By Eric Engelbert
If you have heard talk of a desalination plant near Doheny State Beach, it is not a rumor. The Doheny Ocean Desalination Project is a real, approved, and funded project in Dana Point, now in active development. When it comes online, it will turn seawater into drinking water for South Orange County, and it is designed to do it in a way that is far gentler on the coast than the ocean-intake plants that have drawn opposition elsewhere in California.
Here is what is being built, how it works, when to expect it, and why it matters for anyone who owns or is buying a home in South County.
What Is Being Built
The project is led by the South Coast Water District on a site in Dana Point, just north of Pacific Coast Highway and east of San Juan Creek, with access off Stonehill Drive. The plant is designed to produce about 5 million gallons of drinking water per day, roughly 5,600 acre-feet per year, at an estimated cost of around $140 million.
In late 2024, the district awarded the design, build, and operate contract to a team led by ACCIONA with J.R. Filanc Construction, with ACCIONA set to run the plant for about 15 years after it is finished. In other words, this moved past the study-and-approval phase and into the hands of a builder-operator, which is a meaningful step for a project of this kind.
| Project | Doheny Ocean Desalination Project |
|---|---|
| Lead agency | South Coast Water District |
| Location | Dana Point, near Doheny State Beach (north of PCH, off Stonehill Drive) |
| Capacity | About 5 million gallons per day (around 5,600 acre-feet per year) |
| Estimated cost | Roughly $140 million |
| Design-build-operate team | ACCIONA with J.R. Filanc Construction (Hazen on design) |
| Intake | Subsurface slant wells beneath Doheny State Beach |
| Expected water production | Around 2028 (subject to change) |
Why This Plant Is Different: Slant Wells, Not an Ocean Pipe
The detail that sets Doheny apart is how it takes in seawater. Instead of a large open-ocean intake pipe, the project uses subsurface slant wells drilled at an angle and buried beneath the ocean floor at Doheny State Beach. Seawater is pulled up through the sand, which acts as a natural filter before the water ever reaches the plant.
That design matters for two reasons. First, it is much easier on marine life, because fish, larvae, and other organisms are not sucked into an open intake the way they are with older designs. Second, it is a big part of why Doheny advanced through environmental review and Coastal Commission approval relatively smoothly, while the proposed open-intake plant in Huntington Beach was ultimately rejected. After treatment through reverse osmosis, leftover brine is blended with treated wastewater and released through an existing outfall pipe about two miles offshore, rather than as concentrated discharge.
Who It Serves and Why It Matters
The plant is built to give South Orange County a local, drought-proof water supply. Today, much of the region's water is imported from Northern California and the Colorado River, sources that are vulnerable to drought, legal cutbacks, and price increases. A locally controlled supply at Doheny reduces that dependence for South Coast Water District customers and the surrounding South County area, including communities in and around Dana Point, San Clemente, and San Juan Capistrano.
The project also attracted outside funding that reflects its regional value. Through a Local Resources Program agreement with the Metropolitan Water District of Southern California, South Coast stands to receive up to roughly $39.9 million in incentive payments over 15 years tied to the water the plant actually produces, which helps offset the cost to local ratepayers.
What It Means for South County Homeowners and Buyers
Water security is not the first thing most buyers ask about, but it is quietly one of the most important long-term factors in coastal California. Drought restrictions, watering limits, and rising water bills are real costs and real frustrations. A community with its own drought-resistant supply has a genuine long-term advantage, and that is exactly what Doheny is designed to provide for South Orange County.
For owners, infrastructure like this supports the long-term desirability and resilience of the area. For buyers weighing South County against other markets, a locally controlled water source is a point in the region's favor that most of California cannot claim. It will not move prices on its own, but it is part of the larger picture of why this stretch of coast remains one of the most sought-after places to live in the state.
Where Things Stand and What Comes Next
The Doheny project has its major approvals, including from the California Coastal Commission, has a funding agreement in place, and has a design-build-operate team on board. It remains in active permitting and construction planning, and the South Coast Water District has targeted water production around 2028. As with any project of this size, the exact construction and completion dates have shifted over the years, so treat 2028 as a target rather than a guarantee, and expect the timeline to firm up as construction progresses.
Doheny is one of several big changes reshaping South Orange County. For more on development and real estate across the county, see our New Developments in Orange County page.
Thinking About Buying or Selling in South Orange County?
Dana Point, San Clemente, and San Juan Capistrano are among the most desirable coastal markets in California, and projects like Doheny only strengthen the case for South County. Whether you are buying, selling, or just want to understand how the area is changing, we can help you make a smart, informed move.
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