Rainwater Tanks for Sale | Poly Tanks

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Premium Rainwater Tanks for Every Need.

Polymaster offers an extensive range of poly rainwater tanks for sale, in a wide range of sizes, including large and underground tanks, all crafted from premium food-grade polyethylene. We take pride in being certified to AS/NZS4020, the Australian standard for drinking water, and maintaining ISO9001 quality management certification.

Small Water Tanks

View range Small Water Tanks

Round Water Tanks

Ranges from 200ltr up to 50KL. Smooth wall or corrugated finish. Up to 20-year warranty.

View range Round Water Tanks

Slimline Water Tanks & Pumps

Ranges from 600ltr to 5,000lltr. Builders tank and pump packages available. Up to 10-year warranty.

View range Slimline Water Tanks & Pumps

Underground Water Tanks

Available in 3300ltr and 5,000ltr options. Garden pump/household pump packages. 10-year warranty.

View range Underground Water Tanks

Retention and Detention Tanks

Meet council requirements with a retention and detention tanks.

View range Retention and Detention Tanks

Pipeline Tanks

These tanks are designed to be connected to pipelines for stock and domestic water supply.

View range Pipeline Tanks

Pumps & Water Tank Accessories

To compliment your water tank, we have water pumps, inspection covers, filters, and other accessories.

View range Pumps & Water Tank Accessories

Find the right water tank for you

Featured Products

Rainwater Round Tank 50,000L

RWT50KL

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Rainwater Round Tank 31,700L

RWT31700

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Rainwater Round Tank 22,500ltr round rainwater tanks for reliable home water storage

22,500L Rainwater Round Tank

RWT22500

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Rainwater Round Tank 13,600L

RWT13600

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Rainwater Round Tank 9,000L

RWT9000

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Rainwater Round Tank 7,100L

RWT7100

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5000L Water Tank – Round

RWT5000

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Rainwater Round Tank 4,500L Tall

RWT4500T

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Rainwater Round Tank 4,500L Low Profile

RWT4500LP

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Rainwater Round Tank 3,300L

RWT3300

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Rainwater Round Tank 2,270LTall

RWT2270T

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Rainwater Round Tank 2,270ltr Low Profile

RWT2270LP

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Rainwater Round Tank 1,600L

RWT1600

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1,000L Water Tank – Round Rainwater Tank

RWT1000

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600L Round Rainwater Tank

RWT600

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200L Rainwater Round Tank - Small Water Tank Range

200L Round Rainwater Tank

RWT200

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underground stormwater retention - detention tanks

Rainwater Retention Detention Tank

RWTRET

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2,000L Slimline Water Tank

PCST2000

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3,000L Slimline Water Tank

PCST3000

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At Polymaster, our commitment goes beyond manufacturing. We provide exceptional pre-sales and post-sales support, ensuring you make an informed decision and receive ongoing assistance. As Australia’s leading rainwater tank manufacturer, we stand by the durability and quality of our products, offering up to a 20-year warranty on every poly water storage tank.

When you choose Polymaster, you’re choosing more than a tank; you’re choosing a partner in sustainable water solutions. Our rainwater tanks are not just built to last; they are designed to thrive in the industries we serve, with a remarkable 25-year design life. Trust us for excellence in water storage, because every drop matters. Discover why engineers, farmers, and homeowners alike trust our poly rainwater tanks to safeguard every drop.

Poly Water Tanks for Homes, Farms, and Industry

We understand how our tanks will be used. Our team is familiar with your industry, its processes, and how our tanks fit into those processes. Because of this, our tanks are built to last and come with a 25-year design life. From rainwater harvesting in Melbourne backyards to large-scale water storage tanks on Queensland farms, Polymaster delivers fit-for-purpose solutions. Large Tanks to Small Water Tanks at Polymaster...We've got you covered!

View all Industries

Agriculture/Farming

Water Utilities

Chemical Suppliers

Local Government/Municipalities

Wastewater / Water Treatment

Water Treatment/Wastewater

Engineers / Specifiers

Engineers/Specifiers

Food & Beverage

Clean In Place

Commercial Pools

Transport

Civil Contracting

Civing Contracting

Mining

Concrete Admixtures

Manufacturing

Food Grade

Food-grade polyethylene, certified to AS/NZS4020, the Australian standard for drinking water

Quality Assurance

Polymaster is certified for the international standard for quality management ISO9001

Product Certification

Standard AS/NZS 4766:2006 for peace of mind. Licence no. BMP657671 & BMP650824

Pump & Poly Tank Accessories

Get the most from your rainwater tank with our range of pump and tank accessories.

