Fungi are often discussed in connection with forests, soils and decomposition. In urban settings, those same capabilities may support selected forms of nature-based infrastructure and environmental remediation. The opportunity is not to treat fungi as a universal replacement for engineered systems, but to consider where a fungal process could perform a useful function within a broader, carefully managed design.
For councils and municipal environmental teams, the central question is practical: can a fungal system help address a defined site problem safely, measurably and at a reasonable whole-of-life cost?
What fungi can contribute
Fungi form extensive networks through soil and other organic materials. They break down dead material, interact with plants and influence the movement of nutrients and water. Some fungi can also transform or bind certain pollutants under suitable conditions. These processes are commonly described as mycoremediation when they are used to help manage contamination.
In nature-based infrastructure, fungi may be considered as one component of a living system that also includes soil, plants, organic materials, water and microorganisms. Their possible roles include:
- supporting the breakdown of selected organic materials or contaminants;
- helping decompose organic waste streams where conditions are controlled;
- contributing to soil biological activity and the development of healthier growing media;
- forming part of planted systems designed to manage water, soil or habitat functions; and
- providing a biological process within a treatment bed, filter or other contained infrastructure element.
The suitability of these approaches varies widely. A fungus that performs well on one material or pollutant may be ineffective in another setting. Temperature, moisture, oxygen, acidity, competing organisms and the availability of suitable food sources can all affect performance.
Where fungal systems may fit in urban projects
Contaminated soil and land remediation
Fungal treatment may be worth investigating where a site contains organic contaminants and there is sufficient space and time for a managed biological process. A treatment area might involve contaminated soil mixed with suitable organic materials, or a contained bed designed to maintain the conditions needed for fungal growth.
This should normally be approached as a pilot or as one part of a remediation strategy. It may not be appropriate where contamination is highly variable, immediate risk reduction is required, or the treatment process cannot be reliably contained. Conventional excavation, isolation, treatment or disposal methods may still be needed for some areas.
Water and stormwater treatment
Fungi could be included in experimental or site-specific treatment media for water passing through a managed system. For example, a council might investigate whether a fungal layer or fungal-supporting organic medium can contribute to the treatment of a known pollutant in a contained flow path.
Any such design needs to account for changing flow rates, flooding, drying, clogging and the possibility that fungal material or pollutants could be moved off site. It should not be assumed that a visually healthy treatment bed is removing pollutants effectively. Water quality monitoring and hydraulic inspection are essential.
Organic waste and soil improvement
Fungi naturally decompose woody and other organic materials. This makes fungal processes potentially relevant to the management of selected green-waste streams, the production of soil amendments or the preparation of growing media. The value of the approach depends on the source material, contamination controls, processing conditions and the intended end use.
Materials intended for public landscaping or food-growing areas require particular care. A council should establish whether the input material contains contaminants, whether the finished product is suitable for its proposed use and how quality will be verified.
Planted and habitat-focused infrastructure
Fungal communities are a normal part of functioning soils and plant systems. In some nature-based designs, the aim may be to support a diverse soil community rather than to deploy a single named fungus. This could be relevant to revegetation, soil rehabilitation, urban habitat or planted drainage systems.
However, inoculating a site with fungi does not automatically improve plant establishment or ecosystem performance. Local soil conditions, plant selection, water availability and long-term management remain decisive. In many cases, protecting and improving existing soil biology may be more appropriate than introducing new organisms.
Designing a fungal system
A responsible design starts with the problem, not with the organism. The following steps can help a project team assess whether a fungal approach is justified.
1. Define the problem and the outcome
Describe the environmental or infrastructure problem in measurable terms. Is the objective to reduce a particular contaminant, manage organic material, improve soil function, support vegetation or provide a treatment step in a water system?
Set a baseline before construction or treatment begins. Useful outcomes may include contaminant concentrations, water quality, soil characteristics, vegetation establishment, flow performance or the volume of material diverted from disposal. Outcomes should be realistic and linked to the actual function of the project.
2. Assess site conditions
Characterise the site before selecting a design. Important considerations may include:
- the type, concentration and distribution of contamination;
- soil texture, drainage, moisture and acidity;
- seasonal temperature and rainfall;
- available space and access for construction and maintenance;
- flooding, erosion, vandalism and public access risks;
- nearby waterways, homes, food-growing areas and sensitive habitats; and
- the availability and quality of organic materials.
A site assessment may show that the proposed conditions are unsuitable for fungal activity, or that a different nature-based or engineered option would be more reliable.
3. Choose materials and containment carefully
Fungal systems need an appropriate physical environment. Organic substrates may provide structure and food, but they can also introduce weeds, pathogens, nutrients or contaminants if their source is not controlled. Designs should consider how materials will be delivered, stored, replaced and ultimately handled.
Containment is especially important where the system treats contaminated material. The design should prevent uncontrolled movement of soil, water, spores, substrate or concentrated pollutants. Any proposed use of non-local or introduced fungal species should receive appropriate ecological and regulatory assessment.
4. Plan maintenance from the beginning
Living systems are not maintenance-free. A maintenance plan may need to cover moisture management, vegetation care, inspection of drainage and containment, replacement of exhausted substrate, weed control, odour management and safe handling of treated material.
It should also identify what happens if the fungal process slows or stops. A system that depends on ideal conditions without a contingency plan may create operational or compliance problems.
5. Monitor performance and adapt
Monitoring should test the stated objective rather than simply confirm that fungi are present. Depending on the project, this could include sampling soil or water, checking flow rates, observing vegetation and recording maintenance requirements.
Monitoring results should have predefined decision points. For example, the project team may need to adjust the substrate, change water management, extend the trial, add another treatment step or discontinue the approach. Independent technical review may be appropriate for higher-risk sites.
Affordability and environmental responsibility
A fungal system may use locally available materials and natural processes, but that does not make it automatically cheap or sustainable. Costs can arise from site investigation, pilot testing, containment, monitoring, approvals, skilled maintenance, material replacement and end-of-life management.
A whole-of-life comparison should include the performance and risks of alternative approaches. It should also consider transport, energy use, land requirements, worker safety, public exposure, impacts on local ecosystems and the consequences of treatment failure.
Questions for councils before commissioning a project
- What specific problem is the fungal system expected to address?
- Is there credible evidence that the proposed process is suitable for this material and site?
- Is the concept established, a pilot-scale method or still experimental?
- What baseline information and success measures will be used?
- What are the risks to workers, the public, waterways, soils and nearby ecosystems?
- Are permits, environmental approvals, waste controls or other regulatory requirements likely to apply?
- Who will operate, inspect and maintain the system, and for how long?
- How will treated materials, spent substrate and monitoring data be managed?
- What is the contingency if the system underperforms?
- How does the proposal compare with conventional remediation and other nature-based options?
A measured path to implementation
The most responsible pathway is usually staged: define the problem, assess the site, consult suitably qualified specialists, test the concept at an appropriate scale, monitor results and expand only when the evidence supports doing so. This approach allows councils to explore the potential of fungi without overstating what they can deliver.
Fungal systems may have a useful place in urban infrastructure where their biological functions match local conditions and where design, containment, monitoring and long-term management are taken seriously. Their strongest role is likely to be as a carefully selected component of an integrated strategy—not as a universal answer to urban contamination, stormwater or soil problems.