St. Louis data center zoning bill heads to aldermen with noise, power rules
St. Louis, MO – Board Bill 49 would create city zoning rules for data centers, adding size classes, setbacks, utility disclosures and public review.
St. Louis aldermen are now weighing a proposed data center zoning ordinance that could set the city’s first detailed rules for where future facilities may be built and what developers must disclose before approval.
Board Bill 49 was introduced on June 18, 2026, after the St. Louis Planning Commission approved the recommended framework on June 10. City Board of Aldermen records show the bill has been referred to the Housing, Urban Development and Zoning Committee, which means the rules are pending legislation, not an adopted ordinance.
For residents, the bill is less about one building than about the next wave of requests. The introduced text says data centers do not currently have a specific definition in the city zoning code and historically have been regulated as office or warehousing uses. Board Bill 49 would add Chapter 26.77 to the zoning code and create a separate regulatory category for data centers.
Three sizes, different zoning limits
The bill would divide data centers into three classes. A micro data center would be less than 10,000 gross square feet and have maximum power demand under 5 megawatts. A standard data center would be more than 10,000 and less than 250,000 gross square feet, with power demand of more than 5 megawatts but less than 30 megawatts. A major data center would be more than 250,000 and less than 500,000 square feet, or have maximum power demand of 30 megawatts or more.
The use table matters for neighborhoods. Under the introduced bill, micro data centers would not be allowed in residential districts and would require conditional approval in several commercial, downtown, industrial or unrestricted districts. Standard data centers would be conditional uses only in the I, J and K districts. Major data centers would be conditional only in the K unrestricted district.
That does not amount to a citywide ban. It would instead make data center eligibility depend on both the size of the facility and the zoning district, with conditional-use review still required where the use is allowed.
Setbacks, noise and heat are central resident issues
Board Bill 49 would require data center buildings, backup generators and other noise- or light-emitting infrastructure to be set back from parcels in certain residential and commercial zones, parcels containing a light rail station or transit center, and parcels containing a school or public park.
The proposed setbacks are 150 feet for micro data centers, 300 feet for standard data centers and 600 feet for major data centers. For nearby residents, parents and transit users, those buffers are among the most practical parts of the proposal because they address how close heavy equipment could be to homes, schools, parks and major transit facilities.
The bill also includes operating and design standards. Facilities would have to address noise and vibration, screen exterior equipment, place noise-emitting equipment such as backup generators away from primary frontages, and use cool roof, green roof or rooftop solar options to reduce urban heat impacts. The proposal also calls for attention to outdoor lighting and heat-plume impacts.
Applicants would have to show more up front
Any new data center or expansion would have to submit information on its classification, site plan, building size, backup generators, cooling equipment, fuel storage, power lines, substations, battery storage, maximum power demand, cooling system, energy sources and renewable-energy plan.
Standard and major projects would face additional disclosures, including anticipated water use, power usage effectiveness, water usage effectiveness, generator testing schedules, flood-risk assessment, expected noise levels, fire systems, construction and operating timeline, and whether the developer plans to use Missouri’s sales-tax exemption program.
Major data centers would have the longest checklist. The introduced bill would require third-party environmental and economic impact reports, a utility-provider letter addressing potential ratepayer or grid-reliability impacts, and documentation of a community meeting. That meeting would require notice to nearby registered neighborhood organizations, residents and property owners within 1,000 feet, relevant city agencies and elected officials representing the surrounding area.
For major data centers, the bill also would require a Public Impact Agreement before a building permit is granted. The agreement could address site-specific issues such as noise, air quality, energy use, water use, wastewater treatment, landscaping, lighting, heat mitigation, cooling systems, backup generators, decommissioning and emergency management.
Why utilities are part of the debate
The Missouri Public Service Commission has separately been working on large-load utility tariffs for customers such as data centers. The PSC says the goal is to prevent residential and commercial customers from being charged unjust or unreasonable costs tied to service for large-load customers. That state process does not prove a specific St. Louis household rate increase from Board Bill 49, but it explains why power demand and grid planning are part of the local zoning conversation.
The city also has recent local context. In April, St. Louis announced approval of a conditional use permit for a data center project at the old Famous-Barr warehouse property, with conditions addressing water, power, noise, sustainability, jobs and community benefits. Board Bill 49 should not be read as retroactively changing every previously approved project unless the final ordinance says so.
The next step is committee review at the Board of Aldermen. Aldermen could amend, advance, delay or reject the bill. Residents and businesses near industrial corridors, schools, parks and transit centers have a reason to watch the committee calendar because the details will shape how future data center proposals are reviewed before they reach construction.
Sources
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