New Rules Impacting Development in Overdrafted Basins
New regulations on groundwater are changing the rules for developers. Are you prepared for the impact? #Infrastructure #GroundwaterRegulation
California is running out of water it never had. For decades, agricultural operations, municipalities, and developers across the state have drawn from underground aquifers faster than rainfall and snowmelt can replenish them — a condition called overdraft. Now, proposed regulations would prohibit new development in overdrafted groundwater basins outright, unless the state grants specific approval. For anyone with infrastructure projects planned in the San Joaquin Valley or similar regions, that's not a footnote; it's a fundamental threat to the project timeline, the pro forma, and, in some cases, the project itself.
Understanding Overdrafted Groundwater Basins
Groundwater overdraft happens when cumulative withdrawals exceed cumulative recharge over time. Think of it like a bank account where you spend more than you deposit every single month. The balance eventually hits zero — except with aquifers, the consequences are harder to reverse than an overdrawn checking account.
When an aquifer is depleted, the land above it can literally collapse — a process called subsidence — damaging roads, pipelines, and building foundations in ways that cost billions to repair. In some parts of the San Joaquin Valley, the land has sunk more than 28 feet over the past century due to groundwater extraction. That's not a gradual inconvenience; that's an infrastructure catastrophe unfolding in slow motion.
California's Sustainable Groundwater Management Act (SGMA), passed in 2014, was supposed to fix this by requiring local groundwater sustainability agencies to develop plans bringing critically overdrafted basins into balance by 2040. But implementation has been uneven, timelines are slipping, and some of the state's most critical agricultural and industrial regions — particularly in the San Joaquin Valley — remain severely overdrafted. The proposed new rules represent a harder line: if your basin is overdrafted, development stops until it isn't.
New Regulations: What You Need to Know
The proposed rules would establish a direct prohibition on new development in overdrafted groundwater basins unless the state signs off on an exception. The mechanism is blunt by design. Rather than layering additional reporting requirements onto developers or asking local agencies to self-police, the regulation creates a hard gate at the front end of the development process.
What makes this particularly significant is the geography it targets. The San Joaquin Valley sits atop some of the most stressed aquifer systems in the United States. It's also home to massive agricultural infrastructure, food processing facilities, logistics hubs, and increasingly, proposed renewable energy projects and data center campuses — all of which have substantial water demands or require construction activity dependent on water availability.
The state exception process remains undefined enough that developers cannot yet model it reliably into their timelines — and in infrastructure development, uncertainty about a regulatory approval is often more damaging than the regulation itself.
For solar and battery storage developers specifically, the implications are non-obvious. Utility-scale solar requires relatively minimal operational water, but construction grading, dust suppression, and concrete work for foundations all have water demands. If a project sits within a designated overdrafted basin boundary, the construction phase alone may trigger review.
Impact on Infrastructure Development
The first-order impact is delay. Any project in the permitting queue within an overdrafted basin will face additional regulatory review layers before breaking ground. For developers accustomed to California's already complex entitlement process, adding a state-level groundwater exception requirement isn't a minor paperwork burden — it can add months or years to a project schedule.
The second-order impact is capital cost. Lenders and tax equity investors price regulatory risk. A project with a cloud over its groundwater status will carry a higher cost of capital than a comparable project outside an overdrafted zone, all else being equal. For infrastructure deals operating on thin IRR margins, that spread matters.
There's also a site selection ripple effect that the industry hasn't fully priced in yet. Developers who previously filtered sites primarily on grid interconnection, land cost, and solar resource will now need to add basin overdraft status as an early-stage screening criterion — before spending money on environmental studies or interconnection applications. Those who don't build this into their acquisition process will find themselves holding optioned land that can't be developed on any reasonable timeline.
The San Joaquin Valley bears the heaviest concentration of risk here. It's one of the few regions in California where large contiguous parcels of affordable land are still available for utility-scale infrastructure — and it's precisely where overdraft conditions are most severe. That's not a coincidence; it's a reflection of decades of intensive agricultural water use that developers are now inheriting as a site condition.
Mitigation Strategies for Developers
The developers who navigate this well won't be the ones with the best lawyers. They'll be the ones who understand groundwater hydrology well enough to engage substantively with local Groundwater Sustainability Agencies (GSAs) early and often.
A few practical approaches are already emerging:
Partnering with GSAs before submitting formal development applications can help project teams understand whether a proposed project can be structured to avoid triggering the prohibition — or qualify for an exception. GSAs have statutory authority and local knowledge; developers who treat them as adversaries rather than technical partners tend to discover that late.
Water-neutral development frameworks are gaining traction as a compliance strategy. The concept is straightforward: a developer offsets the water demand of a new project by funding aquifer recharge, retiring existing agricultural water rights, or financing efficiency upgrades that reduce overall basin withdrawals by an equivalent volume. Whether the state will accept this as a basis for granting exceptions under the new rules remains to be seen — but it aligns with the underlying policy logic.
For data center and industrial developers, passive cooling designs and air-cooled systems eliminate the water intensity that would otherwise make a project a harder case under groundwater restrictions. These design choices, once driven purely by operating cost, now carry regulatory weight as well.
Site selection discipline is the cheapest mitigation. Groundwater basin boundaries and overdraft designations are publicly available through the California Department of Water Resources. Running a proposed site against that data before any capital commitment costs nothing. Not doing it can cost everything.
Future Outlook: Navigating Groundwater Challenges
The proposed prohibition on development in overdrafted groundwater basins isn't the end of this regulatory cycle — it's closer to the beginning. SGMA's 2040 compliance deadline means that basins currently categorized as critically overdrafted will face escalating state intervention over the next 15 years, including potential state takeovers of local groundwater management. Each intervention point is an opportunity for new restrictions to attach.
The developers best positioned for the next decade are those building groundwater literacy into their site acquisition teams now, not treating it as a due diligence afterthought to be handled at closing.
There's a contrarian read worth considering: tighter development restrictions in overdrafted basins could actually increase the value of entitled land in basins with healthier groundwater balances. If the supply of developable land in California's interior effectively shrinks, projects already permitted in compliant basins become comparatively more valuable. Sellers of those assets will benefit. Buyers should model accordingly.
For investors and developers tracking infrastructure opportunities through marketplaces and deal flow networks, basin overdraft status is now a material site characteristic — the same way flood zone designation or seismic risk has always been. The regulatory framework is making it official. The market will catch up.
Explore more about how these changes impact your projects and find opportunities in the InfraSale Marketplace here.