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As commercial data center proposals expand across Wisconsin, municipalities must understand the limits of conditional use permit law. Sean P. Griffin, Associate Attorney at West & Dunn, explains why local governments seeking to restrict these developments need clear, measurable zoning standards and substantial evidence, not public opposition or subjective concerns.
Sean focuses on civil litigation, municipal law, and real estate disputes, and brings prior experience as a municipal City Planner to his work guiding businesses, property owners, and local governments through complex planning, zoning, and land use matters across Wisconsin.
Understanding Wisconsin’s Conditional Use Permit Law: Why Municipalities Face Uphill Battles Restricting Commercial Data Centers
By Sean P. Griffin
Attorney, West & Dunn
Across Wisconsin, local governments and rural communities are finding themselves at a tension point. The rapid expansion of artificial intelligence, cloud computing, and advanced digital infrastructure has driven a surge in commercial data center proposals. With large, flat parcels of land, access to crucial water resources, and an active labor force, our state is an attractive target for these massive technological developments.
However, as these projects are proposed, they frequently face stiff resistance from local residents. Concerns over localized energy drain, high water consumption for cooling systems, and aesthetic changes to rural landscapes routinely dominate town hall meetings. In response, some municipal boards and plan commissions have attempted to halt or severely restrict data center development.
But for municipalities relying on outdated zoning codes, pumping the brakes on a data center project is legally perilous. Under Wisconsin’s current laws, specifically 2017 Wisconsin Act 67, local governments have significantly limited discretion to deny a conditional use permit (CUP) if the developer checks the right boxes.
Here is a summary of Wisconsin’s conditional use permit law and why it prevents municipalities from arbitrarily restricting commercial data centers.
The Impact of 2017 Wisconsin Act 67 on Local Zoning Decisions
Prior to 2017, municipal boards possessed broad discretion when reviewing conditional use permits. A conditional use is simply a use that is generally compatible with a zoning district but requires individual review to ensure it fits the specific location. Before Act 67, local governments could deny a CUP based on generalized standards, such as a project being detrimental to the “public health, safety, and welfare,” or simply because of overwhelming community opposition.
Act 67 changed everything by removing this subjective discretion. The law created a uniform, statewide statutory framework that all cities, villages, towns, and counties must follow.
Under the statute, if an applicant meets, or agrees to meet, all of the requirements and conditions specified in the municipal ordinance, the local government must grant the conditional use permit.
The word must is key. The municipality no longer has the authority to arbitrarily veto a project simply because it is unpopular. Furthermore, Act 67 requires that any conditions imposed by a zoning board must be reasonable, related to the purpose of the ordinance, and, to the extent practicable, measurable.
The Substantial Evidence Standard
When a developer proposes a commercial data center requiring a CUP, the municipality’s decision to approve or deny the permit must be based on substantial evidence.
Act 67 defines substantial evidence as “facts and information, other than merely personal preferences or speculation, directly pertaining to the requirements and conditions an applicant must meet to obtain a conditional use permit and that reasonable persons would accept in support of a conclusion.”
This evidentiary standard is where many local resistance efforts legally fall apart. When residents pack a plan commission hearing to oppose a data center, their testimony often consists of personal fears regarding noise, generalized anxieties about the local water table, or subjective complaints about property values. Under Wisconsin law, uncorroborated fears, speculation, and preferences are explicitly excluded from the definition of substantial evidence.
If a data center developer provides expert engineering reports, hydrological studies, and traffic analyses showing that their facility will comply with the municipality’s stated zoning requirements, the town cannot legally deny the permit based solely on public outcry. If the board denies the permit without substantial evidence, the developer is highly likely to succeed in overturning the denial in court.
Why This Limits Municipal Restrictions on Data Centers
The strict framework of Act 67 creates several legal realities for municipalities attempting to block commercial data centers:
1. Vague Ordinances Are a Liability
Many Wisconsin municipalities are operating on zoning codes drafted a decade or more ago, long before commercial data centers were a localized reality. In these older ordinances, the conditions required for a CUP might be highly generalized (e.g., “must not cause excessive noise”). Because Act 67 demands that conditions be measurable and reasonable, vague standards are incredibly difficult to enforce. If a zoning code simply lists a data center or light industrial facility as a conditional use but fails to attach specific, measurable metrics (like exact decibel limits at the property line or precise landscaping buffer dimensions), the municipality has little legal footing to deny the permit once the developer agrees to the basic site plan.
2. Community Opposition Is Not a Legal Veto
Data centers are resource-intensive. They require immense amounts of electricity and water. While state lawmakers have recently debated bills (like SB 843 / AB 840) to impose state-level regulations on data center energy costs and closed-loop water recycling, the local zoning board is bound only by its local code. If a town’s zoning ordinance does not specifically limit municipal water draw for conditional uses, the plan commission cannot suddenly invent that rule during a public hearing just because citizens are angry.
Moving Forward: Proactive Planning is Essential
For developers, Wisconsin’s conditional use permit laws provide a high degree of predictability and protection. As long as a data center developer thoroughly prepares their application, provides expert-backed substantial evidence, and agrees to meet the measurable conditions of a local ordinance, their legal pathway to a permit is well-paved.
For municipalities, Act 67 serves as a harsh reminder that zoning codes must be proactively maintained. Town boards and plan commissions cannot rely on subjective judgments to protect their communities from large-scale development. If a local government wants to manage the influx of commercial data centers responsibly, it must audit and update its zoning ordinances before a developer files an application. Ordinances must outline specific, measurable, and reasonable conditions regarding noise, screening, environmental impact, and site reclamation.
Whether you are a developer seeking to navigate local zoning for a new technological facility, or a municipality looking to update its land-use regulations to comply with Act 67, expert legal guidance is critical. The era of subjective zoning decisions in Wisconsin is over; today, the facts, the evidence, and the precise letter of the ordinance dictate the future of local landscapes. To discuss how West & Dunn can assist with zoning, land use, or municipal law matters, contact us by phone at 608-535-6420 or through our Contact Us page.
