Plastic Tank Repairs Sydney by Licensed Technicians
Sydney’s Plastic and Poly Tank Welding Specialists
Transform Water repairs plastic water tanks across Sydney and NSW. Our licensed technicians weld cracks and leaking fittings on site, so your tank stays where it is.
We repair polyethylene (poly) and polypropylene tanks of any size for homes, farms, businesses, and strata properties, whether it’s a slimline tank in Parramatta or a large rural tank in the Hawkesbury.
A repair usually costs far less than a new tank, and we only suggest replacing yours if welding can’t save it. After a leak, our water treatment and testing service can check that your water is still safe to use.
Why Do Plastic Tanks Need Repairs?
Most plastic water tanks are made from polyethylene (PE), and some from polypropylene (PP). Years of sun, shifting ground, and knocks from mowers or falling branches eventually crack the wall or loosen a fitting. Silicone, epoxy, and patch kits don’t bond well to either plastic, so they tend to lift after a hot summer. Plastic welding melts the matching material into the damaged area, which makes it the only permanent repair.
Common Plastic Tank Problems We Fix
Cracks and Splits
Breaks in the tank wall that leak slowly or all at once
Leaking Inlet and Outlet Fittings
Worn seals and cracked fittings where pipes meet the tank
UV Degradation
Chalky, brittle plastic from years in direct sun
Seam Separation
Joins pulling apart on moulded and modular tanks
Collapsed or Cracked Roofs
Damage from branches, foot traffic, or poor support
Broken Tap Connections
Snapped or leaking taps at the base of the tank
Impact Damage
Wall damage from vehicles, machinery, or falling debris
Overflow Pipe Problems
Cracked or dislodged overflows, letting water pool around the base
Our Plastic Tank Repair Services
We fix plastic tanks of every kind, and we match the repair to the damage. Our plastic tank repair services include:
- Crack and Split Welding: We weld cracks and splits with a filler rod matched to your tank’s plastic, so the seal is permanent and watertight.
- Fitting and Tap Repairs: We reseal or replace leaking inlets, outlets, and taps, and weld in new fittings where the old ones have cracked out of the wall.
- Seam and Wall Repairs: We weld and reinforce separated seams and impact damage so the wall can hold the weight of a full tank again.
- Roof Repairs: We repair cracked or collapsed tank roofs to keep leaves and mosquitoes out of your water.
- UV Damage Assessment: We check how far sun damage has spread and tell you honestly whether the plastic is still sound enough to weld.
- Overflow Pipe Repairs: We repair or refit cracked overflows so heavy rain drains away from the tank base instead of pooling around it.
- Filtration Upgrades: While we’re on site, we can fit or upgrade your rainwater tank filtration for cleaner water at the tap.
How Does a Plastic Tank Repair Work?
Every plastic tank repair we carry out follows the same five steps:
Inspect and assess
1
We find where the water is escaping, check the nearby plastic for hairline cracks, and quote you before we start.
Prepare the area
2
We lower the water below the damage and scrape the plastic back to clean material, because a weld won’t hold on dirty or oxidised plastic.
Weld the damage
3
Our technician fuses the crack shut with a filler rod that matches your tank’s plastic.
Test the seal
4
Once the weld cools, we refill past the repair and watch for any seepage.
Sign off
5
We show you the repair and explain what likely caused it, such as an uneven base or a pipe pulling on a fitting.
Emergency Plastic Tank Repairs Sydney
A split poly tank can lose most of its water in a matter of hours. If yours is draining fast, our team offers emergency plastic tank repairs across Greater Sydney and surrounding NSW, and we’ll talk you through how to slow the leak until we arrive.
Call us now: 1800 702 156
We Repair All Plastic Tank Types
- Round poly tanks: Rainwater tanks in every size.
- Slimline tanks: Narrow tanks along fences and side passages.
- Modular and corrugated poly tanks: Seam, join, and wall repairs.
- Underground polyethylene tanks: Repairs where the damaged section can be reached.
The brand on your tank doesn’t change whether it can be repaired. We work on Bushmans, Clark Tanks, Tank Master, Rapid Plas, and other major brands.
Specialised Services
Rural and Agricultural Tank Repairs
We repair large poly tanks on farms and acreage across the Hawkesbury, the Blue Mountains, and regional NSW, where losing a full tank can mean paying to cart water in.
Commercial and Industrial Tank Repairs
We weld and reseal plastic storage tanks on commercial and industrial sites across Sydney, and schedule the work to keep downtime low.
Strata Tank Repairs
We repair shared plastic rainwater tanks on strata properties and work with building managers to arrange access.
Why Choose Transform Water for Plastic Tank Repairs?
- Licensed and Insured: Licensed, insured technicians carry out every plastic tank repair we take on.
- Free, Honest Quotes: Your quote is free and based on what we find on the tank. If a repair isn’t worth the money, we’ll say so.
- Same-Week Bookings: Same-week appointments are available across Sydney and NSW, with emergency call-outs for fast leaks.
- Mobile, On-Site Repairs: We bring the welding gear and fix plastic tanks where they stand, so nothing has to be disconnected or moved.
- Complete Tank Services: We also clean and maintain water tanks, so one team can look after your whole system.
- Less Waste: Repairing a tank keeps a large piece of plastic out of the landfill.
Why Repair a Plastic Tank Instead of Replacing It?
A new poly tank can cost $2,000 to $5,000 or more before delivery, installation, and removal of the old one. A plastic tank repair usually comes in well under that. Your pump and pipework stay connected, and we finish most repairs on the day we arrive.
A good weld fuses into the tank wall instead of sitting on top of it, so there’s no patch to peel away later. Welding does have limits. A tank that has gone brittle all over from sun exposure, or one with a badly split base, is usually better replaced, and we’ll tell you if yours is one of them.
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Contact Our Sydney Team
We carry out plastic tank repairs across Greater Sydney, including the suburbs around the Sydney CBD, Western Sydney, Parramatta, Blacktown, Penrith, the Hills District, the Hawkesbury, and the Blue Mountains. Our technicians also travel to farms and commercial sites in regional NSW, so call us to check your area.
Call 1800 702 156 or request a free quote, and we’ll book a technician to inspect and weld your tank on site. Why replace it when we can weld it?
Frequently Asked Questions
Yes. Plastic welding permanently repairs most cracks and leaking fittings in plastic water tanks by fusing matching polyethylene or polypropylene into the damaged area. Silicone, glue, and patch kits don’t bond reliably to these plastics, so they only work as a short-term fix. A tank that has gone brittle from UV exposure, or has a badly split base may need replacing instead.
The price of a plastic tank repair depends on the size of the damage and where it sits on the tank. It is usually far cheaper than replacement, because a new poly tank can cost $2,000 to $5,000 or more before installation and removal of the old tank. Transform Water gives free quotes after inspecting the tank.
A typical plastic tank repair in Sydney takes a few hours and is finished on the same day. Roof repairs, structural wall damage, and tanks that need a lot of water drained can take longer. We give you a firm timeframe once we’ve inspected the tank.
Water tanks are made from either polyethylene (PE) or polypropylene (PP), and polyethylene is the more common of the two in Australian poly tanks. Both can be permanently repaired with plastic welding, as long as the welding rod is the same material as the tank. Our technicians confirm the plastic type during the inspection.
You usually don’t need to empty a plastic water tank completely before a repair. The water only has to sit below the damaged area so the plastic can be dried and welded. A crack near the base means draining more of the tank, and we’ll go through your options before any water is let out.
