A buyer looking at land in Sardinal this year can find two lots that read almost identically on paper. Similar size, a short inland drive from the beach, the same rolling dry-forest topography that makes this stretch of Guanacaste appealing to people building their first Costa Rica home. Yet one lot lists for meaningfully more than the other, sometimes by six figures, and nothing in the listing photos explains the gap.
The explanation is almost never the view, the road, or the neighbors. It's a piece of paper called a water letter, and specifically whether the community water association serving that exact parcel is still allowed to issue one.
What a Water Letter Actually Confirms
In Costa Rica, a water letter is a certification of service availability for public drinking water, issued either by AyA, the national aqueduct institute, or by a local ASADA, a community association that manages and controls water resources in rural areas under AyA's authorization. Without that letter, a municipality will not issue a building permit, no matter how much a buyer paid for the land or how good the location looks in person. It is not a formality that gets sorted out later. It is a gate that either opens or doesn't, and increasingly in Guanacaste, some gates are staying shut.
That distinction, between a lot with an active water letter and a lot without one, is what actually separates the two Sardinal parcels in the example above. It has nothing to do with proximity to the sand.
The Study That Changed the Math in Sardinal
A recent study of coastal water infrastructure in Guanacaste found that 17 community water associations in Sardinal, the district where Playas del Coco itself sits, no longer have the technical capacity to issue new water permits for private development. The same study flagged the same problem in Tamarindo, Tempate, and Cabo Velas. In plain terms, construction growth in these specific areas has already outpaced what the existing water network can support, and that's a fact tied to Coco's own district, not some distant part of the province.
This isn't new pressure building slowly. It's the accumulation of two decades of hotel, condominium, and second-home construction running ahead of the aqueducts built to serve it, a pattern that shows up across Guanacaste's coastal systems and that some can no longer resolve simply by adding more connections. A few systems can still expand, but only through infrastructure investment the developer has to fund directly. Most can't expand at all right now.
Why the Current Boom Makes This Sharper, Not Softer
Coco is not slowing down while this plays out. Construction is underway at Playa Penca for the Waldorf Astoria Residences Costa Rica Punta Cacique, a cliffside project between Playas del Coco and Playa Hermosa that has already sold through its first condominium building and is now selling estate homes priced from around $2.8 million. A short distance away, a $24.5 million marina project in Playas del Coco broke ground after years of planning, the kind of infrastructure that tends to pull retail, dining, and residential demand toward it for years afterward. Down the coast at Peninsula Papagayo, the Ritz-Carlton Reserve property Nekajui opened in March 2025, adding another five-star anchor to the northern Gold Coast.
Every one of those projects adds pressure to the same water systems that a coastal infrastructure study just flagged as constrained. None of them adds new aqueduct capacity on its own. That's the part of the boom that doesn't show up in a brochure. Demand for buildable land in Coco, Ocotal, and Sardinal keeps climbing. The water supporting that land does not scale at the same speed, and in several ASADAs it isn't scaling at all right now.
How This Plays Out Differently Across Coco's Own Neighborhoods
The friction doesn't land evenly. Central Playas del Coco, the older, walkable core near the beach and the town's restaurants and dive shops, largely runs on connections established years ago, so many existing homes and lots there already have service in place. The risk concentrates more in newer development, especially inland growth nodes like Coco Bay Estates and the Tres Volcanos area of Sardinal, where fresh subdivisions depend on newer ASADA connections that are exactly the kind now caught in the capacity freeze. Ocotal's hillside communities, prized for their ocean views, sit somewhere in between, with service history that varies lot by lot depending on when each parcel was subdivided and connected.
That means a buyer can't treat "Playas del Coco" as one market with one water story. The real question is parcel-specific: which ASADA serves this exact lot, and what is that association's current status with AyA.
What to Verify Before Any Deposit Changes Hands
Every water letter has an issue date, and an old one is not the same as a current one. Before signing a purchase option on land in Coco, Ocotal, or anywhere in Sardinal, a buyer or their attorney should confirm:
- The issue date on the water letter, not just its existence
- Which entity issued it, AyA or a named local ASADA
- Whether that system is currently accepting new connections, not just whether it served this lot in the past
- If the plan involves a private well instead, the concession number and its current status, since new wells are restricted or banned outright in much of Guanacaste
If the seller can't produce clean, recent documentation for any of these, the standard advice from due diligence practitioners across Costa Rica applies here too: treat that gap as the finding, not as a technicality to smooth over during closing.
The Reinstatement Path Exists, But It Moves Slowly
A frozen ASADA isn't necessarily frozen forever. The ASADA serving Playas de Nosara, several hours south of Coco, spent years under an AyA-imposed moratorium before completing the pumping tests needed to prove its wells could support both existing customers and future growth. AyA lifted that suspension in March 2022, and construction requests in the area picked back up within months. The path back to issuing letters exists. It just runs through expensive technical studies, well testing, and a timeline that Water League representatives in Guanacaste have described as taking many months at best, sometimes considerably longer.
That history matters for anyone comparing a cheaper, water-constrained lot to a pricier one with an active letter. The discount on the constrained lot might make sense as a long-term bet if the local ASADA is actively working through reinstatement. It's a much riskier bet if that association hasn't started the process, or has quietly stalled partway through it.
The Comparison That Actually Matters
Two lots in Sardinal can look the same from the road and price hundreds of thousands of dollars apart, and the gap has nothing to do with which one sits closer to the water. It has to do with which water system sits underneath it. In a district where a recent study counted 17 ASADAs no longer able to issue new permits, alongside similar constraints in Tamarindo, Tempate, and Cabo Velas, that single administrative fact is doing more to set real land values in Coco right now than the view, the road frontage, or the square footage combined.
A Few Questions Buyers Ask Early
Can I just drill my own well if the ASADA can't connect me? In most of Guanacaste, no. Authorities typically refuse new private wells in this province because groundwater is treated as a limited resource, and a well concession, when one is even possible, requires its own lengthy approval process through SENARA, the national groundwater and irrigation authority.
Does a water letter expire? Not automatically, but it isn't guaranteed to last forever either. Some letters carry a specific validity period, and all of them remain tied to the issuing system's actual capacity, which is exactly what's now being reassessed across Sardinal and neighboring districts.
If a lot doesn't have water now, does that mean it's worthless? No, but it changes what the lot is for. Larger parcels, roughly 5,000 square meters or more, are often treated as agricultural land that can be used and sold without utilities, just not built on as a residence until service is documented.
The lots that hold their value in this market are the ones where someone has already done the work of confirming which system serves them and whether that system is still open for business. That's a harder thing to judge from a listing photo than a view or a lot line, which is exactly why it's worth having someone local walk the paperwork with you before an offer goes in.
If you're comparing land or homes across Playas del Coco, Ocotal, or Sardinal and want a clear read on where a specific parcel actually stands, the advisors at Engel & Völkers Costa Rica work these micro-markets directly and can help you separate the lots worth pursuing from the ones that only look that way in the listing.
