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⚡ THIS WEEK'S SIGNAL
Interior's new two-year Colorado River plan sets Arizona's share of the cut at 760,000 acre-feet, assuming the states' own split holds. Ten days later, the attorney general asked for a data center pause. Researchers say data centers didn't cause the cut and, at the tap, are small against it. A sustainability nonprofit estimates their larger water footprint sits at the power plant, so waterless cooling is really a load problem. The water tab isn't shrinking. It's moving.
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📰 MAIN STORY
[Headline]
The river got smaller, and the argument got louder. On August 21, Interior finalized its 2027–2028 Colorado River guidelines, cutting Lower Basin deliveries by 1.25 million acre-feet in each of the next two years; if Arizona, California and Nevada adopt their proposed split, Arizona's share is 760,000 (Reclamation; an acre-foot is about 326,000 gallons). Ten days later, Attorney General Kris Mayes called for a pause on new data center approvals, and Governor Katie Hobbs rejected a statewide moratorium. The electric half of this fight ran in The Pledge Doesn't Set Your Rate. Here's What Does.: the Ratepayer Protection Pledge's five commitments cover power supply, grid upgrades, rate structures, jobs and resilience. None mentions water.
Interior is optimizing first for keeping Lake Powell at or above 3,510 feet, to protect Glen Canyon Dam. Arizona's cities are optimizing for their Assured Water Supply designations, which require proof of a 100-year supply and shape the large-user rules nine providers have adopted, Phoenix, Mesa and Tucson among them. Hobbs's office says it wants data centers to pay their fair share for water, without a moratorium. Microsoft, which operates data centers in Goodyear and El Mirage, wants water off the critical path: its designs since August 2024 use closed-loop cooling that avoids more than 125 million liters a year per site. Analysis: that sidesteps cooling-water caps and potable-water bans like Marana's, but Microsoft's own post says the swap raises energy use, though it calls the fleet-wide increase nominal.
Here is the contrast. A large user buying industrial-class water from a city with an assured supply pays on the order of $700 to $2,200 per acre-foot. A large user that pumps under a state general industrial groundwater permit pays $2.12 per acre-foot plus a $2.00 to $3.50 withdrawal fee: roughly $4 to $6 by our arithmetic, before pumping costs. State law directs that permit to issue if a city within three miles declines to serve on its customary terms and other requirements are met. That groundwater isn't replenished. The city prices the front door. As of the Kyl Center's September 2025 survey, the state priced the side door.
The numbers. Arizona's 760,000 acre-feet is roughly a 27% to 30% cut, per Cronkite News. Ceres, a sustainability nonprofit, estimated in September 2025 that Phoenix-area data centers use about 385 million gallons a year for cooling and 2.9 billion more through the electricity they consume, and projected 3.7 billion and 14.5 billion. The math illustrates that projected total is roughly 56,000 acre-feet: about 7% of the 2027 cut. Grist reports evidence those figures run high: Phoenix-area industrial use has been flat for years, and industrial use was about 6% of Mesa's potable water in 2024. The Arizona Department of Water Resources doesn't track use at most data centers, and companies aren't required to report it.
Scenario A: If Governor Gavin Newsom signs Assembly Bill 2469, which bars local approval of new or expanded data centers unless the developer discloses its water plans and pays the full cost of new pipes, treatment or storage, California writes cost-causation into the water entitlement, the principle large-load electric tariffs already apply. Infrastructure investors underwriting California sites carry a new up-front capital line; Santa Clara Valley Water District, which supported both bills, says more usage data would help it plan.
Scenario B: If he vetoes, as he did a near-identical disclosure bill last year, water reporting stays a company choice and city ordinances remain the operative rules. Hyperscalers keep reporting mostly globally, utilities keep planning against demand nobody must disclose, and the next venue is Arizona's 2027 session.
Watch September 30, the last day for Newsom to sign or veto Assembly Bills 2469 and 2619.
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🧾 DEAL DECODER
The instrument: a large-user water permit, a security deposit paid in water instead of dollars.
Who signs what. A large customer and the City of Mesa, under a permit granted through a Sustainable Water Service Application (Mesa City Code §§ 8-10-9 through 8-10-12, as summarized by ASU's Kyl Center in September 2025). Not a rate, not a water purchase: permission to exceed a demand ceiling of 330 acre-feet in a rolling 12 months for new customers.
