Water Pressure Solutions You Can Count On

Fix Low, Weak, or Inconsistent Water Pressure With Help From Local Experts

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What Locals Are Saying About Our Plumbing Services

    
 
 
         
   Kym Eley 
 
 
 
 Trustindex verifies that the original source of the review is Google. Mark helped install my fridge water line. Was really impressed with his workmanship, customer service and price. Would absolutely use again!
  
 
        
   Angus Pastuszka 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had a blocked up down pipe and nothing we couldn’t do it ourselfs and called up and was quick to respond and ready to work and unblocked it without a worry and without charging us cheers mark
  
 
        
   William Grech 
 
 
 
 Trustindex verifies that the original source of the review is Google. Mark came out and did a great job, very friendly, and would recommend
  
 
        
   Natalie 
 
 
 
 Trustindex verifies that the original source of the review is Google.

Tired of Weak Water Flow?

Poor water pressure is more than a frustration — it affects your shower, your appliances, and your daily routine. At MW Donnelly Plumbing, we provide professional water pressure testing, diagnosis, and repair across Sunbury, Gisborne, Craigieburn, Bacchus Marsh, and surrounding areas.

Whether you’re dealing with low water pressure, fluctuating flow, or high pressure that’s damaging your fittings, our team gets to the root of the issue — and fixes it properly.

Common Water Pressure Problems We Fix

Weak shower flow
Slow-filling washing machines and dishwashers
Taps that trickle instead of flow
Pipes that bang or vibrate (water hammer)
Fluctuating hot and cold pressure
Pressure too high – damaging tapware
Pressure drops when multiple taps are used

We use specialist testing equipment to measure pressure at your mains, valves, and fixtures — so we can locate the exact point of failure and apply the correct fix.

What Causes Water Pressure Problems?

There’s no one-size-fits-all answer. That’s why we perform a complete system assessment. Common causes include:

Corroded or narrowed internal pipework
Faulty or ageing pressure-limiting valves
Blockages in aerators or fixtures
Faulty hot water unit valves
Water leaks within the system
Incorrect pipe sizing in older homes
Shared water mains with multiple properties
Council supply pressure fluctuations

Whether it’s a single tap or your whole house, Mark and his team are equipped to get your flow back to normal.

Solutions Tailored to Your System

Once we’ve identified the problem, we recommend the most effective (and cost-effective) fix, which may include:

Replacing faulty or old pressure-reducing valves (PRVs)
Flushing out blocked tap filters and aerators
Replacing corroded or kinked pipework
Upgrading to larger diameter pipes
Installing a pressure-limiting valve on your water meter
Adjusting hot water system regulators
Detecting and repairing hidden water leaks
Rebalancing dual pressure systems for consistent flow

We explain your options clearly — no pushy upsells, just professional advice that fits your budget and household needs.

How It Works

Step 1: Enquire or Call

Tell us about your issue — we’ll schedule a time that works for you.

Step 2: On-Site Testing

We use pressure testing tools to measure static and flow pressure at multiple points.

Step 3: Identify the Cause

We locate the fault and explain what’s wrong in clear, non-technical terms.

Step 4: Repair or Upgrade

We apply the most appropriate fix — whether that’s replacing a valve, rerouting pipes, or flushing your fixtures.

Step 5: Final Testing

We ensure water pressure is safe, reliable, and consistent before we leave.

Benefits

Precise diagnosis with pressure testing tools
Permanent solutions, not temporary fixes
Help with both low and high pressure issues
Options explained clearly – no surprises
Fixtures, valves, and pipework all checked
Fully licensed and insured plumbers
Fast service in Sunbury & surrounding VIC suburbs
Workmanship backed by guarantee

Clients who trust us

We’re trusted by:

Homeowners fed up with poor showers or slow dishwashers
Elderly residents needing easier tap access
Property managers responding to tenant complaints
Builders needing balanced pressure for new builds
Families experiencing loud pipes or pressure surges
Households in split-level or shared-main homes
Customers replacing old hot water systems with better pressure regulation

Gallery

Frequently Asked Questions

Why is my water pressure so low in just one tap?

It may be a blocked aerator or internal tap fault. We can clean or replace the part quickly.

Can you increase pressure in the shower?

Yes — we can assess and adjust your pressure legally and safely, often by replacing valves or clearing blockages.

Is high pressure a bad thing?

Yes. Pressure over 500 kPa can damage appliances and void warranties. We install pressure-limiting valves to protect your system.

How long does it take to fix water pressure problems?

Most issues are diagnosed and repaired on the same day, depending on parts required.

Can you service rural or semi-rural properties with tank systems?

Yes. We help customers on tank, pump, and gravity-fed setups with pressure regulation solutions.

Kym Eley

Mark helped install my fridge water line. Was really impressed with his workmanship, customer service and price. Would absolutely use again!

Angus Pastuszka

We had a blocked up down pipe and nothing we couldn’t do it ourselfs and called up and was quick to respond and ready to work and unblocked it without a worry and without charging us cheers mark

William Grech

Mark came out and did a great job, very friendly, and would recommend

Natalie