When you’re investing in a water storage system, capacity is only one part of the equation. If the stored water is intended for drinking, cooking, food preparation, or any other household use, water quality becomes the priority. This is exactly why Australian standards matter.
Whether you’re a homeowner, farmer, commercial property owner, developer, or business manager, understanding potable water steel tanks and the significance of AS/NZS 4020 helps you make a smarter investment that protects both your health and your property.
At Armstrong Tanks, we believe customers deserve more than just a durable tank. They deserve confidence that every drop stored inside remains safe for everyday use.
This guide explains what AS/NZS 4020 is, why it matters, and how choosing compliant tanks protects your water supply for years to come.
What Is Potable Water?
Potable water refers to water that is safe for human consumption. It can be used for:
- Drinking
- Cooking
- Preparing food
- Washing fruits and vegetables
- Personal hygiene
- Ice making
Unlike water stored solely for irrigation or industrial purposes, potable water must remain free from harmful contaminants that could affect human health.
This makes the construction materials of your storage tank extremely important.
What Are Potable Water Steel Tanks?
Potable water steel tanks are specially designed storage tanks manufactured using materials and internal coatings that are safe for storing drinking water.
Unlike ordinary storage tanks, these tanks prevent harmful chemicals from leaching into the water over time.
High-quality drinking water steel tanks are engineered to maintain water quality while offering excellent structural strength, long service life, and resistance to Australia’s harsh climate.
They are widely used for:
- Residential homes
- Rural properties
- Schools
- Hospitals
- Food processing facilities
- Commercial buildings
- Mining accommodation
- Community water projects
- Agricultural operations
Understanding AS/NZS 4020
AS/NZS 4020 is one of Australia’s most important standards relating to products that come into contact with drinking water.
The standard evaluates whether materials used inside tanks, pipes, fittings, coatings, seals, liners, and other water infrastructure affect water quality.
In simple terms, it answers one important question:
Will this product change the safety, taste, smell, or quality of drinking water?
Products that comply with AS/NZS 4020 undergo extensive laboratory testing before being considered suitable for potable water applications.
Why AS/NZS 4020 Matters
Many people assume all water tanks are suitable for drinking water.
That is not always true.
If a tank contains unsuitable coatings, sealants, or internal components, harmful substances may gradually enter the stored water.
This creates unnecessary health risks.
AS/NZS 4020 certification provides assurance that materials have been tested for:
- Taste and odour
- Appearance of water
- Growth of microorganisms
- Release of toxic substances
- Impact on overall water quality
Choosing compliant potable water storage tanks significantly reduces these risks.
How AS/NZS 4020 Protects Your Drinking Water
Prevents Chemical Contamination
Some materials slowly release chemicals into stored water.
Certified tank components are tested to ensure they do not contaminate drinking water.
This provides long-term confidence for homeowners and businesses alike.
Maintains Water Taste
Nobody wants drinking water that tastes metallic, plastic-like, or unpleasant.
Certified materials preserve the natural taste of stored water.
Reduces Unpleasant Odours
Poor-quality coatings may produce unwanted smells inside stored water.
AS/NZS 4020 testing ensures these materials will not negatively affect water quality.
Supports Public Health
Safe drinking water plays an essential role in protecting families, employees, customers, and communities.
Certified potable water tanks contribute to healthier water systems.
Which Parts of a Steel Tank Must Meet AS/NZS 4020?
Many people believe only the steel itself requires certification.
In reality, every component that touches drinking water matters.
These include:
- Internal protective coatings
- Liners
- Sealants
- Gaskets
- Pipe connections
- Inlet fittings
- Outlet fittings
- Overflow components
Even one non-compliant component may compromise water quality.
This is why reputable manufacturers carefully select every material used inside their tanks.
Why Steel Is an Excellent Choice for Potable Water Storage
Steel continues to be one of Australia’s preferred materials for water storage because it offers exceptional durability without compromising hygiene when properly manufactured.
Outstanding Strength
Steel withstands:
- Heavy rainfall
- Strong winds
- Bushfire-prone environments
- Rural conditions
- Large storage capacities
Long Service Life
Well-manufactured drinking water steel tanks often provide decades of reliable performance with minimal maintenance.
Excellent Value
Although premium tanks may require a larger initial investment, they often reduce replacement and maintenance costs over their lifetime.
Sustainable Material
Steel is one of the world’s most recycled construction materials.
Choosing steel supports environmentally responsible water storage solutions while reducing waste.
Where Potable Water Steel Tanks Are Commonly Used
Certified tanks are suitable across many industries.
Residential Properties
Many Australian households rely on rainwater as their primary drinking supply.
A compliant tank helps maintain water quality from collection to consumption.
Farms and Rural Properties
Many farms depend entirely on rainwater harvesting.
