Jefferson County committee advances draft data-center regulations, delays community-benefits language pending legal review

Jefferson County committee members reviewed a near-final draft of land-use regulations for data centers on Feb. 18 and agreed to send most of the draft to the Planning & Zoning Commission for a March 12 public hearing while postponing detailed action on a submitted community benefits agreement until legal review is complete.

The presentation, led by Mitch Baer, walked the committee through the draft’s key elements and schedule. Baer told the committee the Planning & Zoning Commission will hold a public hearing March 12 and that, if recommended, the county council could introduce an ordinance in April. “Within 5 years of operation, the data centers, we’ve upped that to 60%,” Baer said, describing an energy-certification timeline that requires an initial 40% renewable share at occupancy and a 60% target within five years.

Why it matters: The draft ties siting and technical rules — setbacks, noise limits, cooling technology and energy sourcing — to real-world protections for adjacent residents and county infrastructure. Committee discussion focused on whether the draft is legally defensible, how to certify renewable supply, and how to enforce noise, water and air-quality standards.

Most important provisions and debate

- Setbacks and design: The draft requires principal structures to be set back 200 feet from nonresidential property and 500 feet from residentially developed property with density greater than one dwelling unit per two acres; parking and facade requirements were also tightened to limit visual and noise impacts on nearby homes.

- Noise and generators: The draft requires emergency-generator enclosures or housings that achieve at least a 25 dBA reduction at the enclosure. Baer emphasized that property-line decibel limits still apply: the enclosure requirement is intended to help meet the county’s boundary limits.

- Renewable energy and certification: The ordinance language requires a data center to certify at occupancy that at least 40% of annual electricity consumption is derived from renewable sources or qualifying utility programs; within five years the draft requires 60% renewables unless a documented technical infeasibility justifies an extension.

- Water and cooling: The draft prohibits once-through cooling systems and requires liquid-cooled closed-loop cooling with limited evaporation; it also requires on-site reuse of wastewater and stormwater to reduce potable-water demand and requires applicants to rely on the respective public water district rather than private wells.

- Air quality and refrigerants: Applicants must submit an air-quality impact assessment addressing generator operations, refrigerant leakage and construction-phase emissions consistent with Missouri Department of Natural Resources and EPA standards; the draft asks facilities to use refrigerants with global-warming potential below 750 and to file semiannual compliance reports.

- Monitoring and third-party review: Best-management practices (BMPs) must be inspected at least semiannually by a county-selected third party (developer pays expenses); the county will accept complaint-driven investigations and may pursue civil injunctive relief.

- Enforcement and decommissioning: The draft authorizes civil penalties (up to $1,000 per day for noncompliance as currently written) and requires a decommissioning and site-remediation plan updated at least every five years; the draft includes a 12-month remediation timeline and contemplates surety/bond alternatives or reuse strategies to avoid derelict sites.

Community benefits agreement on hold

Committee members repeatedly flagged legal constraints on imposing developer exactions and emphasized the need for legal review before adopting any community-benefits language. The county attorney and staff cited U.S. Supreme Court precedents (Nolan, Dolan, Koontz and related cases) that require a nexus and proportionality analysis for exactions. Baer said the practical vehicle may be a development agreement that offsets adverse impacts without creating the appearance of contract zoning; members agreed to wait for legal advice before acting on the 34-page CBA submission.

Public comment and next steps

Two residents spoke during public comment. Alan Lederbrand, a Jefferson County resident, praised the larger residential setback but urged tighter controls on cooling-tower noise and stronger penalties for noncompliance; he warned that a $1,000-per-day penalty may be too small to deter large corporations. Jerry Hill urged the committee to reject data-center projects and asserted, based on his research, that some centers have insufficient air permits and monitoring; Hill stated, “This is a violation of the Clean Air Act.” Those allegations were not resolved during the meeting.

The committee agreed to transmit the substantive draft (excluding final CBA language) to the Planning & Zoning Commission for a March 12 hearing and tentatively scheduled a follow-up committee meeting for March 4 to review legal feedback and any edits. A motion to approve the meeting’s agenda passed by voice vote at the start of the session (detailed vote tallies were not recorded in the transcript). The committee adjourned at the end of the meeting.

What’s next: Planning & Zoning will take public testimony on March 12; the committee will reconvene after legal review to consider any required changes to the CBA/development-agreement language before final county-council action.