Zurich's Duplicate Image Problem: What Happens Next and the Key Decisions Ahead

Zurich's municipal administration is facing a decision it can no longer defer. Across several of the city's core digital infrastructure systems — including the Grundbuchamt property registry, the Stadtarchiv on Neumarkt, and planning databases maintained by the Amt für Städtebau — tens of thousands of duplicate scanned images have accumulated over the past decade, creating retrieval bottlenecks and compliance headaches that administrators say are getting harder to ignore.

The problem is not new, but its urgency is. The city's 2024 digitisation push, which accelerated following the adoption of the cantonal E-Government Strategy 2023–2027, brought enormous volumes of legacy paper records into digital form in a compressed timeframe. That speed came with a cost: inadequate deduplication protocols meant that many documents were scanned multiple times, often by different departments using incompatible metadata standards. The result is a patchwork of redundant files sitting across servers managed by Stadt Zürich's IT-Services unit at Werdmühleplatz.

Why the Decision Can't Wait Much Longer

Swiss data protection law tightened significantly when the revised Federal Act on Data Protection came into force on 1 September 2023. Under the new rules, organisations must be able to locate, correct, or delete personal data on request — a requirement that becomes acutely difficult when multiple versions of the same document exist under different file identifiers in different systems. For a city the size of Zurich, with a registered population of roughly 448,000 as of early 2026, the volume of affected records runs into the hundreds of thousands of individual files.

ETH Zurich's Data Science Lab has been in informal contact with city IT officials about potential automated deduplication approaches, though no formal contract or pilot program has been announced. The Swiss federal government's own E-ID rollout, which began reaching cantonal administrations in late 2025, is adding further pressure: linking digital identities to clean, non-duplicated records is a prerequisite for the system to function as designed.

Budget is the central tension. A 2025 internal audit by the city's Finanzkontrolle — details of which have not been publicly released — reportedly flagged the duplicate image backlog as a medium-priority risk. Resolving it through a dedicated software solution is estimated by IT procurement specialists familiar with comparable European municipal projects to cost anywhere between CHF 800,000 and CHF 2.5 million, depending on whether the city chooses an off-the-shelf deduplication tool or commissions a bespoke integration with its existing SAP-based document management environment.

Three Paths Forward, and Who Controls the Fork

City administrators are weighing three broad options. The first is a phased manual review, assigning archival staff at the Stadtarchiv and Grundbuchamt to work through backlogs department by department over two to three years. That approach is cheap upfront but consumes staff hours that smaller offices simply don't have. The second is a licensed automated solution — several vendors already active in German-speaking public administration markets, including providers used by the Canton of Bern and the city of Basel, offer systems that can flag duplicates with high accuracy within weeks of deployment. The third option, increasingly discussed in city IT circles, is to treat the problem as a trigger for a broader infrastructure consolidation, migrating all imaging systems to a unified platform rather than patching the current fragmented setup.

The political dimension matters too. Zurich's Gemeinderat will likely be asked to approve any budget line above CHF 500,000, which means the question lands in public debate. Several Gemeinderäte with seats on the city's digital governance committee have signalled interest in the issue, though no formal motion has yet been tabled. A decision on which path to take is widely expected before the end of the third quarter of 2026, ahead of the city's annual budget deliberations in October.

For residents and businesses that interact regularly with city records — property buyers on Limmatstrasse, architects filing plans with the Amt für Städtebau, law firms pulling historical documents from the Stadtarchiv — the practical advice for now is straightforward: if you submit a formal information request and receive a document that appears inconsistent with earlier versions, flag it in writing to the issuing office immediately. The city has a legal obligation to investigate and correct such discrepancies under the revised data protection framework, and documenting the problem now creates a paper trail that strengthens any future complaint.