Why Your Water Pressure Keeps Dropping
There are few things more quietly maddening than a shower that loses pressure halfway through, or a kitchen tap that delivers a trickle when you need a steady stream. At Murrayville Plumbing, we hear about this one constantly, because water pressure can often drop in homes for reasons that aren’t always obvious from the outside. The good news is that most causes are identifiable, and some you can even check yourself before picking up the phone.
The Most Common Reasons Pressure Drops
Sediment and Mineral Buildup in Your Pipes
Over years of use, without proper plumbing maintenance, the minerals naturally present in your water supply (calcium, magnesium, iron, etc.) gradually deposit along the interior walls of your pipes. The result is a narrowing of the pipe’s internal diameter that restricts flow and steadily chips away at your pressure. This tends to happen slowly enough that homeowners don’t notice until the buildup is significant.
A few things worth knowing:
- Older homes with galvanized steel pipes are especially vulnerable to this
- The buildup is often concentrated near elbows and joints where flow slows
- Pressure loss from mineral buildup tends to be gradual, not sudden
If you’ve noticed your pressure declining over months rather than appearing overnight, this is worth having assessed.
A Failing Pressure Regulator Valve
Many homes connected to municipal supply lines have a pressure regulator valve (PRV) installed where the main line enters the house. Its job is to bring high incoming pressure down to a range that’s safe for your home’s fixtures and supply lines, typically somewhere between 50 and 60 PSI.
When a PRV begins to fail, pressure can behave unpredictably: spiking at some fixtures, dropping at others, or fluctuating throughout the day with no clear pattern. Most homeowners don’t know this valve exists until it starts causing problems. PRVs have a finite lifespan, and a failing one is a common culprit behind the kind of inconsistent pressure that’s hard to explain any other way.
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Hidden Leaks in Your Supply Lines
A leak doesn’t have to be visible to affect your pressure. When supply lines develop cracks or pinhole leaks, whether underground, inside walls, or beneath a slab, water diverts away from your fixtures before it ever reaches them. The pressure drop you feel at the tap is the downstream effect of water going somewhere it shouldn’t.
Watch for these signs alongside your pressure issues:
- A noticeable increase in your water bill without a change in usage
- Soft or damp patches in your yard, particularly along the path of supply lines
- The sound of running water when every tap in the house is off
- Unexplained moisture near your foundation
Hidden leaks are worth treating with urgency. Structural damage from prolonged moisture is a far more expensive problem than the leak itself.
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Clogged Aerators at the Fixture
Not every pressure problem starts in the pipes. Aerators, the small mesh screens threaded onto your tap spouts, catch sediment and debris over time. When they clog, they create the impression of a pressure drop even when the rest of your supply system is functioning perfectly.
A quick check worth doing first:
- Unscrew the aerator from the affected tap
- Rinse it under water and clear any visible buildup
- Reinstall and test
If pressure returns to normal at that fixture, you’ve found your answer. If multiple fixtures are affected, or if cleaning the aerator doesn’t help, the problem is deeper in the system.
Municipal Supply Fluctuations
Sometimes the issue isn’t your plumbing at all. City water pressure can dip during periods of high demand, after a main break, or during planned maintenance. Before assuming the problem is inside your home, check with a neighbour. If several households on your street are experiencing the same thing simultaneously, you’re likely dealing with a temporary supply issue on the municipal side that will resolve on its own.
When to Call a Plumber
Some pressure problems are good candidates for the check-first approach. Others aren’t. Here’s a simple way to think about it:
Check it yourself first if:
- Only one fixture is affected
- The issue started recently and is mild
- You haven’t ruled out the aerator yet
Call us if:
- Multiple fixtures are affected throughout the house
- Pressure drops are sudden, severe, or getting worse
- You’re seeing signs of a hidden leak
- You’ve cleaned the aerator and pressure hasn’t improved
- Pressure is inconsistent with no clear pattern
Pressure problems that go unaddressed have a way of becoming something bigger. What starts as a minor leak or a corroding regulator can escalate into water damage, pipe failure, or repair costs that none of us want to deal with.
Your Neighbours at Murrayville Plumbing Are Here
When something as fundamental as your water pressure isn’t working right, it affects your whole household, and that frustration is real. At Murrayville Plumbing, our team is available 24 hours a day because plumbing problems don’t follow a convenient schedule, and the families in our community deserve to have someone ready when it counts. If your pressure is dropping and you’re not sure why, give us a call at 778-888-6451. We’ll help you figure out what’s actually going on and get things back to normal.