ISO 37120 — Sustainable Cities and Communities Indicators: A Complete Implementation Guide

Quick Reference Box

1. Introduction

By 2050, almost 70% of humanity will live in cities. Urban areas already generate over 80% of global GDP, consume two-thirds of global energy, and produce more than 70% of energy-related GHG emissions. The decisions made by mayors, city managers, and urban planners over the next decade will shape the trajectory of climate, equity, and economic resilience worldwide. Yet most cities still cannot answer basic questions about their own performance with comparable, internationally recognized data.

ISO 37120 is the international standard that closes this gap. It defines a comprehensive set of indicators for city services and quality of life, structured to enable consistent measurement, benchmarking, and reporting across cities of any size, geography, or governance model. ISO 37120 sits at the heart of an ISO city-standards family, complemented by ISO 37122 (smart city indicators), ISO 37123 (resilient city indicators), ISO 37101 (sustainable development management system), and the broader ISO 37100 series.

The standard was developed under the leadership of Professor Patricia McCarney at the University of Toronto and the World Council on City Data (WCCD), which now operates the global certification scheme and the open data portal for certified cities.

This implementation guide is written for city managers, sustainability directors, planning leads, ESG advisors to municipalities, and consulting teams supporting urban governments. It walks through the indicator structure, the data collection approach, the WCCD certification pathway, common challenges, and the strategic uses of certified city data.

2. Scope & Application

ISO 37120:2018 specifies 104 indicators across 19 themes that together describe a city's performance, services, and quality of life. The indicators are split into:

• 45 core indicators — required for any conforming report; the minimum to demonstrate ISO 37120 conformance.
• 59 supporting indicators — recommended where data permits.

The 19 themes are: economy; education; energy; environment and climate change; finance; governance; health; housing; population and social conditions; recreation; safety; solid waste; sport and culture; telecommunication; transportation; urban/local agriculture and food security; urban planning; wastewater; and water.

ISO 37120 is city-size agnostic. It is used by cities ranging from London (population 9 million+) and Buenos Aires (3 million+) to mid-size and small communities of under 100,000 residents. WCCD certification is achieved by cities such as Boston, Dubai, Los Angeles, Helsinki, Melbourne, Toronto, Bogotá, Buenos Aires, and many others.

Typical applications include: - Annual city performance reporting against SDG 11 (Sustainable Cities and Communities) - Investor and bond-rating disclosures (green and social municipal bonds) - City-to-city benchmarking and learning networks (C40, ICLEI, GCoM) - National program reporting (e.g., national climate strategies) - Sustainability strategy development and target setting - Service delivery improvement (waste, water, transport, energy)

ISO 37120 is a measurement standard, not a management system. It does not prescribe targets or thresholds; it specifies how each indicator must be defined, calculated, and reported, so that values are comparable across cities. Cities seeking a management-system approach can pair ISO 37120 with ISO 37101 (sustainable development management system for communities).

3. Key Requirements & Core Concepts

3.1 Indicator Definitions

Each ISO 37120 indicator has a precise definition: numerator, denominator, units, calculation formula, source data, and interpretive notes. For example, indicator 7.1 (greenhouse gas emissions per capita) is defined as total CO₂e emissions divided by population, with normalized scopes and reporting boundaries to ensure cross-city comparability.

3.2 Core vs. Supporting Indicators

The 45 core indicators must be reported. Supporting indicators are reported when feasible and are increasingly used to differentiate Platinum-level certification from lower tiers.

3.3 Data Quality

Cities must provide data with documented sources, methods, and date ranges. Data quality is graded by WCCD verifiers as part of certification, considering source reliability, recency, completeness, and computation transparency.

💡 Pro Tip — Build a single indicator master spreadsheet from day one. One row per indicator, with definition, owner, source, latest value, and verification status. The same file becomes the WCCD submission and the ongoing performance dashboard.

3.4 Reporting Boundaries

ISO 37120 defines the city as the geographically and administratively recognized municipal entity. Where data is only available at the metropolitan or county level, the city may report alternative geographies but must disclose this clearly.

3.5 Comparability and Time Series

Indicators are designed for cross-city and cross-year comparability. Cities are encouraged to maintain at least three years of consecutive data to identify trends and inform policy.

