Case study: Circularity metrics, LCA & reporting — a city or utility pilot and the results so far

Amsterdam's circular economy monitor measured a citywide material consumption rate of 73 million tonnes in 2023, yet only 12% of those materials re-entered productive use, according to the municipality's 2024 annual circular economy report. That single data point catalyzed a multi-year effort to build a comprehensive circularity metrics, life cycle assessment (LCA), and reporting framework that has since become a reference model for cities across North America and Europe. The Amsterdam pilot demonstrates both the transformative potential and the grinding operational complexity of measuring circularity at the municipal scale.

Why It Matters

Cities control roughly 70% of global material consumption and generate approximately 50% of global waste, according to the United Nations Environment Programme's 2025 Global Resources Outlook. Despite this, fewer than 3% of cities worldwide have implemented structured circularity measurement systems. The absence of reliable metrics means that most municipal circular economy strategies operate without baseline data, performance targets, or accountability mechanisms.

Regulatory pressure is accelerating. The European Union's Circular Economy Action Plan requires member states to report on material circularity indicators beginning in 2026, while in North America, California's SB 54 mandates measurable progress toward reducing single-use plastic packaging by 25% by 2032. New York City's Local Law 97 and similar building performance standards increasingly require embodied carbon reporting, which depends on LCA methodologies. Without standardized measurement frameworks, cities cannot demonstrate compliance, track progress, or allocate resources effectively.

The financial stakes are significant. Circle Economy's 2025 Circularity Gap Report estimated that transitioning to a circular model could reduce global material extraction by 28% while generating $4.5 trillion in economic value annually by 2030. At the municipal level, the Ellen MacArthur Foundation found that circular strategies in construction, food systems, and mobility could reduce city material costs by 15-25% while creating 2-3 times more jobs per tonne of material processed compared to linear disposal. Capturing these benefits requires robust measurement systems that track material flows, quantify environmental impacts through LCA, and enable transparent reporting to stakeholders.

Key Concepts

Material Flow Analysis (MFA) quantifies the stocks and flows of materials through a defined system boundary, in this case, a city. MFA tracks raw material inputs, product manufacturing, consumption, waste generation, recycling, and exports. Amsterdam's MFA covered 21 material categories across seven economic sectors, creating a comprehensive map of the city's material metabolism. The methodology follows Eurostat's economy-wide MFA guidelines, adapted for sub-national application with additional granularity for construction minerals, biomass, and metals.

Material Circularity Indicator (MCI) provides a single score between 0 and 1 that reflects how restorative material flows are within a system. Developed by the Ellen MacArthur Foundation in collaboration with Granta Design, the MCI accounts for recycled content in inputs, the fraction of products collected for recycling or reuse at end of life, and the efficiency of recycling processes. Amsterdam adapted the MCI from product-level to city-level application, weighting sectors by their contribution to total material throughput.

Life Cycle Assessment (LCA) evaluates the environmental impacts of products, processes, or services across their full life span, from raw material extraction through manufacturing, use, and end-of-life treatment. ISO 14040 and 14044 provide the methodological framework. Municipal LCA applications typically focus on construction materials, food systems, and energy infrastructure, the three sectors that collectively account for 75-85% of urban environmental footprints.

Circularity Reporting Frameworks translate raw MFA and LCA data into structured disclosures for policymakers, investors, and residents. The Global Reporting Initiative (GRI) Standards 301 and 306 address material use and waste, while the EU's Corporate Sustainability Reporting Directive (CSRD) requires double materiality assessments that incorporate circularity metrics. At the city level, the ISO 37120 series provides indicators for sustainable city management, though circularity-specific metrics remain under development.

Circularity Metrics: Benchmark Ranges for Municipal Programs

Metric	Below Average	Average	Above Average	Top Quartile
Material Circularity Rate	<8%	8-12%	12-18%	>18%
Construction Material Reuse Rate	<15%	15-30%	30-50%	>50%
Organic Waste Diversion Rate	<25%	25-45%	45-65%	>65%
LCA Data Coverage (% of procured materials)	<20%	20-40%	40-60%	>60%
Reporting Cycle Time (months)	>18	12-18	6-12	<6
Stakeholder Data Integration (% of suppliers reporting)	<10%	10-25%	25-50%	>50%

What's Working

Amsterdam's Circular Economy Monitor

Amsterdam launched its circular economy monitor in 2020 as the first European city to apply city-level MFA systematically across all major sectors. By 2025, the monitor tracked 73 million tonnes of material flows annually, covering construction, food, consumer goods, and organic waste streams. The city invested approximately EUR 4.2 million in data infrastructure, including integration with the national statistics office (CBS) and partnerships with Metabolic, a circular economy consultancy that developed the underlying data platform.

