Before any building permit can be issued in Costa Rica, you must demonstrate how your project will be supplied with potable water. Understanding which option applies to your property — and starting the process early — is one of the most important steps in your development timeline.
Water is not optional in Costa Rica — it is a mandatory permit prerequisite. The CFIA (Colegio Federado de Ingenieros y Arquitectos) will not process any building permit application without a confirmed water source. This means resolving your water situation must happen in parallel with, or even before, your design and permitting process.
For foreign investors and developers, the water situation in Costa Rica is often surprising. Public water infrastructure in Guanacaste and the Pacific Coast is not uniformly available — some areas are served by the national utility AyA, others by community cooperatives called ASADAs, and many rural, coastal, or mountainous properties have no public water connection at all. In those cases, a well is the solution.
There are three main water supply options for development projects in Costa Rica. Which one applies to your project depends on your location, your project type, and the capacity of available public infrastructure. Each option has a different process, timeline, cost, and suitability range.
The Carta de Agua (Official Water Availability Letter) is a certification issued by the entity responsible for water service in your area — either AyA (Instituto Costarricense de Acueductos y Alcantarillados, the national authority) or the local ASADA (community water cooperative) — confirming that potable water service is available at your property and that capacity exists to serve your project's demand.
This letter is the standard water solution for properties located within the service zone of an existing public water network. It is the simplest and fastest water solution when available.
AyA is the national authority serving most urban areas. In Guanacaste, AyA serves Liberia, Cañas, Santa Cruz, and parts of Playas del Coco. ASADAs are community-managed cooperatives that serve rural and beach communities not covered by AyA — including Nosara, Sámara, Playa Flamingo, Potrero, Tamarindo, Playa Ocotal, and many others. Each ASADA operates independently with its own capacity constraints and connection processes.
An Artesanal Well (Pozo Artesanal) is a shallow, manually-dug or hand-drilled well — typically less than 15 meters deep — drawing water from a near-surface aquifer. This type of well does not require a SENARA drilling permit or a formal water use concession, making it simpler and faster to establish than a drilled well.
However, artesanal wells are limited in scope and are generally only accepted for low-demand uses — primarily single residences in rural areas, small agricultural operations, or properties where the local aquifer is close to the surface and of sufficient quality.
A Drilled Well (Pozo Perforado) is a deep, mechanically-drilled well — typically 30 to 150+ meters — accessing deep aquifer systems that provide reliable, year-round water supply independent of the surface water table. This is the standard water solution for large-scale developments, remote properties, and any project where public water service is unavailable or insufficient.
This option involves two separate regulatory tracks: a drilling permit from SENARA (Sistema Nacional de Aguas Subterráneas, Riego y Avenamiento) and a formal water use concession from MINAE (Ministerio de Ambiente y Energía). Both must be obtained before the well can be used as the official water supply for a permitted project.
The MINAE water use concession grants the legal right to extract a specific volume of water per day from the well. It is registered in the national registry and runs with the property. Without an active concession, you cannot legally use the well as a potable supply source for a permitted building.
A quick-reference comparison of the three options — by project type, timeline, and complexity.
| Factor | Carta de Agua (AyA/ASADA) | Artesanal Well | Drilled Well + Concession |
|---|---|---|---|
| Typical timeline | 2–8 weeks | 4–8 weeks | 12–24 months |
| Single-family residence | ✓ Preferred | ✓ Accepted | ✓ Accepted |
| Condominium / Multifamily | ✓ If capacity available | ✗ Generally not accepted | ✓ Required if no public service |
| Hotel / Resort | ⚠ Depends on capacity | ✗ Not accepted | ✓ Standard solution |
| Master plan / Urban development | ⚠ Rarely sufficient | ✗ Not accepted | ✓ Required |
| Remote / rural property | ✗ Often unavailable | ✓ If shallow aquifer | ✓ Reliable solution |
| Requires SENARA involvement | No | No | Yes — drilling permit + concession |
| Required water quality testing | Not required (public system) | Bacteriological + chemical | Full bacteriological + chemical panel |
We have managed water approvals for 300+ projects across Guanacaste and the Pacific Coast — from urban ASADA connections to large-scale well concessions for master-planned developments. We can tell you exactly what your property needs and how long it will take.
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