Which places have paused or refused data centres over water?
Water has moved from a reporting preference to a planning constraint. In Canada, Mississauga paused data-centre approvals on 29 July 2026 and Oakville followed with an interim control bylaw on 11 August 2026. In the United States, Tucson city council rejected the Project Blue development 7-0 in 2025, and Virginia and Utah have both legislated mandatory water reporting beginning in 2027.
The pattern is consistent across jurisdictions. A proponent states that a facility will be closed loop or will use little water, the community asks how that will be confirmed, and no mechanism exists to answer. The decision then turns on trust rather than evidence, which is a poor basis for approving infrastructure that lasts decades.
Alberta illustrates the supply-side version of the same constraint. The southern basins are closed to new allocation, so new industrial water moves by transfer, and the province passed a Water Amendment Act intended to improve water monitoring and transparency.
For an operator, the practical consequence is schedule risk rather than water cost. A development that cannot demonstrate its water position carries the cost of delay, which is generally far larger than the cost of measuring properly.
Sources
Mississauga paused data-centre approvals on 29 July 2026; Oakville passed an interim control bylaw on 11 August 2026
CBC NewsTucson city council rejected Project Blue 7-0 amid community pressure
Arizona Luminaria, 6 August 2025Ontario published a data-centre playbook on 13 August 2026
Government of Ontario