Large Water Tanks

Pioneer Water Tanks - Large Rainwater Tanks Sizes

Large Water Storage Solutions

For more than 30 years, Pioneer have been installing the biggest tanks across rural Western Australia where there are thousands of farmers, families, businesses and cattle stations who require large amounts of water storage in capacities that poly tanks simply aren’t available in.

Whether this is rainwater collection for drinking water, multiple tanks with a water pump to feed livestock or cattle, a large steel tank for irrigation purposes or even a home with a water tank size large enough for bushfire protection, these people aren’t going to be able to rely on a small poly tank or slimline water tank.

For these people, typically with no access to mains water, large rainwater tanks are vital to their needs and way of life. Pioneer Water Tanks offers large water tanks with sizes from 12,000 litres to 500,000 litres – and even larger for commercial tanks.

The size means little if the tanks aren’t up to Australian Standards, however, and this is why Pioneer uses only high quality materials, and maintains tight levels of control over all levels of production to ensure that your water tank lasts you and your family for many years to come.


Pioneer Water Tanks have provided a service for Western Australia since 1988. Our high quality Australian-made water tanks will provide the long-term water security you’re looking for.

What is the biggest tank I would need?

Choosing what size of water tank is best for you is an important decision – the last thing you want to do is run out of rainwater before the end of summer, but you also don’t want to be paying for extra capacity that you are unable to fill. There are many factors to consider when choosing between water tank sizes, including the climate in your area, the number of people using the water, and the size of your rainwater harvesting catchment areas.

The climate in your area is mostly going to have to do with how much annual rainfall you receive, but people also tend to drink more in the warm weather and have longer showers in the cool weather, and these are both factors that must be considered.

The number of people living in the home is also a key determinant factor and Pioneer Water Tanks has a rough guide for the best size water tank for your family size:

  • 2 Persons: 90 000L
  • 3 Persons: 110 000L
  • 4 Persons: 150 000L
  • 6 Persons: 250 000L

These figures are simply recommendations, and everyone’s water usage is different, and you should monitor your water usage to ensure you get a water tank large enough for your home. It will also vary if you intend to use your water tank to water any gardens, lawns or animals, or if you choose to have additional storage for fire protection.

How much rainwater can my large water tank capture from my roof?

When it comes to how much water your can harvest, you need to know the size of your catchment area (all guttered roofs, including sheds and garages) and your property’s annual rainfall. You can check your area’s annual rainfall as a guide, however your own microclimate may be different and this will effect your harvesting ability.

The equation to determine your annual rainfall is as follows:

Roof Size ( ) x Annual Rainfall (mm) = Rainwater Harvesting Ability

300  x 850mm = 255 000L

For more information, head to our Water Tank Sizes page.

If you cannot capture enough rainwater off of your roof, you can purchase the Pioneer exclusive Smart Water Savers as an optional accessory to boost your water storage by using your tank roof as part of your rainwater harvesting area.

Choosing the right location for your size of tank

The location of your water tank is also crucial. For people on farms or stations, you want to position your water tanks where it is most convenient to use for the applications you have installed the water tank for. This could be near water troughs with a float valve, where you pump groundwater from a bore or dam to the tank, or close to a crop or shed, where you can use it for irrigation purposes.

When it comes to rainwater tanks for your home, there are some specifications that need to be met to ensure that your water tank fills correctly. There are two methods of plumbing in your water tank for rainwater collection, wet harvesting and dry harvesting. A dry harvesting system connects an underground series of pipes to the downpipes on your gutters to one pipe running into your tank roof, where the dry harvesting system runs straight from the downpipe and into the water tank.

For both of these methods, the tank is required to be located 50mm lower than the gutter for every 1000mm from the home or shed that it is located. You also don’t want the tank too low, or too far away, so that the tank is still able to gravity feed water back to your home without the need for any pumps along the line. You will also require minimum 1m clearance on all sides of your water tank for ease of installation.

You also need to ensure that you not only have a water tank large enough for your family’s needs, but that you have enough room to fit a big water tank on your property. Your Pioneer Water Tank requires 1m clearance on each side of the tank to ensure access to the tank.