Leaf Guard – Swivel Outlet

Special Features: Fits under gutter to prevent leaves

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Level Indicator – Dipstick

360° all-round visibility This floating pole type water

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Hyjet Pump – 370W with Brass Change Over Device

The MHR20 Series is a fully Automatic Hydraulic

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I am proud to supply this feedback as it has been a long time since I was treated so amazingly well as a customer until I dealt with Polymaster. A) received excellent Pre Sales & Service from your dealer, Martha at Electel. B) Then 10 days before delivery I received a positive call from a polite young lady who ran through the complete scope of the order. To say I was appreciative was an understatement. Wished more companies had your service commitment / DNA. C) Then a day before delivery I received a polite phone call from a truck driver who introduced himself as your driver and ran through the logistics / offloading etc. Said he couldn’t give me an exact time but would ring me in morning to advise exact ETA. I have never met a truck driver who was so organised. All of the above culminated in to me being blown away with Polymaster’s outstanding customer service. Thank you very much and please pass my feedback onto your Mgr Director. It was a pleasure to deal with a company who is so transparent and organised, congrats.

G.C

Callignee, VIC

From entering details online and then talking with Tony Columbro to ensure I had details correct to then the text messages when the tank was ready. Then notified it was loaded and on its way to its new home. The whole process was professional and super smooth. Love the tank.

H.M

Nyah, VIC

Once tank was ordered it was confirmed and outlets checked . Delivery day was advised and driver was excellent . Great company to deal with.

D.P

Hepburn Springs, VIC

Good communication from Polymaster and delivered without a problem. Very happy with the quality of Polymaster products too.

Anonymous

Thanks to the driver, Bruce for delivery to a spot made difficult by recent rain. Managed to get tanks to their right spots. Good effort!

Anonymous

Sales people were excellent in providing updates to delivery and delivery driver also keep me informed of delivery times and helpful with information regarding the tank.

A.G

Great customer service especially Rachel. Also the driver was extremely helpful and professional in his handling of his job. Tank arrived on time as promised. The only little thing is that the tank was not put on position but close for us to push it the the foundation. Definitely we will order our next tank from them. Just recommended my friend to buy from Polymaster.

Anonymous

Good price. Great communication. On time friendly delivery service. Brilliant. Oh and the product is second to none.

G.O

Very happy with the product, also very happy with all the text messages telling me how the production was going. Will definitely be buying another tank from you in the future.

K.S

Besides the delivery arriving a day early the entire experience was excellent. Tim was excellent and did everything possible to help out to make sure the tanks were put in the best place. Thanks very much."

A.J

Loch, VIC

Ecstatic with delivery made by Mark Sinclair today - haven't had good old service like this in a very long time. Mark was polite, helpful & an absolute bloody gem. Highly recommend Polymaster to everyone.

C.C

Scarsdale, VIC

Easy to deal with. Prompt delivery. Courteous and friendly delivery driver. Great experience."

B.E

Table Top, NSW

My experience was excellent. I don't know how it could be better. Everything worked exactly as I hoped.

I.S

Second Valley, SA

The customer service was fantastic with a step by step walk through on the setup of the tanks. The recommendations on how to get the best set up of the tank fittings pump positioning. To the delivery of the tanks and the positioning on the ground.

Ben

"From start to finish it was nothing but a great experience. Very professional. Great company with great staff."

Anonymous

Over the moon with the quality of the tanks and the service ????

S.O

Burra North, SA

Both truck drivers are excellent. Very helpful. All tanks are wonderful. Very quick delivery after placing order. Had phone calls from Polymaster to check tank details and progress of delivery.

Neil Winter

Murgheboluc, VIC

"Great customer service from office, keeping me up to date with delivery time etc. Delivery man mark was on time, knowledgeable and did a fab job getting in a tight driveway. Very happy with my tank thank you."

Kerry Marsh

Ocean Grove, VIC

First class service. First class product.

Anonymous

We’ve found working with Polymaster to be a positive experience. The quality of the products which we have used has been very high, and the willingness and technical capacity of the staff to tackle non-routine engineering modifications has given us confidence in the finished build.

P. Baker

Land Energy Pty Ltd

The decision to sell Polymaster tanks to my customers is an easy one due to the fact that I strongly believe they are the best quality tanks on the market and I can confidently stand by the product I am supplying.

David Hartwig

Plumbing Contractor

We are very pleased with the choice we made to go with Polymaster due to the quality and excellent service. We will endeavour to use more Polymaster tanks as we continue to upgrade our property.

Matthew

Bridgewater SA

Find Your Local Distributor Store

Polymaster’s round rainwater tanks are available across Victoria, South Australia, New South Wales, and South-East Queensland. As leading Australian storage tank manufacturers, we offer round poly tanks in various sizes to suit rural, residential, and industrial applications. No matter your location, we have a round water storage tank solution to suit your needs and budget.