💡 Pro Tip — Publish a "data caveats" note alongside the indicators. Verifiers and external users respect and reward transparency; an explicit list of known data gaps strengthens credibility rather than weakening it.

3.6 Linkages to ISO 37122 and ISO 37123

ISO 37122 adds indicators specifically for smart city performance (e.g., open data, real-time service indicators), while ISO 37123 covers resilient cities (e.g., shock and stress preparedness). Cities pursuing the highest WCCD certification level (Platinum) typically report against all three standards.

💡 Pro Tip — Sequence the standards: 37120 first, then 37122 and 37123 in subsequent annual cycles. This builds capability without overwhelming a small data team and aligns with the WCCD audit cadence.

3.7 Reporting Frequency and Format

Annual reporting is recommended. WCCD-certified cities publish their data on the WCCD Open Data Portal, where it is publicly accessible for benchmarking and research.

4. Approach

4.1 Phase 1 — Council and Sponsorship

Secure executive sponsorship from the mayor's office or city manager. ISO 37120 implementation requires data from across the city's directorates — finance, public works, planning, transportation, environment, public safety, public health — and only senior leadership can mandate participation.

4.2 Phase 2 — Indicator Owner Mapping

Assign each of the 104 indicators to an accountable directorate and named owner. The mapping exposes data ownership ambiguities that often turn out to be the root cause of poor city KPIs.

4.3 Phase 3 — Baseline Data Collection

Collect available data for each indicator. Expect 60–80% of indicators to have usable data on first pass; the remainder will require methodology agreements, new data flows, or proxies.

4.4 Phase 4 — Methodology and Gap Closure

For indicators with weak or missing data, agree a methodology (e.g., for GHG inventory, use the Global Protocol for Community-Scale Greenhouse Gas Emission Inventories — GPC). Set up new data flows where required.

4.5 Phase 5 — Internal Validation

Cross-check data against external sources (national statistics, sectoral regulators, peer cities). Document any discrepancies.

4.6 Phase 6 — WCCD Submission and Certification

Submit data to the WCCD via their portal. The WCCD verification team assesses the submission and issues certification at Platinum, Gold, Silver, Bronze, or Aspirational levels based on indicator coverage and data quality.

Implementation Roadmap

5. Certification Process

The World Council on City Data (WCCD) operates the only ISO 37120-aligned certification scheme. It also certifies against ISO 37122 (smart) and ISO 37123 (resilient).

The certification levels are:

• Platinum — high coverage of core, supporting, smart, and resilient indicators with strong data quality.
• Gold — full core indicator coverage with strong supporting indicator coverage.
• Silver — full core indicator coverage with moderate supporting coverage.
• Bronze — most core indicators covered with credible data.
• Aspirational — entry-level recognition of cities beginning the journey.

The WCCD process includes a technical verification of indicator definitions, data sources, and calculations; a data quality assessment; and a certification decision. Certified cities are added to the WCCD Global Cities Registry and their data published on the open data portal, enabling benchmarking with peer cities.

Certificates are valid for one year, with annual data updates required for continued listing. Cities pursuing Platinum typically pair ISO 37120 with ISO 37122 (smart) and ISO 37123 (resilient) for full-spectrum certification under the broader ISO 37100 family.

⚠️ Warning — Not every "smart city certification" claim is WCCD-aligned or ISO 37120-conformant. Verify the certifying body and the underlying standard before relying on a comparison.

6. Common Challenges & Solutions

Problem 1: Indicator data sits in different directorates with no shared owner. Solution: Appoint an enterprise data steward in the city manager's office; codify indicator owners in performance contracts. Outcome: Data flows reliably each year without escalation.

Problem 2: City boundaries differ from where data is collected (utilities, school boards, statistics). Solution: Document boundary alignment per indicator; where misalignment is unavoidable, disclose and use proxy ratios. Outcome: Transparent, comparable indicators with clear caveats.

Problem 3: GHG inventory uses inconsistent methodology year-on-year. Solution: Adopt GPC BASIC+ as the standing methodology; document base year and recalculation triggers. Outcome: Credible time series for SDG 13, climate plans, and bond disclosures.

