On most agricultural real estate, water is worth more than the dirt it sits on. Two parcels with identical acreage, soil, and location can trade at wildly different prices depending on what water actually comes with the land — and how reliable that water is going forward. Acreage is fixed. Water is the variable that determines whether the property can actually grow what it's zoned to grow.
The three ways farmland gets water
Almost every parcel's water comes from some combination of these three sources, and each carries a different risk profile.
- Irrigation district water. Surface water delivered through a district (often originating from a reservoir or river system), sold under a contract or allocation. Look at the district's actual delivery history, not just the paper entitlement — allocations get cut in dry years, sometimes to zero.
- Groundwater via wells. Pumped from an aquifer on or near the property. Capacity is measured in gallons per minute (GPM); reliability depends on the depth to water table and how that table has trended over time.
- Riparian or appropriative rights. Riparian rights attach to land that borders a natural watercourse and don't require a permit in most contexts, but usage can be shared among all riparian landowners on that watercourse. Appropriative rights are permitted and dated — in California, they follow a first-in-time, first-in-right doctrine, so a senior priority date is worth real money.
Why SGMA changed the diligence checklist
California's Sustainable Groundwater Management Act (SGMA), passed in 2014, put groundwater basins statewide under local Groundwater Sustainability Agencies (GSAs), each required to adopt a Groundwater Sustainability Plan (GSP) and bring the basin into balance over a multi-decade timeline. For basins already designated critically overdrafted, that means pumping allocations are being phased down — in some cases significantly — as the 2020s and 2030s progress.
This is not a theoretical risk. A well that pumps freely today may sit inside a basin with an adopted GSP that caps or reduces allocations on a defined schedule. Buyers of well-dependent land now need to know which basin the parcel sits in, that basin's priority classification, and whether the GSP already has an allocation or fee structure that applies to this specific property.
What to request before you make an offer
- District water contract and the last 5 years of actual delivered acre-feet — not the paper allocation.
- Well completion reports and pump test results, available from the state or county well records, plus historical static water level readings if the seller has them.
- The parcel's groundwater basin and GSA, that basin's priority designation, and whether a GSP already imposes pumping limits or fees on this property.
- Recent water quality testing — salinity and nitrate levels matter enormously for tree crops and vineyards, less so for some row crops and pasture.
Red flags worth pausing on
- An allocation that looks generous on paper but has never been fully delivered in practice — sometimes called "paper water."
- Static water levels in well logs that have trended meaningfully downward over several years.
- Land in a critically overdrafted subbasin with no clear compliance path in the adopted GSP.
- Water rights that aren't clearly conveyed with title — some ag water rights are severable and can be sold separately from the land itself.
None of this replaces a real water attorney or engineer for a specific transaction — but knowing what to ask for, and reading it with real skepticism, is most of the battle.
On Aguisitions
Water district, well count, and irrigation type are surfaced on every listing.
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