Concrete Tank Repairs
What You Need to Know About Repairing Concrete Water Tanks
Fixing your concrete tank isn’t just about sealing a leak, it’s about restoring the overall strength, safety, and usability of the tank for the long term.
Most of the problems in old tanks come from how they were first built. The concrete used back then wasn’t as good as what we have now, and many tanks didn’t have proper waterproofing. That’s why, over time, cracks, leaks, and damage start to show up.
At Transform Water, we use a mix of old-fashioned know-how and the latest repair methods to fix your tank properly. We don’t just cover the cracks, we make sure the whole tank is sealed, supported, and ready to keep working for a long time.
Whether your tank holds drinking water, garden water, or stormwater, we’ll make sure it’s safe and works like new again.
Why Repair Instead of Replace?
- Cost-Effective – Repairing is often a fraction of the cost of tank replacement
- Faster Turnaround – Most repairs are completed in 1–2 days
- Eco-Friendly – No demolition or landfill waste
- Longer Tank Life – Adds 10–20+ years to your tank’s lifespan
- Water-Safe – All our coatings and liners are certified for potable water
Concrete Tank Repairs for Modern Efficiency
About 50 years ago, concrete tanks were the most popular rainwater storage tanks available. Most concrete tanks greater than 10,000 litres in size were formed on site. This means that they were built on site and remain there today. These tanks however used concrete with outdated chemistry and inferior waterproofing methods. Some of these tanks had no waterproofing at all.
The problem? These tanks were built using concrete with outdated chemistry and poor waterproofing techniques — many had no waterproofing at all. As a result, concrete tanks today often suffer from leaks, cracks, contamination, and other structural issues that impact water safety and tank lifespan.
At Transform Water, we specialise in concrete tank repairs across Sydney and surrounding areas, using advanced materials, modern waterproofing methods, and where needed, custom bladder installations to breathe new life into your existing tank.
Common Concrete Tank Problems We Repair
No matter if your tank is above or below ground, big or small — we’ve seen it all and fixed it all.
Leaking Concrete Water Tanks
1
Water escaping through cracks, joints, or porous surfaces – usually caused by age, poor waterproofing, or structural stress.
Cracked Tank Walls or Floors
2
Cracks form due to ground movement, heavy water pressure, or ageing concrete – leading to leaks and weakened structural integrity.
Seepage Through Tank Joins
3
Older tanks often have join lines that deteriorate over time, allowing water to seep out slowly, even without visible cracks.
Deteriorating or Crumbling Concrete
4
Concrete can break down after decades of use, especially if exposed to harsh elements or poor-quality mixes during construction.
Exposed Reinforcement or Spalling
5
Steel reinforcements within the concrete can become visible and start rusting, causing concrete to flake or fall away (known as spalling).
Contaminated Water Due to Algae or Bacterial Growth
6
Cracks or leaks allow organic material and bacteria to enter the tank, leading to unsafe, smelly, or discoloured water.
Damaged Tank Lids, Inlets, or Outlets
7
Broken access covers, valves, or overflow outlets can let in debris or pests, compromise water flow, or pose a safety hazard.
Our Concrete Tank Repair Methods
We offer several specialised concrete water tank repair options to fit your tank’s specific needs:
Fixing Structural Cracks:
We use a special epoxy that not only stops leaks but also makes your tank walls strong again. This is great for tanks that need to keep their original structure.
Improving Waterproofing:
Our team uses the newest waterproofing methods that work much better than the old ones. This could mean new coatings or special linings that prevent leaks and protect your tank from damage.
Rainwater Bladder Installation:
If the inside of your tank is really worn out, we can put in a custom bladder. This lets your old tank act as a frame, while the bladder keeps the water clean and prevents leaks.
Regular Maintenance:
We don’t just fix your tank once; we offer ongoing maintenance to keep your tank in good condition, catching small problems before they become big ones.
Our Process: How We Repair Concrete Tanks
We’ve designed our repair process for minimal disruption, long-lasting results, and maximum safety.
1. Inspection & Assessment
2. Drain & Clean
3. Repair & Reseal
4. Test & Restore
Residential, Agricultural & Commercial Tank Repairs
No matter where your tank is or what it’s used for, Transform Water has the solution:
- Homes – Concrete rainwater tanks, irrigation tanks, retention systems
- Farms – Large rural tanks, animal troughs, irrigation tanks
- Commercial – Stormwater detention tanks, fire service tanks
- Government & Infrastructure – Council-owned tanks, catchment systems
No Need to Empty the Tank? Yes, It’s Possible
One of the best things about our tank liner installation service is that you don’t have to empty your tank. That means:
- No water wastage
- Faster installation time
- Lower costs – no need to transport or store water
- Keep your tank in use during the process
This makes it perfect for homes, farms, and businesses that rely on their tank every day.
Are Concrete Tanks Still Worth Repairing?
Yes — if you already have one.
Concrete tanks are still structurally solid if maintained well. With proper repairs (like modern coatings or tank liners), they can continue to serve you for decades more.
At Transform Water, we specialise in repairing and restoring these ageing tanks — giving them a new lease on life with modern waterproofing and reinforcement methods.
Why Choose Transform Water?
Here’s why we’re the right choice for your concrete tank repair needs:
- Expertise and Experience: Our team has years of experience and knows both old and new repair methods inside out.
- Customised Solutions: We understand that every tank is different. We tailor our services to meet the specific needs of your tank.
- Quality and Trust: We use the best materials and latest methods to make sure our repairs last, giving you better value and peace of mind.
- Eco-Friendly: We focus on fixing existing tanks to help reduce the need for new materials and cut down on waste.
Ready to Get Started?
If you’re having problems with your concrete water tank, don’t wait until they get worse. Contact Transform Water today to set up a consultation.
We’ll take a look at your tank, come up with a clear plan, and get to work on the repairs. Make sure your water storage is in expert hands with our technicians, where we turn repair challenges into long-lasting successes for your water supply independence