The results have been measurable. Amsterdam's material circularity rate increased from 9.2% in 2020 to 14.8% in 2025, driven primarily by construction material reuse mandates and expanded organic waste collection. The monitor identified that construction and demolition waste represented 62% of total material throughput, directing policy attention toward the highest-impact intervention point. The city subsequently required LCA documentation for all municipal construction projects exceeding EUR 5 million, resulting in a 22% reduction in embodied carbon across city-funded buildings between 2022 and 2025.

Austin, Texas: Circular Economy Indicators Dashboard

Austin became the first major US city to publish a comprehensive circular economy indicators dashboard in 2024, tracking 34 metrics across waste diversion, material reuse, local repair and reuse economic activity, and procurement circularity. The dashboard was developed in partnership with the US Zero Waste Business Council and the University of Texas at Austin, drawing on the city's existing Austin Resource Recovery data systems.

Austin's approach focused on data accessibility. All metrics are publicly available through an interactive dashboard updated quarterly, enabling residents, businesses, and policymakers to track progress against the city's 2030 zero waste goal. Key outcomes include: a 12 percentage point increase in commercial waste diversion (from 42% to 54%) between 2022 and 2025, driven partly by data-informed enforcement of the Universal Recycling Ordinance; and the identification of food waste as the single largest opportunity for diversion, leading to a dedicated organics collection pilot serving 45,000 households.

Peterborough, United Kingdom: Circular City Roadmap

Peterborough's Circular City Roadmap, launched in partnership with the Ellen MacArthur Foundation and Opportunity Peterborough, represents one of the most detailed municipal circularity measurement efforts in a mid-sized city (population approximately 215,000). The program established baseline MFA for four priority sectors: built environment, food and agriculture, water, and energy. By 2025, Peterborough had achieved a 31% reduction in per-capita waste generation and a 19% increase in material productivity (GDP per tonne of material consumed) relative to 2019 baselines.

The Peterborough model is notable for its integration of business engagement. Over 120 local enterprises participate in an annual circularity survey that feeds into the city's metrics framework, providing granular data on material inputs, waste outputs, and circular business model adoption. This bottom-up data collection complements top-down MFA estimates, improving accuracy and stakeholder buy-in.

What's Not Working

Data Fragmentation and Interoperability

The most persistent challenge across all pilot cities is data fragmentation. Material flow data resides in waste management systems, procurement databases, construction permit records, utility billing platforms, and private sector supply chain systems that rarely communicate with each other. Amsterdam spent 18 months and approximately EUR 1.5 million on data harmonization before the circular economy monitor could produce reliable outputs. Austin's dashboard team reported that 40% of the total project timeline was consumed by data cleaning, format reconciliation, and gap-filling for sectors where primary data was unavailable.

Standard classifications compound the problem. Waste categorization schemes differ between municipal, state, and federal reporting requirements. Construction material specifications use different nomenclatures than recycling facility intake classifications. LCA databases (such as Ecoinvent and GaBi) use product categorizations that do not map directly to municipal procurement codes. These interoperability gaps require manual data mapping that is both labor-intensive and error-prone.

LCA Methodology Inconsistencies

Applying LCA at the municipal scale exposes significant methodological challenges. System boundary definitions vary across practitioners: some assessments include upstream supply chain impacts (Scope 3 equivalent), while others limit analysis to within-city activities. Allocation rules for recycled materials remain contentious, the recycled content approach (attributing environmental credits to products using recycled inputs) and the end-of-life recycling approach (crediting the system that collects materials for recycling) can yield materially different results.

A 2024 study published in the Journal of Industrial Ecology compared LCA results from five European cities using nominally identical methodologies and found that differences in database selection, allocation rules, and system boundaries produced circularity impact estimates that varied by up to 45%. This variance undermines the credibility of cross-city comparisons and makes it difficult to identify genuine best practices versus methodological artifacts.

Political Cycles and Funding Continuity

Municipal circularity monitoring requires sustained investment across political cycles. Peterborough's program experienced a 30% budget reduction following a change in local government leadership in 2023, resulting in reduced data collection frequency and the loss of two dedicated staff positions. Amsterdam's monitor faced similar pressures when competing priorities during the pandemic diverted resources from circular economy initiatives. Without dedicated, multi-year funding commitments, monitoring programs risk degradation into reporting exercises that track only what is easily measurable rather than what is strategically important.

