Denver's Duplicate Image Problem: The Key Decisions Ahead for City Hall's Digital Records

Denver's Department of Technology Services is sitting on a sprawling archive of duplicate digital images embedded in city records, permit files, and public-facing databases — and the clock is running on what to do about them. The problem, which spans systems used by Community Planning and Development and the Denver Public Library's digital collections, has been building for years but is now pressing because the city's contract with its current cloud-storage vendor comes up for renewal in the fourth quarter of 2026.

The timing matters because duplicate image files inflate storage costs and slow retrieval systems that city employees use daily. At Community Planning and Development's office at 201 West Colfax Avenue, permit processors rely on an internal document portal to pull inspection photographs and zoning filings. When the same image appears three or four times under different file names — a common byproduct of multiple staff members uploading the same document — search times increase and the risk of mislabeling a record grows. The Denver Public Library's Blair-Caldwell African American Research Library on Welton Street faces a parallel challenge in its digitized photograph collections, where bulk scanning campaigns in 2021 and 2022 left thousands of duplicate image files scattered across different catalog nodes.

The Two Paths on the Table

City technology staff are weighing two broad options. The first is automated deduplication — software that identifies visually identical or near-identical files using hash-matching algorithms and flags them for deletion or consolidation. The advantage is speed; tools of this kind can process tens of thousands of files in a day. The risk is false positives. A photograph of the same street corner taken six months apart, under different lighting, may look identical to an algorithm but represent two distinct moments in a code-enforcement case. Delete the wrong one, and a legal record disappears.

The second option is a manual review process, likely contracted out to a records-management firm. Denver has used Recall Colorado, which operates a document services center in the metro area, for physical records management in the past. A comparable engagement for digital triage would take longer — city IT staff have estimated a thorough manual pass on the affected systems could run well into 2027 — but it offers a layer of human judgment that automated tools cannot replicate. The tradeoff is cost. Cloud storage for government entities typically runs between $0.02 and $0.05 per gigabyte per month, and while the city has not published the exact size of the affected archive, even a modest 50-terabyte backlog represents a recurring bill that compounds quarterly.

Denver City Council's Technology and Innovation Committee is scheduled to take up a broader digital-records governance resolution later this summer, and the duplicate-image question is expected to surface in that discussion. Council members representing Council District 9, which includes the Auraria Campus and much of downtown, have heard from constituents who experienced delays in accessing public records requests tied to development projects along the South Platte River corridor.

What Happens Next

The Department of Technology Services has until September 30, 2026 to submit a storage-renewal recommendation to the city's Chief Information Officer. That recommendation will almost certainly have to address the duplicate-image inventory, because carrying redundant files into a new contract period locks in unnecessary cost from day one.

Advocates for open-government access, including groups that regularly file Colorado Open Records Act requests with the city, are watching to see whether the cleanup process includes a public-notice period before any mass deletion. Colorado law requires agencies to follow approved records-retention schedules before destroying public documents, a requirement that applies to digital images just as it does to paper files. The Denver City Auditor's Office, which last reviewed the city's records-management compliance in 2023, has authority to flag any disposal process that bypasses those schedules.

The practical advice for anyone with a pending records request touching permit photographs or historical city images: file now, and follow up in writing. Requests logged before any deduplication sweep are more likely to be fulfilled from the complete archive. After the purge, some of that record may simply be gone.