Calvert County (MD) — Data Center Text Amendments
Calvert County, Maryland · Calvert County, MD data-center text amendments (May 5, 2026)
Data center text amendments adopted by Calvert County BOCC. Amendments mandate closed-loop cooling systems, prohibit groundwater use for cooling, require developers to fund infrastructure upgrades, and enforce Tier 4 generator standards. Action taken May 5 after two prior failed motions (by Commissioners Mike Hart and Catherine Grasso) to enact a temporary 24-month moratorium.
Technical detail
Calvert County BOCC adopted data-center text amendments requiring compliance through construction start. Triggered by AWS job postings for a data-center build in Lusby; AWS submitted site plan documents April 15, 2026.
Who is protected: Calvert County residents (groundwater, energy infrastructure, public health from generators).
Who must comply: Data-center developers in Calvert County, MD.
Key facts
| Jurisdiction | Calvert County, Maryland |
|---|---|
| Level | County |
| Status | Proposed / pending |
| Protection strength | Limited protection |
| Effective date | 2026-05-05 |
| Enacted | 2026-05-05 |
| Citation | Calvert County, MD data-center text amendments (May 5, 2026) |
| Enforced by | Calvert County Department of Planning & Zoning |
| Penalties | Permit denial or conditional approval contingent on compliance. |
| Topics | data-center siting and energy · government use of AI |
| Last verified | 2026-06-25 |
| Official source | Calvert County, MD — Data Centers (official page) ↗ |
Related data-center siting and energy rules elsewhere
- SB 484 (FL Data Center Costs) · In effect
- Maine Data Center Moratorium (vetoed) · Vetoed
- VA Data Center Siting Bill (Vetoed) · Vetoed
- VA Data Center Tax Exemption · In effect
- VA Data Center Cost-Allocation Law · In effect
- Texas SB 6 (Data Center Grid Law) · In effect
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