How to install a large rainwater tank

In order to comply with warranty, and to ensure that your water tank lasts as long as possible, all Pioneer Water Tanks must be built by an authorised Pioneer Water Tanks Dealer, who will be your point of contact from quote, to order, to post sale service. These expert tank builders construct exclusively Pioneer Water Tanks and the team that attends your site will be local to your area, bringing with them not just experience of building water tanks, but building Pioneer Water Tanks in locations just like yours.

Prior to installation of your water tanks, a stable tank pad foundation must be prepared. This sand pad must be level, stable and free of debris, and made of inert sand 150mm thick, with a diameter of 1m wider than the tank base.

You also should have prepared on site enough aggregate to place 500mm around the circumference of that tank, and a small water supply to partially fill the tank. This can be water in an existing tank, or from a water carting service. For more on water tank installation, check our guide here.

Who needs large rainwater tanks?

Rural homes and semi rural homes who don’t have access to mains water supply rely on water storage tanks and rain harvesting in order to maintain access to reliable drinking water. This tank water is typically harvested straight from the roof, however some homes will have multiple tanks, one of potable water harvested from the roof, and one with water from a bore or dam for showering, running the washing machine and flushing the toilet.

As these homes rely on their tank water as a matter of life or death, it is crucial that they have durable, high quality water tanks that keep their water fresh, clean and healthy year round. Pioneer Water Tanks come with the Pioneer exclusive Aqualiner Fresh® antimicrobial tank liner, and the patented Pioneer V-Lock® wall panel in order to best protect your water, and your family’s livelihood.

two pioneer water tanks side by side on a rural block at the base of a mountain for off grid sustainable water storage

The agricultural industry requires consistent water storage, often with fast delivery, and can’t rely on pumps and windmills to get them water from a well, bore or dam on demand. The dry outback of Western Australia also means that a lot of the water stored in dams, or sourced from creeks or rivers runs dry in the summer months due to evaporation and lack of rain.

This is why water storage is so crucial for farmers, and large tanks are found on all sorts of farms across the state, including use by growers, piggeries, dairy farmers and more. The design of Pioneer’s large steel water tanks makes it easy to install even on large blocks where it is a long distance from the road or home, and their durability means it is standard for these tanks to last well over thirty years.

a pioneer water tanks GT200 200000 litre water tank zincalume water tank built next to a farmstead home in gidgegannup western Australia for water tank irrigation and growing

Pioneer Water Tanks have a longstanding relationship with many cattle stations across Australia, and you will often see the now iconic Pioneer Pub at Cattlemen’s events, where businesses and station managers alike can meet, mingle and network.

These sprawling stations in the driest parts of the country often require multiple water tanks, in some of the largest water tank sizes that Pioneer Water Tanks offers. When people think of rural water storage, a Zincalume ® water tank against the backdrop of red dust and brown grass is often what comes to mind.

Steel water tanks have long since overtaken concrete water tanks, as not only is a large steel tank easier to install than a concrete tank, it is also significantly easier to maintain and repair.

a southern cross windmill in front of a large zincalume steel water tank from pioneer water tanks in a red dirt rural location next to an old ruined squatter tank

Range of sizes, colours and accessories

Big Water Tanks for Long Summers

As Australia’s #1 big tank company, Pioneer Water Tanks offers a wide range of water tank sizes for rainwater storage, from the 12,000L GT10 to the whopping 500,000L GTi501. These tanks are all made from Australian sourced BlueScope Steel, and are available in a traditional Zincalume ® finish, or in one of Pioneer Water Tanks available range of standard and non-standard Colorbond ® colours.

Not only are Pioneer rainwater tanks available in such a wide range, there are also 16 models in the standard GT rural range, from the GT10 to the GT280, and a further 18 models in the industrial range from the GTi18 to the GTi501, meaning there is sure to be a water tank in a size that meets your needs. These water tank sizes can be found here.

Big Water Tank Colours Range

Pioneer Water Tanks believes that your water tank should be a feature of hour house or farm, and not an eyesore. This is why all Pioneer Water Tanks products are available in a variety of Colorbond ® colours, as well as the classic Zincalume ® finish that has become an icon of the Australian outback.