Problem 4: Resident perception and quality-of-life indicators lack data. Solution: Use a biannual residents' survey aligned with ISO 37120 indicator definitions, supplemented by digital pulse surveys. Outcome: A robust, defensible data source for soft indicators.

Problem 5: Political turnover threatens program continuity. Solution: Embed ISO 37120 reporting into statutory annual reporting and link key indicators to bond covenants where applicable. Outcome: Continuity across electoral cycles.

7. Benefits

ISO 37120 transforms city management from anecdote to evidence. Mayors can defend budget decisions with comparable data; investors gain confidence in green and social bond proceeds; residents see transparent performance against international peers. WCCD-certified cities consistently report measurable benefits across financing, planning, and citizen engagement.

The standard also enables city-to-city learning at speed. A city facing a waste management decision can identify peer cities of similar size that have solved the problem and learn directly from comparable data.

Benefits Matrix

8. Tools & Resources

Cities implementing ISO 37120 typically deploy a combination of:

• WCCD portal — submission and benchmarking
• Urban Observatory dashboards, City Performance Tool, and OECD city dashboards
• GPC (Global Protocol for Community-Scale GHG Inventories) for indicator 7
• ICLEI ClearPath for climate inventories
• CDP-ICLEI Unified Reporting System for environmental disclosures
• OECD Better Life Index for benchmarking quality-of-life indicators
• ESRI ArcGIS / Carto / open-source GIS for spatial indicators

Reference frameworks aligned with ISO 37120 include UN SDG indicators (especially SDG 11), the New Urban Agenda, the Sendai Framework for Disaster Risk Reduction, and the Global Covenant of Mayors for Climate and Energy Common Reporting Framework.

ISO Xpert provides ISO 37120 implementation training, indicator gap assessments, and WCCD submission support for cities and consulting teams.

📥 Downloadable Checklist: ISO Xpert offers a 104-indicator readiness matrix and a city data steward role description, both available via the ISO Xpert Resource Center.

9. Case Study

Mid-size European capital city (population 720,000, metropolitan population 1.6 million).

The city committed to WCCD Gold certification within 18 months as part of its bid to issue a EUR 500 million sustainability-linked bond. The Mayor's office mandated participation across 14 directorates and established a small ISO 37120 program team in the city manager's office.

The baseline assessment found that 71% of indicators had usable data, 19% required methodology agreement and new data flows, and 10% required new data instruments such as a residents' survey. The largest gaps were in cultural participation, recreation, and certain ICT indicators, which had previously been reported only in narrative form.

The city aligned its GHG inventory with GPC BASIC+, deployed a quarterly resident pulse survey, and federated departmental data through a single dashboard maintained by the data steward.

Outcomes: WCCD Gold certification achieved at first submission; the sustainability-linked bond closed at a 9 basis-point spread tightening attributed by lead managers to indicator transparency, equivalent to roughly EUR 4.5 million in interest savings over the bond life; nine peer-city benchmarks identified opportunities estimated at EUR 22 million in annual operating savings, of which EUR 7 million were realized in year one; and resident satisfaction with municipal transparency rose 14 points.

10. Conclusion

Cities are where the climate, equity, and economic battles of the twenty-first century will be won or lost — and ISO 37120 provides the measurement infrastructure to fight them with evidence, not anecdote. The standard is mature, the certification scheme is established, and the strategic returns — financing, planning, citizen engagement — are demonstrable.

Implementation is achievable in 12–18 months, scales to cities of any size, and integrates with national, climate, and SDG reporting. The cities that move now will define benchmarks the rest of the urban world will be measured against.

Ready to begin? ISO Xpert delivers ISO 37120 readiness assessments, indicator implementation, and WCCD submission support, alongside Lead Implementer training for city teams and consulting partners. Visit iso-xpert.com to schedule a city diagnostic or join the next ISO 37120 cohort.