Who fronts what. Within 90 days, the customer transfers long-term storage credits covering the approved allowance for at least three years, and keeps a three-year balance.
Who eats the loss. Analysis: not the city; supply arrives before demand does. The summary is silent on what happens to the credits if the project never energizes.
Precedent. Deliveries over 5% above the ceiling trigger higher billing rates and possible revocation; Phoenix and Tucson add recycled-water offsets and 120% use caps. The next city writes bring-your-own-supply into the entitlement step.
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⚡ QUICK HITS
Microsoft's zero-water Phoenix sites aren't online yet. Microsoft says every datacenter designed since August 2024 uses closed-loop cooling, with Phoenix-area pilots in 2026 and new sites coming online from late 2027, and in June it reported a 23% year-over-year water-efficiency gain at its existing Phoenix datacenters. The same design post says the swap nominally raises power use, so for utility planners the water saved arrives as electric load. Microsoft Cloud Blog Microsoft; Microsoft Blogs
APS's data center rate is a December story. APS is asking for more than a 45% increase for extra-large users like data centers and about 14% for households; a recommended order is expected in November and a commission vote likely in December. AZFamily reports Microsoft is contesting the proposal. Analysis: the design that saves water adds load, and this is where that load gets priced. Arizona Capitol Times APS rate case kicks off with hours of protest over 14% rate increase | Arizona Capitol Times +2
Newsom has two data center water bills to decide. Assembly Bill 2619 requires operators to report water sources and use under penalty of perjury when seeking or renewing a license or permit, and passed the Senate 30 to 9; AB 2469 conditions local approval on disclosed water plans and developer-paid pipes, treatment and storage. He vetoed a near-identical disclosure bill last year, and the League of California Cities and county associations opposed AB 2469 as of mid-August. CalMatters CalMatters
Phoenix attributes the higher water costs it expects to the river decision. The city says about 40% of its drinking water comes from the Colorado River through the Central Arizona Project and 58% from the Salt and Verde rivers, that no mandatory restrictions are required now, and that it will draw on stored water while seeking federal help with higher costs. Analysis: any increase would reach bills through the city's ordinary rate process; none has been announced. City of Phoenix phoenix
113 data center tax-break applications landed in the two weeks before Arizona's pause took effect. Hobbs signed a three-year pause on new data center tax breaks on June 13, effective June 30. Applications aren't approvals, so the incentive stack on those sites isn't settled, which matters to anyone underwriting an Arizona campus. AZ Luminaria AZ Luminaria
🧭 THE EXPOSURE MAP
If you hold equities. Analysis: this structure strengthens the closed-loop cooling supply chain and the generation and transmission serving added load, and pressures developers whose models treated water as a pass-through line. What would confirm or contradict it: the Arizona Corporation Commission vote on APS's extra-large-customer rate, expected in December, and Q3 hyperscaler commentary on cooling design. Companies named here are participants in the structure, not recommendations.
If you run projects at a utility. Water is now a dependency in a large-load package. Can you say, for each request in your queue, whether the water provider has confirmed supply and whether the cooling design changes the load in your study?
If you set or influence policy. The precedent in play: whether cost-causation extends from electrons to water pipes (AB 2469) and whether disclosure becomes a permit condition (AB 2619). Next venues: Newsom's September 30 decisions, the December APS vote, Arizona's 2027 session.
If you pay a utility bill or buy AI compute. Phoenix attributes its expected water-cost increase to the river decision; it would move through rates over quarters or years, and none is announced. APS households face a request of about 14%. Nothing in these filings reprices your AI tools this quarter. Phoenix, Arizona Capitol Times
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🔧 TOOL / RESOURCE OF THE WEEK
Kyl Center, How Arizona Municipal Water Providers Are Regulating Large-Volume Water Users: A September 2025 side-by-side of nine providers' large-user rules, with ceilings, offsets, penalties and ordinance citations. If you invest in or site Arizona campuses, it is the fastest free read on which city writes which rule, though check current ordinance text before relying on it. → morrisoninstitute.asu.edu
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💬 CLOSING THOUGHT
Cautious optimism, then. Nine Arizona water providers wrote their large-user terms into public code, unlike the nuclear floors we couldn't find in Two Contracts, 3 Gigawatts, and a Floor Nobody Has Read. For that to hold, someone has to publish the usage those rules govern, because the state doesn't track it today. Until then every side is arguing from an estimate.
Will disclosure arrive before the next reduction does? I think that's what a lot of us are waiting to see.