Key Players

Metabolic developed Amsterdam's circular economy monitoring platform and provides consulting services to over 30 cities globally on material flow analysis and circularity measurement.

Ellen MacArthur Foundation created the Material Circularity Indicator methodology and provides technical assistance to municipal circular economy programs through its Cities and Circular Economy for Food initiatives.

Circle Economy publishes the annual Circularity Gap Report and developed the Circle City Scan methodology, which has been applied in over 15 cities including Prague, Montreal, and Philadelphia.

US Zero Waste Business Council partnered with Austin to develop its circular economy indicators dashboard and provides certification and measurement frameworks for municipal zero waste programs.

Ecoinvent maintains the most widely used LCA database globally, with over 19,000 datasets covering materials, energy, transport, and waste treatment processes used in municipal circularity assessments.

Action Checklist

• Establish a cross-departmental circularity data working group including waste management, procurement, planning, and economic development
• Conduct a baseline material flow analysis covering at minimum construction, food, consumer goods, and organic waste streams
• Select and adapt a circularity indicator framework (MCI, GRI 301/306, or ISO 37120) appropriate for your city's reporting requirements
• Invest in data infrastructure that enables automated data feeds from waste management, procurement, and building permit systems
• Partner with a university or research institution for LCA expertise and methodological consistency
• Publish metrics on a publicly accessible dashboard with at least quarterly update frequency
• Require LCA documentation for all municipal construction projects above a defined threshold
• Allocate multi-year funding commitments (minimum 3-5 years) to ensure monitoring continuity across political cycles

FAQ

Q: How much does it cost to establish a municipal circularity metrics program? A: Based on the pilots reviewed, initial setup costs range from $500,000 to $5 million depending on city size, existing data infrastructure, and scope of coverage. Amsterdam's comprehensive program cost approximately EUR 4.2 million over four years. Austin's more targeted dashboard cost approximately $750,000 over two years. Ongoing annual operating costs typically run 15-25% of initial investment, covering data collection, analysis, platform maintenance, and staff.

Q: What is the minimum data infrastructure needed to start measuring circularity? A: At minimum, cities need: digitized waste collection and processing records with material category breakdowns, procurement data that identifies material types and quantities for major municipal contracts, and construction and demolition permit data. Many cities already collect this data but in disconnected systems. The initial investment is often in integration and harmonization rather than new data collection.

Q: How do we handle LCA data gaps for materials where no reliable environmental impact data exists? A: Use tiered data approaches. Primary (site-specific) data should cover the top 10-15 material categories by volume. Secondary data from established LCA databases (Ecoinvent, GaBi, USLCI) can fill gaps for less significant materials. For materials with no available data, use proxy datasets from chemically or functionally similar products and document assumptions transparently. The goal is directional accuracy, not false precision.

Q: How long before a circularity metrics program produces actionable insights? A: Expect 12-18 months from program launch to the first actionable baseline report. This includes 3-6 months for data scoping and collection, 3-6 months for analysis and quality assurance, and 3-6 months for stakeholder engagement and report preparation. Subsequent annual cycles are faster (6-9 months) as data pipelines mature and methodologies stabilize.

Q: Can smaller cities (under 100,000 population) justify the investment in circularity metrics? A: Yes, but the approach should be scaled appropriately. Smaller cities can use simplified MFA methodologies focusing on the two or three largest material streams, leverage regional LCA data rather than conducting city-specific assessments, and partner with neighboring municipalities to share analytical capacity and costs. The Circle Economy City Scan methodology is specifically designed for rapid, lower-cost assessments that can provide a useful starting point for cities with limited budgets.

Sources

• City of Amsterdam. (2024). Amsterdam Circular Economy Monitor: Annual Report 2024. Amsterdam: Municipality of Amsterdam.
• Circle Economy. (2025). The Circularity Gap Report 2025. Amsterdam: Circle Economy Foundation.
• Ellen MacArthur Foundation. (2024). Material Circularity Indicator: Methodology and Application Guide, v4.0. Cowes, UK: EMF.
• United Nations Environment Programme. (2025). Global Resources Outlook 2025: Natural Resources for the Future We Want. Nairobi: UNEP.
• Journal of Industrial Ecology. (2024). "Comparative Analysis of Urban Material Flow Assessment Methodologies Across Five European Cities." Vol. 28, Issue 4, pp. 812-829.
• Austin Resource Recovery. (2025). Austin Circular Economy Indicators Dashboard: Methodology and Results. Austin, TX: City of Austin.
• ISO. (2024). ISO 37120:2024 Sustainable Cities and Communities: Indicators for City Services and Quality of Life. Geneva: International Organization for Standardization.