How do I know when my Rainwater Tank will be delivered?

Delivery Process FAQ Our logistics department will be in contact with you 7 days prior to delivery to:

Confirm your delivery address
Advise you of the access guidelines for delivery to your property
Confirm if you will be onsite when the delivery arrives

In addition to this, we will require a flat area of 5 metres by 5 metres at your property to safely unload the tank. Please ensure this area is clear and accessible upon delivery. This is essential to avoid any delays or complications during the unloading process. We can also offer a courtesy call prior to your delivery if required.

What fittings will my tank come with?

All Polymaster tanks have standard fittings when purchased. These fittings vary slightly according to our different tank ranges. Our Premium Rainwater tanks come standard with:

Inlet with leaf screen/strainer
1 x 90mm overflow
1 x threaded outlet
1 x ball valve

Our slimline tanks come standard with:

Inlet and leaf screen/strainer
1 x 90mm overflow
1 x threaded outlet

The outlets and ball valves also can vary in size depending on the size of the tank:

200ltr – 5,000ltr tanks = 1” (25mm) outlet & ball valve
7,100ltr – 50,000ltr tanks = 1 ½” (40mm) outlet & ball vale

The threaded outlet will always be fitted to the tank. The ball valve is supplied loose, unless specified otherwise. Other fittings are available upon request.

What is the cost to deliver my tank to site?

Polymaster offers free 'delivery to site' in all Victoria.
Polymaster offers free 'delivery to site' to parts of South Australia, New South Wales and Queensland for tanks over 13,000ltr – 50,000ltr tanks (remote areas excluded).
For tanks smaller than 13,000L, there is a $165 exc GST charge to 'deliver to site'.
For all rainwater tanks, delivery is free to the closest Polymaster 'distributor store' within these areas.
The areas covered in South Australia and New South Wales are the southern parts - covering from about Corryong on the Victorian/NSW border up to Yass, across to Hillston and up to Broken Hill, then down to Mildura. From Broken Hill, across the SA border to Orroroo, then down to Port Pirie. Anything underneath this in South Australia we cover.
The areas covered in Southern Queensland and Northern New South Wales, approximately 450km radius from Ipswich forming a border with the following towns, Bundaberg, Theodore, Roma and St George.
For deliveries to areas 'outside' of; Victoria, Southern South Australia, Southern NSW, and approximately 450km radius from Ipswich QLD, freight is additional.
Contact us for your freight quote.

Where do you deliver?

Where do we deliver?

1.Ag & Plumbing Products

Zone 1 – Free Delivery* Polymaster’s extensive distribution network includes Victoria, Southern NSW, South Australia, South-East Queensland, and North-East NSW. We provide convenient delivery options directly to your location or to the store where you purchased your product. Zone 2 – Delivery Charges Apply Please contact us for delivery options and charges applicable to locations outside our Zone 1 areas. Our team is ready to assist you with tailored delivery solutions to meet your needs. *Zone 1 Special Conditions: Delivery is free for tanks exceeding 13,000 litres. Most smaller items have free delivery to your local Polymaster Distributor, ensuring easy access and quick availability.

2.Chemical Tanks & Engineered Solutions

All Chemical Tanks and Engineered Solutions have freight costs calculated on a per project basis.

What type of base does my tank need to sit on?

The foundation that your tank sits on is critical to ensure that it is supported adequately without the risk of causing fatigue to the tank and potential failure. To correctly install your rainwater tank, it must be placed on a firm, level and flat base, free from any rocks, stones and sharp edges. A concrete pad is recommended, however, a compacted sand base or other consolidated fill such as crusher dust is also suitable. The base must be thoroughly compacted and be exactly level and flat in all directions and should be 75-100mm deep and at least 600mm larger in diameter than the tank base. The outsides of the base must be supported by a retaining wall of some kind to ensure that no erosion can occur through washout, vermin or any other factor. Failure to provide a stable base will void the warranty. It is important to check the base on an annual basis to ensure it hasn’t eroded, as this may affect the structure of the tanks. If the foundation is not concrete, it’s ideal to have a roof structure over the tank for drainage - Consult the Installation and Operation Manual of the manufacturer for more details. If you have a chemical tank the slab needs to be engineered to support the weight of the tank without flexing or breaking.

Where can I position my tank fittings?

Each style and tank size have different available fitting positions. Therefore, refer to table below to find the fitting positions for your preferred tank. Premium Round Tanks Polychoice Round Tanks Slendastyle Tanks Polychoice Slendastyle Tanks

What property access is required for delivery?