11. Key Takeaways

✅ ISO 37120 specifies 104 city indicators across 19 themes ✅ It is paired with ISO 37122 (smart) and ISO 37123 (resilient) for full-spectrum reporting ✅ WCCD operates the global certification scheme at five tiers from Aspirational to Platinum ✅ Implementation is data-led; success requires senior sponsorship and indicator ownership ✅ Certified cities access lower-cost finance, peer benchmarks, and credible SDG 11 reporting

12. Frequently Asked Questions

Q1. Is ISO 37120 a management system? No. ISO 37120 is an indicator standard. The management system counterpart is ISO 37101.

Q2. How does ISO 37120 relate to the SDGs? Many ISO 37120 indicators directly populate SDG 11 (Sustainable Cities and Communities) and feed into SDGs 3, 6, 7, 9, 13, and 16.

Q3. Who certifies? The World Council on City Data (WCCD) operates the ISO 37120 certification scheme. It is the only globally recognized ISO 37120 certifier.

Q4. How long does first certification take? Typically 12–18 months for a city starting from limited data infrastructure; faster for cities with mature performance management systems.

Q5. What does it cost? Costs vary widely with city size and data maturity, ranging from USD 50,000 for a small, well-instrumented city to USD 250,000+ for a large city requiring new data flows.

Q6. How is ISO 37120 different from ISO 37122 and ISO 37123? ISO 37120 covers core sustainability indicators; ISO 37122 adds smart-city indicators; ISO 37123 adds resilience indicators. Together they provide a full-spectrum view.

Q7. Are smaller cities (<100,000 population) eligible? Yes. ISO 37120 is explicitly scalable; small cities have achieved certification.

Q8. Can ISO 37120 data be used for green bond reporting? Yes. It is increasingly cited in municipal sustainability-linked and use-of-proceeds bond frameworks.

Q9. How is data verified? WCCD assesses data sources, calculation methods, and recency during the certification submission. Some indicators require additional documentation.

Q10. How often is the data updated? Annually, with the WCCD listing updated each year. Cities not refreshing data lose listing status.

13. Glossary

• Core Indicator — Indicator required for ISO 37120 conformance.
• Supporting Indicator — Recommended indicator beyond the core set.
• Theme — One of 19 indicator groupings (e.g., transportation, water, safety).
• WCCD — World Council on City Data, the global certification scheme operator.
• GPC — Global Protocol for Community-Scale Greenhouse Gas Emission Inventories.
• City Boundary — Administratively defined municipal area used for reporting.
• Per Capita Indicator — Value normalized by population.
• Data Steward — Accountable individual for data quality across directorates.
• Data Quality Grade — WCCD assessment of indicator credibility.
• Indicator Owner — Directorate or individual accountable for an indicator.
• Smart City Indicators — ISO 37122 indicators for digital and connected services.
• Resilient City Indicators — ISO 37123 indicators for shock and stress preparedness.
• Open Data Portal — Public WCCD-hosted dataset of certified city indicators.
• Sustainability-Linked Bond — Municipal bond with KPI-linked coupon.
• Quality of Life — Composite indicator group covering health, safety, recreation, and similar.

14. References & Further Reading

External - ISO 37120:2018 — Sustainable cities and communities — Indicators for city services and quality of life - ISO 37122:2019 — Indicators for smart cities - ISO 37123:2019 — Indicators for resilient cities - World Council on City Data (WCCD) — Open Data Portal and certification scheme - Global Protocol for Community-Scale GHG Emission Inventories (GPC)

ISO Xpert Internal - ISO Xpert — ISO 37101 Sustainable Development in Communities Implementation Guide - ISO Xpert — ISO 14064 Greenhouse Gas Implementation Guide - ISO Xpert — Smart Cities Strategy Practitioner Guide

15. Author Bio

Written by ISO Xpert Consultants — a global team of certified Lead Implementers, urban policy specialists, and data scientists supporting cities, metropolitan authorities, and national programs across every continent. ISO Xpert combines technical depth in the ISO 37100 family with hands-on experience delivering WCCD certification.

16. Related Articles

1. ISO 37101 Sustainable Development in Communities — Implementation Guide
2. ISO 37122 Smart City Indicators — Implementation Guide
3. ISO 37123 Resilient City Indicators — Implementation Guide
4. ISO 14064 Greenhouse Gas Quantification — Implementation Guide
5. ISO 14091 Climate Change Adaptation — Implementation Guide

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