Reliable potable water storage tanks ensure safe drinking water for families and workers.
Schools
Educational facilities require dependable water storage that meets strict safety expectations.
Healthcare Facilities
Hospitals and medical centres cannot afford compromised water quality.
Certified tanks support safe operations.
Food and Beverage Businesses
Food production relies heavily on clean water.
Using certified drinking water steel tanks helps businesses maintain hygiene standards.
Commercial Buildings
Large offices, shopping centres, hotels, and industrial facilities increasingly install commercial water tanks to improve water security while maintaining drinking water quality.
Common Misconceptions About Potable Water Tanks
“Any Steel Tank Is Fine”
Not necessarily.
Only tanks manufactured using approved materials and coatings should store drinking water.
“Rainwater Is Naturally Safe”
Rainwater can be very clean, but contamination may occur from roofs, gutters, birds, insects, or unsuitable storage tanks.
The storage system plays a major role in maintaining water quality.
“Certification Doesn’t Matter”
Certification matters because it provides independent verification rather than relying solely on manufacturer claims.
Choosing the Right Potable Water Steel Tank
Before purchasing, ask the following questions.
Is the tank suitable for drinking water?
Confirm the tank is specifically designed for potable applications.
Are internal coatings AS/NZS 4020 compliant?
The coating is often the most critical component.
Is the manufacturer experienced?
Look for manufacturers with proven expertise in Australian conditions.
Will the tank suit your property?
Consider:
- Water demand
- Available installation space
- Rainfall
- Future expansion
- Maintenance access
Is after-sales support available?
Reliable manufacturers continue supporting customers long after installation.
Maintaining Water Quality After Installation
Even the best tank requires sensible maintenance.
Good maintenance includes:
- Cleaning gutters regularly
- Installing quality leaf guards
- Using first-flush diverters
- Inspecting internal components
- Cleaning accumulated sediment
- Checking inlet screens
- Preventing mosquito entry
Simple maintenance protects both your investment and your drinking water.
Why Australians Trust Steel Water Storage
Australia experiences unpredictable rainfall, drought, and increasing pressure on municipal water supplies.
Reliable water storage has become an essential investment rather than an optional extra.
High-quality potable water steel tanks provide dependable storage while protecting water quality throughout every season.
Whether you’re building a new home, upgrading a rural property, or installing larger commercial water tanks, choosing products manufactured to recognised Australian standards offers peace of mind that lasts for decades.
Why Choose Armstrong Tanks?
At Armstrong Tanks, we understand that a water tank is more than a storage vessel. It is an investment in your family’s health, business continuity, and long-term water security.
Our commitment to quality ensures every solution is designed to perform in demanding Australian conditions while meeting the expectations of customers who refuse to compromise on safety.
When you choose Armstrong Tanks, you benefit from:
- Premium quality construction
- Reliable Australian manufacturing standards
- Durable designs built for harsh environments
- Expert guidance from experienced professionals
- Tailored water storage solutions for residential, rural, agricultural, and commercial projects
- Long-lasting performance with minimal maintenance
- Outstanding customer support from enquiry through installation
Whether you need a household tank or large commercial water tanks, our experienced team can help you select the ideal solution for your property.
Final Thoughts
Choosing the right water tank is about much more than storage capacity. When water is intended for human consumption, quality and safety should always come first.
Understanding AS/NZS 4020 helps property owners make informed decisions and avoid products that may compromise drinking water over time.
By investing in certified potable water steel tanks, you are protecting your family, employees, customers, and community while securing a dependable water supply for years to come.
At Armstrong Tanks, we are committed to delivering durable, high-quality storage systems that combine engineering excellence with trusted drinking water safety. If you’re planning your next water storage project, our team is ready to help you find a solution that is built to last and designed with Australian conditions in mind.
Frequently Asked Questions
1. What does AS/NZS 4020 mean for potable water steel tanks?
AS/NZS 4020 is an Australian and New Zealand standard that tests materials used in contact with drinking water to ensure they do not affect its safety, taste, odour, or quality.
2. Are all steel water tanks suitable for drinking water?
No. Only tanks manufactured with compliant materials, coatings, and components that meet drinking water requirements should be used for potable water storage.
3. Why are potable water steel tanks better for long-term water storage?
They offer excellent durability, corrosion resistance when properly coated, long service life, and help preserve water quality, making them ideal for residential, rural, and commercial applications.
4. Can potable water storage tanks be used for rainwater harvesting?
Yes. They are commonly used to store harvested rainwater intended for drinking and household use, provided the entire collection system is properly maintained.
5. How do I choose the right potable water tank?
Consider your required storage capacity, intended use, installation site, available space, compliance with AS/NZS 4020, build quality, and the reputation of the manufacturer before making your purchase.