The price will vary based on the colour of water tank you choose, however likely not by enough that you’d be inclined to change your mind about a colour you were already set on. An advantage of using genuine Colorbond ® and Zincalume ® steel is that if your house or shed is made from a particular colour, there is a good chance you will be able to purchase a water tank that matches it.

Standard Colorbond® Water Tank Colour Range



Classic Cream™

Woodland Grey®




Pale Eucalypt®

Non-Standard Colorbond® Water Tank Colour Range

Dover White™

Evening Haze®



Shale Grey™





Night Sky®


Deep Ocean­®

Cottage Green®

Manor Red®

Standard Colorbond® Colours

Non-Standard Colorbond® Colours

Water Tank Accessories

Pioneer Water Tanks are also come with a host of water tank fittings and accessories that are included in the price of your water tank, as well as a range of optional water tank accessories that you may choose to add on to your water storage, that each come with their own benefits.

Included Accessories

  • Aqualiner Fresh®* antimicrobial water tank liner
  • Set (2) of sacrificial anodes
  • 1 x 50mm outlet & ball valve
  • 1 x 150mm Overflow, Downpipe with Frogflap
  • 1 x stainless steel leaf filter basket
  • 1 x lockable heavy duty hinged access hatch
  • 1 x galvanised hook-on ladder
  •  Pioneer’s 20/20 Warranty**

Optional Accessories

  • SuperSeal dustproofing condensation strip
  • Smart Water Saver smart gutter system
  • Digital and analogue tank level indicators
  • Tank Mate 4G smart tank monitor
  • Fire brigade connections (check with your shire for size and type required)
  • Optional 20,000L or 10,000L fire reserve

* Aqualiner Fresh® available on models GT10 – GTi368. Models GTi 410 – GTi501 include Industratex® liner.

** Tanks from GTi 291 – GTi 501 include a 10 year conditional warranty.

You can learn more about the range of water tank accessories offered by Pioneer Water Tanks here. 

Manufactured right here in Western Australia

Pioneer have been a leading manufacturer of large rainwater tanks in Western Australia for more than thirty years, and have thousands of satisfied customers all across Australia. All of our tanks are built right here in Western Australia, in our Bellevue office, before being rolled out to our team of installers across the country.

If you’re looking for a quote on a large water tank for your home or farm, give us a call today on 1800 999 599, or simply click here to request a quote for quality water storage, and one of our dealers will be in touch soon with your customised water tank pricing.

Frequently Asked Questions

What is the largest water tank you can buy?

The largest tank Pioneer Water Tanks offer as part of our standard range is the GTi501, with an impressive 500,000 litres – or 110,000 gallons – of water storage. However for commercial water tanks for industrial areas or mine sites, much larger water tanks can be engineered to specific dimensions and standards.

Which water tank is best for a home?

For a home with no access to mains water supply, there is no better water tank than a steel liner tank. Pioneer Water Tanks offers a range of steel liner tanks from 12kL to 500kL, made from genuine BlueScope steel, all across Australia.

How long do water tanks last?

All Pioneer Water Tanks in the GT range (12kL – 280kL) come with a 20 year conditional warranty, and all tanks in the GTi range (290kL – 500kL) come with a 10 year conditional warranty. However, this is simply to give you peace of mind. Many Pioneer Water Tanks last well over thirty years, and most of the water tanks installed in Pioneer’s first year of business back in 1988 remain in operation today.

How are large water tanks constructed?

Large water tanks for the home or farm are constructed by experience water tank installers and put together on-site, thanks to their innovative bolt-together design and durable liner making them incredible transportable. Commercial and industrial tanks are often put together with the help of hydraulic jacking systems to prevent working from heights, and to speed up installation time.

What can I use as a water source?

Pioneer Water Tanks can be used to store water from a variety of sources, including rainwater, dams and bores. However, if you are to use water from a non-rainwater source, it is recommended that you test the water to ensure that it is compatible with the Aqualiner Fresh® water tank liner. If you are using your water tank for potable or drinking water, ensure you are only using rainwater as a water source.