

After some investigation, I discovered the aerator was the culprit. It was clogged with mineral deposits, slowing the water flow to a trickle!

Cleaning or Replacing Clogged Aerators

So, what can you do when faced with a clogged aerator? Fear not I have a solution for you.

Cleaning or replacing a clogged aerator is straightforward and doesn’t require a call to the plumber.

I started by unscrewing the aerator from the faucet, and it was immediately apparent that it was clogged with lime and mineral deposits.

I gently scrubbed the debris off using an old toothbrush and some vinegar.

If cleaning doesn’t do the trick, you may need to replace the aerator.

I’ve found that most hardware stores have a variety of aerators to choose from, and they are usually quite budget-friendly.

Remember to take your old aerator to the store to ensure you get the correct size for your faucet.

I restored the water pressure in my kitchen faucet by cleaning or replacing my aerator. I found it rewarding and easy to do.

So you know where to start next time you face a similar issue!

3. Partially Closed Valves

We might not even consider one of the most straightforward reasons for low water pressure – partially closed supply valves.

Let me tell you what happened to me last winter. One day, I noticed the water pressure in my bathroom faucet was surprisingly low.

I checked the aerator, but it was clean. Then it dawned on me. A friend had stayed over recently and might have tinkered with the supply valves under the sink.

To my surprise, that was precisely the case! The supply valve wasn’t fully open.

Partially closed supply valves can significantly reduce your water flow, making it seem as if there’s a problem with your plumbing system when there’s not.

How to Open Supply Valves Fully

So, if you find yourself in a similar situation, fret not! It’s easy to rectify. I learned this the easy way.

First, you need to locate your supply valves. They are typically under the sink for both your kitchen and bathroom faucets.

These valves control the water flow, so you must ensure they are fully open. Turn the valve counterclockwise to open it.

If the valve is hard to turn or doesn’t, it might be time to call a plumber.

But if you can turn it, and the water flow improves, you’ve solved the problem! It’s always satisfying when you can fix an issue without getting professional help.

Before concluding about your water pressure, it’s worth checking the basics, like the supply valves.

4. Plumbing Blockages

Believe it or not, blockages in your plumbing system can also be the culprit behind your low water pressure problem.

I remember this one time when a stubborn blockage in my kitchen sink was causing a lot of trouble.

Identifying Potential Blockages in the Plumbing System

Identifying potential blockages in your plumbing system is no easy task, and I learned this the hard way.

I had noticed low pressure for a few days but shrugged it off, thinking it might be due to the usual reasons like partially closed valves.

However, when the problem persisted, I knew something else was at play.

The water was taking an unusually long time to drain out of my kitchen sink, a classic sign of a blockage.

Clearing Obstructions in Pipes

Clearing obstructions in your pipes can be daunting, but trust me, it can be done.

I decided to tackle the problem myself before calling in a professional plumber.

I headed to the local hardware store and picked up a plumber’s snake, a tool used to unclog drains.

I carefully fed the snake into the drain and cranked it to break up whatever was causing the blockage.

Much to my relief, water started to flow normally again after I removed the snake. However, if you try this and it doesn’t work, don’t hesitate to call a plumber. Sometimes, professional help is necessary.

Remember, knowing how to identify and clear potential blockages in your plumbing system can save you a lot of time and money. It’s all about being proactive and having a bit of patience.

5. Water Pressure Regulator Issues

The water pressure regulator is a crucial component of your plumbing system. Acting like a traffic cop, it controls the flow of water entering your home from the main supply.

Its job is to reduce high pressure to your pipes’ safe levels. Remember when my water pressure was going crazy, fluctuating high and low? Turns out the pressure regulator was the culprit!

How to Adjust or Replace a Malfunctioning Regulator

Adjusting a malfunctioning regulator can be a bit tricky. When my pressure regulator went haywire, I decided to adjust it myself.

With the help of a pressure gauge and an adjustable wrench, I tried to get the pressure back to a safe level.

However, if you’re uncomfortable doing this yourself, or if adjusting doesn’t solve the problem, replacing the regulator might be the best option.

It’s important to remember that working with a pressure regulator involves dealing with high water pressure; hiring a professional is always safer if you’re in doubt.

6. Inadequate Pipe Sizing

Inadequate pipe sizing can significantly impact your water pressure. The size of the pipes in your plumbing system determines the volume of water that can flow through them.

If the pipes are too small, they may not deliver water at the desired pressure. This hit home for me when I remodeled my home and decided to add a new bathroom.

The water pressure in the new fixtures was noticeably lower, and I realized it was due to the pipes being too small.

When to Consult a Professional for Pipe Resizing

Consulting a professional for pipe resizing is a decision you should make when you’ve exhausted other potential causes of low water pressure.

When I faced this issue, I knew it was time to call the experts. Pipe resizing is a significant task involving replacing sections of your plumbing system. It’s not a DIY job for most people, and it was certainly not for me!


In this journey, we’ve covered several potential reasons – from blockages and water pressure regulators to inadequate pipe sizing and their solutions for low water pressure. Each has its telltale signs, and knowing what to look for can save you much hassle.

Remember, it’s okay if you can’t solve all plumbing issues alone. Sometimes, it’s better to seek professional help than risk further damaging your plumbing system.

While you can be proactive and troubleshoot some problems, don’t hesitate to call in the experts when necessary.

As I’ve learned from my experiences, it’s all about striking the right balance between DIY enthusiasm and professional wisdom!


Hi! I’m Kobby, one of the co-owners of favoredstoneguides.com and the newest house owner in town. I’m a huge fan of most things natural. Over here on this site, I'm happy to share all the exciting hacks, tricks, and tips I have learned and continue to learn each day about taking care of natural stones.

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