Important Delivery Information for Your Tank Due to the size of our tanks, our truckloads can be quite large and long. We take the safety of delivering your tank very seriously, which is why we've established clear guidelines to ensure a smooth and safe delivery.

The clearance required for the truck and trailer is 19 metres long, 5 metres high, and 3.5 metres wide.
Please ensure there are no low-hanging branches or powerlines in the delivery area.
Make sure the gate or entrance is wide enough, and there is sufficient turning space for the 19-metre-long truck and trailer (about the size of a standard roundabout).
We require a 5 metre by 5 metre flat area to safely unload the tank.

Are rainwater tanks worth it?

Absolutely. Investing in a Polymaster poly water tank turns every downpour into free, reliable water for gardens, laundry, toilets, and even stock. Our UV-stabilised, food-grade polyethylene tanks outlast harsh Australian conditions, cut your mains-water bill, and future-proof your property against water restrictions. With a 20-year warranty and nationwide delivery, the pay-back is measured in both savings and peace of mind.

How often should rainwater tanks be cleaned?

Routine water tank care is simple: clear gutters, leaf screens, and first-flush diverters every six months to stop debris from entering the tank. Inspect the internal base every two to three years; if you spot a layer of sludge, pump out and hose down the floor, then disinfect if the tank supplies drinking water. Sticking to this cycle keeps stored water fresh and preserves the long-term integrity of your poly water tank.

What is the difference between a rainwater tank and a stormwater tank?

A rainwater (retention) tank captures roof runoff for ongoing use; ideal for irrigation, household appliances, and firefighting reserves. A stormwater (detention) tank only holds peak flows after heavy rain, then releases them slowly through an orifice to protect council drains; no long-term storage is intended. Many builders now specify combination retention/detention systems, and Polymaster supplies certified solutions for both requirements.

Should you drain your water tank every year?

No. Fully emptying a tank annually wastes precious water and isn’t necessary for maintenance. Instead, follow the 2–3-year sediment check outlined in our helpful blog on water tank cleaning. Drain only when a clean-out is due, fittings are being upgraded or local council health rules demand it. Well-maintained polyethylene water tanks stay clean without frequent emptying.

What size rainwater tank do I need for my garden?

Start with these easy rules of thumb, then fine-tune using your local rainfall and roof catchment:

Courtyard pots and herbs – a slimline tank around 1,000 L keeps small planters thriving.
Compact veggie patch (up to 50 m²) – step up to a 2,000–3,000 L round or slimline tank for reliable irrigation.
Family lawn and mixed beds (100 m² or more) – look at a 5,000 L (or larger) round tank to cover regular watering.

For a precise figure on what size rainwater tank you need, multiply your available roof area (in m²) by your postcode’s average annual rainfall (in mm), then divide by how many times you expect to empty and refill the tank each year. Need help crunching the numbers? Use Polymaster’s online water tank calculator - or call our team - and we’ll size the perfect rainwater tank for your garden and climate.

Get in touch

Call Polymaster today on 1800 062 064

Contact our team Find your local store

Durable Rainwater Tanks, Built to last.

Premium Rainwater Tanks for Every Need.

Small Water Tanks

Round Water Tanks

Slimline Water Tanks & Pumps

Underground Water Tanks

Retention and Detention Tanks

Pipeline Tanks

Pumps & Water Tank Accessories

Featured Products

Poly Water Tanks for Homes, Farms, and Industry

Agriculture/Farming

Water Utilities

Chemical Suppliers

Local Government/Municipalities

Wastewater / Water Treatment

Engineers / Specifiers

Food & Beverage

Clean In Place

Commercial Pools

Transport

Civil Contracting

Mining

Concrete Admixtures

Manufacturing

Highest Quality & Standards

Food Grade

Quality Assurance

Product Certification

Pump & Poly Tank Accessories

Leaf Guard – Swivel Outlet

Level Indicator – Dipstick

Hyjet Pump – 370W with Brass Change Over Device

Find Your Local Distributor Store

Water Tank FAQ’s

How do I know when my Rainwater Tank will be delivered?

What fittings will my tank come with?

What is the cost to deliver my tank to site?

Where do you deliver?

Where do we deliver?

1.Ag & Plumbing Products

2.Chemical Tanks & Engineered Solutions

What type of base does my tank need to sit on?

Where can I position my tank fittings?

What property access is required for delivery?

Are rainwater tanks worth it?

How often should rainwater tanks be cleaned?

What is the difference between a rainwater tank and a stormwater tank?

Should you drain your water tank every year?

What size rainwater tank do I need for my garden?

Linfox Property Group

Brookeshill Orchards

Waikerie Golf & Country Club

Unilever

Swan Hill Truck Specialists

Santos Jet Lift

Get in touch

Durable Rainwater Tanks,
Built to last.