When a Market Runs Out of Water: Development Moratoria and What They Signal

This is Climate-Ready Real Estate Investing, the intelligence briefing for stakeholders in the nearly $400,000,000,000,000 global real estate market, the world's largest asset class. The goal is to provide you with the intelligent signals to be profitable today while ensuring we will have a tomorrow. Listen, then implement to do good things and make money. I'm your host, Jamie Wolf. Climate-Ready Real Estate Investing delivers weekly market intelligence, deal strategy, and forward looking analysis for professionals navigating a $393,000,000,000,000 industry at a turning point, guided by the belief that profitable decisions and responsible ones don't have to be mutually exclusive.

Welcome to today's market intelligence brief. I'm your host, Jamie Wolfe. This month, we continue to examine climate risk in the context of supply chain and building innovation because builders and suppliers are market makers. In Friday's brief, Valencia shows what happens to developers when a market gets too much water at once. Today, we get the mirror image.

What happens to builders and suppliers when a market runs out of water and the permit office, not the rain, becomes the constraint? Water availability, not demand, not capital, is becoming the binding constraint on where a market can build. In a nearly $400,000,000,000,000 global real estate market, the most dire example is in America's fastest growing desert metro. Phoenix matters precisely because it isn't coastal and it isn't on fire. It's the boontown, the place capital is treated as a sure thing for more than two decades.

When the binding constraint on a growth market turns out to be a molecule of water rather than a unit of demand, every model that assumed build it and they will come has to add a line it never had. Can you legally deliver water to the door? That's the signal. Not drought as weather, but water as entitlement. On 06/01/2023, the ADWR, the Arizona Department of Water Resources, released an updated groundwater model for the Phoenix Active Management Area, the AMA, that projected that the Phoenix Area aquifer could no longer provide the hundred year assured supply required by Arizona's 1980 groundwater management act.

It stopped issuing certificates to groundwater reliant developers across the Phoenix AMA, halting new home construction across large portions of Maricopa County. That was not a finding that Phoenix is out of water. The city relies on a diversified water portfolio, including the Salt And Verde Rivers, groundwater, and the Colorado River. Still, residents and businesses are facing stricter conservation limits and higher costs due to the severe drought affecting the Colorado River. It was, however, a finding that about four percent of projected demand over a hundred years couldn't be met by groundwater alone, so new growth can't rely solely on pumping.

The hundred year rule is worth understanding because it's what makes Arizona a leading indicator for the rest of the country. Under the 1980 Groundwater Management Act, a developer within an active management area cannot simply drill a well and build. They must demonstrate a hundred years of assured supply before lots can be sold. Most states have no such test today. So when Arizona's own model says that the assurance no longer holds for groundwater only growth, it isn't a local quirk.

It's a preview of the question every water stressed jurisdiction will eventually have to answer. The freeze hit the outer ring of Metro Phoenix hardest, Buckeye and Queen Creek, because their growth was underwritten on groundwater that could no longer be certified. Hundreds of thousands of planned homes were suddenly in question. Put yourself in the developer's shoes on a frozen parcel. The land was bought, entitled, and financed on the assumption that certificates would issue on schedule.

Overnight, the most important number on the deal isn't the cap rate or the rent comp. It's a regulatory finding about an aquifer. Carrying costs keep running. The lender's clock keeps ticking, and the exit assumes a buyer who can actually build. A freeze doesn't just delay a project.

It can strand the entire basis. November 2024, ADWR released a new model in which it began applying two new standards when reviewing certificate applications, the AMA wide unmet demand rule and the AMA wide depth to water rule. For years before this change, developers could satisfy a certificate requirement through a site specific hydrologic study focused on a single well point within their proposed development area. ADWR also finalized the alternative path to designation of assured water supply, ADOS program, which allowed bypassing rigid groundwater restrictions if at least 25% of groundwater usage came from renewable alternative sources like effluent or treated wastewater so that new housing developments could proceed. Concurrently, the state pursued other avenues such as the legislative ag to urban program, which streamlined the process of converting high water agricultural rights into urban development credits.

These alternative water designations reenable the development of roughly 60,000 homes by converting retired farmland water and bringing in a nongroundwater supply. That's the birth of a market. When groundwater alone won't certify a project, the missing supply has to come from somewhere, retired agricultural water, treated effluent, recharge credits, and each of those is now a tradable input with a price. The ADOS path 25% renewable threshold is essentially a regulator saying, bring enough nongroundwater to the table, and you can proceed. For developers, that turns water from a site condition into something you assemble, like a capital stack.

And for everyone holding land on the groundwater only edge, it's a new cost they never underwrote. The Home Builders Association of Central Arizona, HBACA, launched and won several lawsuits against ADWR, effectively blocking the AMA wide restrictions and the ADOS program, claiming that the latter effectively functioned as a tax on developers. The fight is not over. ADWR plans to appeal backed by governor Katie Hobbs administration arguing that Arizona's long term water security is threatened. For now, groundwater based subdivision development is back on.

