Why Is My Water Pressure So Low? (And How to Fix It)

Low water pressure usually comes down to one of five things: a blocked aerator or showerhead, a partly closed stop valve, corroded pipes, a hidden leak, or a drop in the mains supply. The quickest way to narrow it down is to work out whether the problem is at one tap or across the whole house. One tap is almost always a local, often DIY fix. The whole house points to something bigger that usually needs a plumber.

Here is how to find the cause and sort it.

Is It One Tap or the Whole House?

This single question tells you most of what you need to know.

If the weak flow is at one tap or shower only, the cause is local to that fixture: a clogged aerator, a blocked showerhead, or a worn tap. The rest of your plumbing is fine.

If the pressure is low everywhere, the cause sits upstream of your fixtures: a stop valve that isn't fully open, corroded or undersized pipes, a hidden leak bleeding pressure before it reaches your taps, or a supply issue from the mains. This is where a professional diagnosis pays for itself, because guessing means replacing the wrong thing.

What Causes Low Pressure at One Tap

The usual culprits, easiest first:

• A blocked aerator. The small mesh screen on the tap spout traps sediment and mineral scale over time. Unscrew it, rinse it, and check the flow.

• A clogged showerhead. Same problem, bigger surface. Soak it in white vinegar overnight to dissolve the buildup.

• A worn or faulty tap. If cleaning the aerator does nothing, the tap internals may be the restriction. A dripping or worn tap often shows up as pressure loss too.

What Causes Low Pressure Across the Whole House

When every outlet is weak, look at these:

• A partly closed stop valve. Your main shut-off, usually near the water meter, may have been knocked or left half-closed after work on the system. Check it's fully open first. It's the five-second fix people miss.

• Corroded or ageing pipes. Older Northern Rivers homes still run galvanised steel or old copper. As these corrode internally, the pipe narrows and flow drops. Severely corroded pipe can lose half its internal diameter.

• A hidden leak. Water escaping before it reaches your taps means less pressure at every outlet. A hidden leak is one of the most common and most overlooked causes, and it drives up your bill at the same time.

• Mains supply. Occasionally the drop is on the network side. If your neighbours have the same problem, it's worth checking with Rous County Council, which supplies water across the Ballina and wider Northern Rivers area, before assuming it's your plumbing.

Why Coastal Homes Here Lose Pressure Faster

Homes close to the coast in Lennox Head, Ballina, and Byron Bay wear through pipework faster than inland properties. Salt air accelerates corrosion on older metal pipes and fittings, and sandy coastal soil shifts over time, stressing underground lines and opening up the small cracks where leaks start. If you own an older coastal home, gradual pressure loss is often the first sign of pipework reaching the end of its life. There's more on this in the guide to why coastal homes have more plumbing problems.

How to Test Your Water Pressure at Home

You can check your own pressure with a gauge from any hardware store:

1. Turn off every tap and water-using appliance in the house.

2. Screw the gauge onto an outdoor tap closest to the water meter.

3. Open that tap fully and read the dial.

Most homes should sit between 40 and 80 psi. A reading well below that confirms a genuine pressure problem rather than a single blocked fixture.

When Low Pressure Means a Hidden Leak

Here is the test that matters most. Turn off every tap and appliance in the house, then check your water meter. If the meter is still ticking over with everything off, water is escaping somewhere in the system. That is a leak, and it explains both the weak pressure and any recent jump in your bill.

A hidden leak will not fix itself and gets worse with time. This is exactly what JF Plumbing's leak detection service is built for. Jesse uses acoustic and thermal equipment to pinpoint the exact spot without tearing up walls or floors, so the repair is targeted rather than exploratory. If your pressure loss lines up with a water bill that has crept up, the two are almost certainly connected.

Frequently Asked Questions

Why do I suddenly have low water pressure? A sudden drop usually points to a new fault: a valve knocked partly shut, a pipe that has started leaking, or a mains supply issue. Gradual loss over months is more likely corrosion or scale buildup.

Can low water pressure fix itself? If the cause is council mains work, yes, it returns once the work finishes. If the cause is a leak, corrosion, or a blocked fixture, no. It stays the same or gets worse until it's fixed.

Who is responsible for low water pressure? Anything on your side of the water meter is the homeowner's responsibility. Pressure issues in the mains before the meter sit with the water supplier. The meter test above tells you which side the problem is on.

Does a water filter reduce water pressure? A correctly sized, well-maintained filter should not. A clogged filter cartridge can. If pressure dropped after a filter was installed, the cartridge or the sizing is worth checking.

Weak pressure across the whole house rarely fixes itself, and a hidden leak behind it only gets more expensive. Get it diagnosed properly across the Northern Rivers. Call Jesse now on 0412 230 635.