The transition from a linear to a circular economy is a national priority for Australian industry and government. Plastic pipes are used across civil, industrial, agricultural and residential sectors, providing an example of how essential infrastructure products can align with circular economy principles through durability, repairability and recyclability.
Yet these systems are often overlooked in discussions about circularity because so few have reached the end of their service life. To better understand the sector’s performance, the Plastics Industry Pipe Association of Australia (PIPA), in partnership with Circular Australia and the Institute for Sustainable Futures at the University of Technology Sydney, conducted a study examining how plastic pipe systems fit within the circular economy.
The research assessed material flows, industry practices and stakeholder perspectives, and the findings were published in Plastic Pipes and the Circular Economy – An Australian Perspective in 2025. It showed that plastic pipes already embody many circular characteristics, even though limited end-of-life material currently enters recycling streams.
Plastic pipes are vital to Australia’s infrastructure, transporting water, gas and energy that underpin daily life and economic activity. Because they are buried underground and function reliably for decades, their contribution to circularity is often underestimated.
A pipe’s long lifespan, ability to be repaired or reused, and reduced environmental impact across its lifecycle are equally important. Evaluating these broader factors helps inform better policy and procurement decisions, ensuring that infrastructure is genuinely sustainable rather than merely recyclable.
Unlike short-life plastics, pipes are engineered to last for decades, often more than a century, so most remain in active use.
This durability explains the low availability of post-consumer recycled material and reinforces the need to consider circularity over extended timeframes. Reusing existing networks, repairing damaged sections and recovering installation off-cuts for recycling, all strengthen the sector’s circular performance.
Circular practices and stewardship
Australia’s plastic pipe industry has alignment with circular economy principles through established stewardship programs, national standards and company-led sustainability initiatives.
Key measures include the Industry Material Stewardship Program, which promotes responsible sourcing and recovery; the AS/NZS 5395 Best Environmental Practice standard for PVC pipes and fittings; and widespread adoption of ISO 9001 and 14001 management systems. In 2023, members reported using more than 6,000 tonnes of recycled material from pre- and post-consumer sources.
Industry-led initiatives such as the Construction Plastics Recycling Scheme and the Plumbing Industry Recycling Scheme are also generating valuable data on material recovery and helping design scalable end-of-life systems. A National Product Stewardship Scheme is under development to coordinate best practice nationally and align with broader circular economy goals.
Material flow and lifecycles
A high-level material flow analysis was undertaken to map how plastic pipe materials move through their lifecycle – from manufacture to end-of-life. The industry uses around 385,000 tonnes of virgin material annually. Because pipes have long lifespans, the majority remain in service, with minimal end-of-life recovery so far.
Most recycling currently focuses on off-cuts generated during installation rather than in-ground recovery, which is complicated by distributed networks and remote locations. Since large-scale pipe installation began in the 1960s and many products can last more than 100 years, the volume of end-of-life material is expected to remain low for decades.
Interviews with manufacturers, recyclers, installers, asset owners and industry bodies revealed high awareness of circular economy concepts, though many still equate circularity mainly with recycling. Higher-order strategies, such as reducing material use, designing for longevity and enabling reuse, were less frequently discussed despite their prominence in circular economy frameworks.
Manufacturers emphasised quality, fit-for-purpose design and compliance with standards. Recyclers cited logistical difficulties in collecting pipes from remote or buried sites. Installers pointed to the need for consistent materials and simple sorting systems. Despite these challenges, there is clear momentum. Pilot schemes, research partnerships and evolving standards are enabling progress. Stakeholders agreed that circularity must be recognised beyond recycled content, with procurement frameworks rewarding durability and resource efficiency across the entire lifecycle.
Barriers to greater circularity
The main limitation is the restricted supply of post-consumer material due to the longevity of existing systems. This durability is an advantage but makes short-term recycling metrics misleading. Other barriers include limited infrastructure for collecting end-of-life pipes, especially from dispersed or remote projects, and national waste data that fails to distinguish between long-life infrastructure plastics and short-life consumer products.
Addressing these issues requires better recovery logistics, refined standards and improved data collection to reflect the true circular value of long-life infrastructure materials. Realising the circular potential of plastic pipes will depend on coordinated action across government, industry and procurement.
Government policy should differentiate between short-life and long-life plastics, avoiding blanket recycled-content mandates that may not suit engineered products. It should support national stewardship schemes and co-invest in collection and recovery infrastructure. Accurate reporting that distinguishes infrastructure plastics from disposable products is also needed, along with a national database tracking in-use stock and end-of-life flows.
Read more: Plumbers lead the way with recycling scheme
Industry sectors including civil infrastructure, mining and agriculture should collaborate to improve logistics, embed lifecycle thinking into project planning and expand stewardship participation. Standards must evolve to incorporate recycled material safely and appropriately for different applications.
Procurement frameworks, particularly for publicly funded infrastructure, should move beyond recycled content as the sole measure of circularity. Whole-of-life performance, design efficiency and recovery at end-of-life should be embedded into tendering criteria to encourage innovation and ensure reliability.
The plastic pipe industry must continue advancing stewardship practices, improving reprocessing capacity and investing in material innovation. A coordinated national stewardship scheme will help scale recovery across all sectors, including rural and decentralised systems.
A model for circular infrastructure
Plastic pipes exemplify how infrastructure products can embody circular economy principles. Designed
for longevity, they are repairable, reusable and ultimately recyclable. Their durability reduces
material turnover and minimises environmental impact over many decades.
“PIPA is proving that a circular economy is commercially viable, creates jobs, builds new skills and solves complex problems – all using less virgin resources,” said Lisa McLean, managing director & CEO of Circular Australia. “While there is always continuous improvement in designing out waste and moving away from virgin consumption by utilising secondary resources – the plastic pipes industry has paved the way for other sectors. They can learn how to value and repair assets as a core operation to ensure they last as long as plastic pipes do – and for many that’s 100 years or more.”
By documenting the sector’s achievements and mapping pathways for improvement, the study challenges misconceptions that all plastics are inherently unsustainable. It highlights the need to distinguish between short-life consumer plastics and long-life engineered materials when assessing circularity.
With targeted policy recognition, stronger data, and coordinated recovery systems, the plastic pipe sector can stand as a flagship for circular economy success in durable infrastructure.
“This research provides a comprehensive and timely examination of the systemic factors impacting circularity within plastic pipe systems,” said Dr Simran Talwar, program lead and research director at UTS Institute for Sustainable Futures. “The findings point to a variety of circular economy approaches and product stewardship initiatives underway. The report recommendations highlight opportunities for policymakers and industry, to strengthen national stewardship, procurement, material flow data collection, and reporting, as well as cross-sectoral engagement.”