Data Centers and Local Zoning in the St. Louis Region: A Patchwork Takes Shape
Data center development has become a hot-topic in local news cycles, and a significant land-use issue for developers in the St. Louis metropolitan region. As demand for artificial intelligence and cloud infrastructure grows, local governments are beginning to respond to increased development activity and mounting voter concern regarding issues like electricity demand and grid capacity, water consumption, air and noise impacts from backup generators and cooling equipment, compatibility with surrounding land uses, and appropriate setbacks and screening requirements.
There is currently no uniform approach to local zoning and regulation of data center development – instead there is a patchwork of varied approaches being rolled out by local municipalities and governments across the region. The City of St. Louis has enacted detailed zoning standards and set restrictions on municipal tax incentives, while St. Louis County is still actively considering newly proposed regulations. Several municipalities in St. Charles County have adopted bans or temporary moratoria. Metro East municipalities are beginning to consider the impacts of proposed projects. At this point, a development that appears viable in one municipality may be subject to entirely different restrictions a short distance away.
For developers, investors, landowners, lenders, and utilities, the consequence of the lack of uniform regulation is that data center development must be evaluated on a site-by-site basis. Factors like existing restrictions, proposed legislation, local approval procedures, utility capacity, and development costs should all be considered before finalizing land acquisition or other substantial commitments. It is critical to consult with counsel in the early stages of development to ensure that there is a smooth pathway towards zoning and local regulatory approval.
Recent Developments
To illustrate the emerging patchwork, the below summarizes key recent developments in local markets that developers, investors, landowners, lenders, and utilities should be aware of:
City of St. Louis
The City of St. Louis recently enacted Ordinance 72181 (Board Bill No. 49), effective September 17, 2026, adding Chapter 26.77 to its Zoning Code. The ordinance creates separate micro, standard, and major data center categories, and its use table requires conditional use approval in eligible districts. Major data centers are limited to the K Unrestricted District, while smaller classifications have additional district options. The classification of a proposed facility, zoning district, and required approval process therefore should be determined at the outset of a project.
Chapter 26.77 also establishes development and operating requirements. Among other provisions, the ordinance prescribes minimum separation distances from specified surrounding properties; addresses noise, cooling and backup generation building specs; and requires disclosure of certain utility and infrastructure information with an application. Standard and major data centers face renewable-energy benchmarks, and major facilities also require a Public Impact Agreement, requiring approval by the Board of Public Service and a two-thirds vote of the Board of Aldermen before issuance of a building permit. These requirements may materially affect site design, expense, and timing.
The City simultaneously enacted Ordinance 72182, restricting local tax incentives for data centers. The availability of public incentives should therefore be investigated separately from the question whether a project may receive zoning approval.
St. Louis County
The St. Louis County Department of Planning has been developing data-center-specific standards for unincorporated portions of the County. Its existing Zoning Ordinance did not contain a defined data center use category or tailored standards when the Department initiated its review. Public hearings occurred on May 11 and August 10, 2026, followed by an October 5 Planning Commission work session and executive meeting. On October 19, 2026, the Commission recommended a four-tier regulatory framework to the County Council, including proposed setbacks of up to 500 feet for the largest facilities and standards addressing energy consumption, water usage, noise, and ongoing compliance. The County Council has not yet adopted the proposed framework, but developers evaluating property in the area should be aware that more detailed data center development regulation is forthcoming.
City of St. Charles
In May 2026, the St. Charles City Council voted 7-1 to adopt a zoning prohibition on data centers, following substantial opposition to the then-proposed approximately $1 billion “Project Cumulus” development. This recent development bans zoning approvals in all of the city’s zoning districts, the most extreme new regulation that we have seen thus far.
St. Charles County
In July 2026, the St. Charles County Council adopted a six-month moratorium on large-scale data centers to evaluate utility, water, and related effects. The County’s explanatory materials describe the affected category as projects demanding more than five megawatts, occupying more than 100,000 square feet, or comprising multiple buildings operating together. The County has indicated that it invoked public health and environmental authority to reach incorporated areas as well as unincorporated property. Public hearings on the matter will begin this fall.
Wentzville
Similarly, the Wentzville Board of Aldermen separately approved a six-month moratorium in October 2026 while evaluating electrical infrastructure and water resources.
St. Peters
St. Peters also adopted a temporary restriction: Ordinance 8319, approved May 14, 2026, which provides for a moratorium of up to one year on specified development applications involving information-technology and data-processing facilities while the City reviews standards. The moratorium temporarily restricts the City's consideration of covered development applications, subject to certain exceptions.
Metro East (Illinois)
Finally, the Metro East area has begun to enact restrictions. Troy, Illinois, adopted Ordinance 2026-24 in March 2026, imposing a temporary data center moratorium, and Ordinance 2026-57 in September extending the moratorium for an additional six months. Godfrey also recently extended its moratorium on data center applications in August 2026. Granite City and Edwardsville have not recently approved any new data center projects and may also be considering enacting zoning updates to address data center concerns.
Key Takeaways for Developers, Investors, and Property Owners
Local regulation and zoning approvals for proposed data center developments are currently a moving target, with significant variation between municipalities and counties and overlapping requirements imposed by each in some instances. It will be critical to confirm whether property is inside an incorporated municipality, whether a countywide measure also applies, and whether any proposed annexation or pending zoning change could alter the applicable rules.
Consult with counsel early in the project development process to help review operative law and any potential changes. Qualified counsel will be able to help you verify use classification, conditional use requirements, size or power thresholds, exceptions, effective dates, and expiration provisions.
Factor infrastructure and mitigation obligations into your consideration of project costs. Utility commitments, water supply, setbacks, cooling systems, renewable-energy obligations, and public-impact arrangements may shape both underwriting and deal timing. Land-use approval may not ensure the availability of tax incentives or project feasibility once compliance with operational and design requirements have been met.
Work with counsel to reconfirm status at acquisition, application, and closing. Several jurisdictions are still drafting rules or operating under time-limited moratoria, and a project schedule can span material changes in the legal landscape.
Lewis Rice is well-versed in navigating the complexities of local regulatory requirements and zoning approval processes for large data center projects. The group is staying up to date on developing rules and proposals and is available to help clients determine the feasibility of project approval.
