Tucson Water has launched a formal review of a new federal framework governing Lake Powell and Lake Mead operations through 2036, according to municipal announcements released on Friday, July 31. City officials evaluated how changing Colorado River conditions could impact municipal supplies through 2036, determining that local water service faces no immediate threat.
The U.S. Bureau of Reclamation released its Final Environmental Impact Statement, or FEIS, outlining future river operations after 2026. While the document establishes a long-term framework for the two critical reservoirs, it does not mandate specific water reductions for Tucson during 2027 or 2028, nor does it finalize voluntary conservation contributions for the municipality. Those determinations will emerge through subsequent federal operating guidelines and annual operating plans.
Tucson Water officials are treating the FEIS as a strategic planning guide rather than a final allocation order. For modeling purposes, the document incorporates elements from a May 2026 Lower Basin states proposal exploring potential shortage distributions, but municipal leaders emphasize that these assumptions remain preliminary and do not dictate the city’s exact share of future cuts.
Resilience and Diversified Water Supplies
Tucson receives Colorado River water via the Central Arizona Project, but the city does not depend on a single source. Decades of deliberate planning—including groundwater recharge, underground storage, and supply diversification—have positioned the community to manage future river reductions effectively. City Manager Tim Thomure stated that Tucson has planned for Colorado River uncertainty for decades through a diversified portfolio, noting that the city will carefully evaluate the federal proposal while safeguarding reliable customer service.
For local residents and businesses, the FEIS triggers no immediate modifications to water delivery, utility rates, service rules, or water-use mandates. Tucson Water will maintain operations under existing local plans while staff analyze the federal document. Customers are not required to take any action in response to the federal release, awaiting instead the final federal operating guidelines that will dictate actual reservoir releases and delivery reductions.
Regional Coordination and Next Steps
Municipal water authorities are coordinating closely with the Central Arizona Project, the Arizona Department of Water Resources, and other regional stakeholders to assess the operational and legal implications of the federal preferred alternative. Tucson Water Director John Kmiec described the proposal as an important step in shaping long-term river management, emphasizing that the department’s priority is understanding local impacts while supporting collaborative solutions.
Looking ahead, Tucson continues to prioritize long-term investments under its One Water 2100 Plan, which integrates population growth forecasts, drought preparedness, and Advanced Water Purification. Mayor Regina Romero underscored the critical importance of the Colorado River to regional economic vitality, affirming that the city will continue partnering with state, tribal, and federal entities to balance agricultural, environmental, and municipal needs.
Federal agencies will advance toward specific operating rules for 2027 and 2028 to dictate shortage distributions. Tucson Water supplies more than 750,000 people across the metropolitan area, maintaining that conservation, recharge, and advanced technology will secure local reliability while federal negotiations proceed.