Notice what the litigation itself does devalue. When the rule can flip from frozen to open and back again on a court schedule, the entitlement carries a political and legal risk premium on top of the hydrology, the kind of uncertainty that widens cap rates and shrinks the buyer pool because no institutional buyer wants to underwrite a parcel whose right to build is still being argued in court. The signal isn't Phoenix stopped building. It's that water availability is now both gate and a political battleground, and the assured supply certificate has become the most contested document in the deal. For the historical bookend, look at a major global city far from Arizona.

In 2017 and 2018, Cape Town, a metro area of almost 4,000,000 inhabitants at the time, came within weeks of day zero, shutting off municipal taps before emergency rationing averted it. Day zero was averted, but the near miss permanently changed how water stressed cities price growth. It's happened before. It can happen again anywhere. There is ongoing stress between water supply and demand, money to be made, and elections to be won.

The lesson from Cape Town isn't that the taps ran dry, they didn't, but how quickly behavior and values changed at the mere threat. Within a single dry season, water moved from background utility to the central variable in every household and business decision in the city. Markets reprice risk fastest when a near miss makes the previously unthinkable suddenly concrete. There are four implications affected by three signals. Signal seven, water stress and allocation, signal nine, local policy zoning and building codes, and signal 10, migration, labor, and demographic flows.

First, the certificate is the asset. Signal seven, a one hundred year assured supply test turns hydrology into entitlement risk. On a groundwater only parcel, the binding question isn't price or zoning. It's whether the water can be certified at all. Second, water is the new permit.

Signal nine. A water designation now gates approval in the alternative water market, recharge credits, effluent reuse, retired ag transfers is becoming the deal making layer. Where Arizona goes, other drought stressed jurisdictions are watching. Third, water redistributes people, signal 10. When water caps growth at the edge, household formation, labor, and demand migrate toward assured supply, submarkets, and infill.

That's a slow migration signal that reprices land long before it shows up in permits. And fourth, the capital implication, land banks sitting on groundwater only edges carry stranded entitlement risk, while parcels with an assured supply designation trade at a premium over identical parcels without one. Step outside Phoenix, and the pattern generalizes fast. Texas groundwater conservation districts, California sustainable groundwater management act, and stressed basins across the Mountain West are all moving at different speeds toward the same place, proof of supply as a condition of development. The investor who learns to read a water designation the way they already read a flood zone or a zoning map will be the one who isn't surprised when the next desirable submarket quietly stops issuing permits.

The next shift to monitor is the move from assured water to an explicitly priced tradable input. Expect water portfolios, recharge credits, effluent reuse rights, alternative water designations underwritten right alongside the dirt, and expect more jurisdictions to adopt assured supply tests as droughts deepen. In other words, watch for water and land prices to start moving together. Today, they're underwritten separately. Water is a utility question.

Land is a real estate question. But in a market where a parcel without assured supply may never be buildable, the water right and the dirt converge into one asset with one value. The parcel with a water designation will simply be a different asset from the one without. The first markets to price that convergence explicitly are the ones where Smart Capital is already quietly buying the assured supply parcels and discounting the rest. The takeaway for investors and developers?

Underwrite the water right, not just the dirt. In water stressed metros, the assured supply certificate is the entitlement that makes or breaks the deal and increasingly the most valuable line on the parcel. This brief ships with a Climate Ready Deal Framework signal tracker built on these exact observations so that you can log the water code and migration signals in your own markets. And remember, the underlying framework, the signals, line items, the scenario logic doesn't expire with the data. The tool is designed to be populated with your current numbers.

The framework is the durable part. If water decides whether you can build at all, the next question is what to spend on what's already standing. Next up on Wednesday is episode 29, a strategy and underwriting brief titled retrofit economics when hardening pencils. Be sure to be there. I ask the same question at the end of every show because if you could look forward ten years and bring that insight into your assumptions in 2026, how would knowing those results inform your decisions today?

Where would you build? When would you secure water rights? How would you price acquisitions so as not to get left holding a stranded asset? In this case, land ready to develop until an entity says otherwise. The work we do in these briefs should alert you to foreseeable issues before they become your downfall.

That wraps it up for today. Be sure to subscribe to Climate Ready Real Estate Investing to receive free downloads for our market intelligence and strategy and underwriting briefs. Listen to the podcast and find us on Twitter and LinkedIn. If you'd like to be a guest on the show, you can register at climatereadyre.com, the place where resilient returns and resilient communities meet. Until next time, I'm your host, Jamie Wolfe.

Be good and do better for today, tomorrow, for you, and for all. Know your signals and be climate ready. This has been the intelligence briefing on Climate Ready Real Estate Investing, where we explore climate through a financial lens to achieve resilient returns and resilient communities. Find us on LinkedIn and Twitter. To get the Climate Ready Deal Framework to help you reevaluate your deals, go to climatereadyre.com, enter your email address, then check your inbox.

See you next time. Climate Ready Real Estate Investing is an independent intelligence briefing. We synthesize publicly available research, industry reporting, and data, sometimes with the help of AI enabled analytical tools, into commentary and analysis on the trends shaping real estate, climate risk, and the long term durability of communities. Nothing in this program is investment, financial, legal, tax, or other professional advice. Always do your own due diligence and consult qualified professionals before making decisions.