Zoning in Linn County: The EU-3 Data Center District and Its Moratorium

Why Linn County built a zoning district specifically for data centers

Linn County's Unified Development Code, Chapter 107 of the county's Code of Ordinances, organizes unincorporated land into zoning districts and overlay zones administered by the Planning & Zoning Division. As data-center development pressure grew in the Cedar Rapids area -- reporting describes Linn County as facing its third major data-center proposal -- the Board of Supervisors created a new district specifically to handle it: the EU-3 'Exclusive Use-Three, Large-Scale Data Center District,' given final approval on February 18, 2026 after a formal text-amendment process (case PA26-0001) with multiple rounds of consideration and a staff report.

The ordinance's stated purpose is to provide 'a clear, comprehensive, and predictable regulatory framework for the siting and operation of large-scale data centers within unincorporated Linn County' -- language that signals the county was trying to get ahead of piecemeal, case-by-case rezoning requests rather than negotiate each one from scratch.

What EU-3 actually requires

The EU-3 district imposes a mandatory 1,000-foot setback between a large-scale data center and any residentially zoned property -- a materially larger buffer than most conventional industrial or commercial setbacks. Beyond the setback, a project must complete a water study during the planning process to demonstrate there is enough water available for the facility, and sign a water-use agreement with the county that includes ongoing tracking and reporting of actual water use. Developers must also sign an economic development agreement laying out specific community benefits, contribute to a community betterment fund, compensate the county for any damage to roads or infrastructure caused by construction, and comply with limits on noise and light pollution.

Taken together, these requirements are unusually specific and quantified compared to a typical conditional-use or overlay-district process -- most Iowa counties handling a novel land use like this would run it through a general conditional-use permit rather than build a dedicated, named zoning district with a numeric setback and mandatory water-reporting obligations written into the code itself.

The 18-month moratorium: why the county paused its own new district

Just months after finalizing EU-3, the Linn County Board of Supervisors approved an 18-month moratorium on accepting any new applications to rezone property to the EU-3 Large-Scale Data Center Zoning District in unincorporated Linn County, effective July 1, 2026. Reporting on the board's internal discussion describes a divided vote (2-1) getting to that outcome. A moratorium of this kind is typically used when a local government wants to stop new applications from coming in while it reassesses a policy it just adopted -- in this case, likely driven by community pushback, water-supply concerns, or a desire to evaluate how the first EU-3 project(s) perform before allowing more.

For a land buyer, the practical point is that Linn County's approach to large-scale industrial rezonings in its unincorporated area is genuinely in flux: a brand-new, detailed zoning district exists on paper, but the county is not currently accepting new applications to use it. If you own or are considering land near existing high-capacity electrical transmission or water infrastructure in unincorporated Linn County -- the kind of site a data-center developer would target -- confirm the moratorium's current status and expiration date directly with Planning & Development before assuming EU-3 rezoning is available, and don't assume the district's requirements as adopted in February 2026 will be the final version once the moratorium lifts.

What this means for zoning and rezoning generally in Linn County

Beyond the data-center story specifically, this episode is a useful signal about how Linn County handles zoning more broadly: it is an active, engaged jurisdiction that will write new, specific ordinance language in response to a real development pressure rather than stretch an existing general-industrial district to fit, and it is willing to pause its own newly created rules if the political or practical fallout warrants it. If you're planning any rezoning application in unincorporated Linn County -- data center or otherwise -- budget time for a real staff-report and Planning & Zoning Commission process (the Commission meets the third Monday of each month at the Jean Oxley Public Service Center), and don't assume a district's rules are static once adopted.