Water due diligence often starts with a question that sounds simple: how much water is available? A utility may hold contractual rights to millions of gallons, a water district may carry federal contracts extending indefinitely, a manufacturing site may hold permits sufficient for planned production, and a supplier may have operated for decades without a meaningful interruption. None of that necessarily establishes how much water will be available during the conditions in which a company is most likely to need protection, and California's Central Valley Project offers an unusually clear example of the gap.
Earlier this week, the Ninth Circuit strengthened the contractual position of water districts holding converted federal repayment contracts covering nearly 3 million acre-feet of annual water supply, contracts that can now continue indefinitely as long as required payments are made. But the court was equally clear about something else: the water itself remains subject to availability. That distinction creates two numbers with very different implications for corporate risk. One measures how much water an organization has a right to receive. The other measures how much it can reasonably expect when the system is under stress, and for capital planning, the second number tends to matter more.
A Contract Can Survive When the Water Does Not Arrive
The distinction is already visible in California. The Central Valley Project's contracts establish rights and obligations between the federal government and individual water districts, but they do not guarantee full annual delivery. For 2026, Reclamation initially allocated only 15% of contract totals to south-of-Delta agricultural water-service and repayment contractors, while north-of-Delta irrigation and municipal and industrial contractors received 100%. Improving conditions later allowed that south-of-Delta figure to climb to 20%, then 25%, then 28% by mid-August. The underlying contracts never changed; the available water did.
A company reviewing a supplier's water position might see a long-term contract for a particular volume and classify the supply as secure, but if the relevant system historically delivers a fraction of that volume during constrained periods, contractual volume alone provides an incomplete picture of operational exposure. The same principle holds outside California and outside federally managed water systems entirely.
Site Selection Often Measures Capacity Instead of Reliability
Energy-intensive projects have already learned a version of this lesson with electricity. A prospective site can sit beside transmission infrastructure and technically have access to a utility system while facing years of interconnection delays or insufficient firm capacity. Water deserves the same scrutiny, because a utility's stated capacity does not necessarily answer what happens during drought, competing demand, groundwater restrictions, environmental flow requirements or infrastructure failures. For a semiconductor facility, food processor, pharmaceutical plant, data center or other water-dependent operation, those distinctions can alter a site's underlying economics.
The relevant underwriting question is not whether the utility can serve the facility on paper. It is what supply remains available, at the project's expected demand, during the conditions that actually constrain the system. A site with lower nominal water availability but multiple independent sources, significant storage and established drought-management protocols may ultimately carry less operational risk than one advertising far more capacity drawn from a single stressed source.
Acquisitions Can Inherit Exposure That Never Appears on the Balance Sheet
The same problem shows up in M&A. A buyer evaluating an industrial asset will typically review permits, utility agreements, environmental liabilities and operating expenses, but water reliability tends to sit awkwardly between those categories. The facility may be fully permitted, its utility bills may show no unusual costs, and its supplier may have delivered water without interruption, yet the physical system supporting that facility can still contain constraints that only become material after the deal closes, in ways that resemble how undisclosed environmental exposures already quietly reshape coverage and liability after a transaction.
That raises a diligence question similar to the one the Ninth Circuit's ruling highlights. The converted contracts at issue in that case changed payment structure and duration, not maximum water quantities or delivery terms, which means stronger contractual durability does not automatically change the physical resource underlying the agreement. A buyer looking only at contract duration could come away with a materially different risk assessment than one examining actual allocation history.
Supply Chains Add Another Layer
For companies dependent on agricultural commodities, water exposure can sit several tiers away from the corporate balance sheet. A manufacturer may have no direct relationship with a federal water agency or irrigation district, but its growers do, which makes water diligence partly a procurement exercise. A food company sourcing ingredients from California's Central Valley needs to understand more than whether growers hold water rights; it matters whether those growers depend on federal surface water, groundwater, multiple sources or supplemental purchases during dry years, distinctions that are moving from a sustainability concern into core procurement and resilience planning across agricultural supply chains. Those differences eventually surface as changes in crop availability, supplier pricing and procurement concentration, and they explain why water risk cannot be reduced to a single corporate consumption number: the water used inside a processing facility may be measurable down to the gallon while the more consequential exposure sits hundreds of miles upstream in agricultural production, often invisible until a full supply-chain mapping exercise forces it into view.
Legal Security Is Not the Same as Physical Availability
Monday's ruling is useful because it separates two issues that are easy to combine. The Ninth Circuit held that Reclamation does not have to conduct contract-specific environmental review when converting qualifying water-service contracts into repayment contracts under the WIIN Act, because Congress made those conversions mandatory and barred Reclamation from modifying unrelated water rights in the process. That increases certainty around the contracts. It does not remove environmental constraints from operation of the water system, and the court explicitly noted that deliveries under the converted contracts remain subject to the environmental impact statements and biological opinions governing the project. Legal security, infrastructure capacity, regulatory permission and physical availability are different layers of water risk, and companies assessing exposure should resist letting any single layer stand in for the others.
Finance Needs a Reliable-Water Number
A more useful diligence process puts contracted supply beside a second figure: reliable supply under constrained conditions. Getting there takes more than reading a utility agreement. It means examining historical allocations or restrictions, source concentration, storage, competing demands, drought plans, groundwater dependence, infrastructure constraints and the thresholds at which customers begin facing curtailment, then asking the financial question that follows: if reliable supply falls below operational demand, what happens? Production could decline, alternative water might need to be purchased, a facility could require additional storage, recycling or treatment infrastructure, agricultural inputs could become more expensive, or expansion plans could stall without a second source.
Those consequences can be modeled, and once they are, water stops being a sustainability metric and becomes something finance can evaluate alongside power availability, transportation capacity and other infrastructure dependencies. The Ninth Circuit has made one part of California's water equation clearer by strengthening the distinction between contract conversion and actual water delivery. Corporate due diligence should draw the same line: knowing how much water a company has on paper is useful, but knowing how much remains when the system is under pressure is what tells executives whether the operation can keep running.
