"In many cases we don't know where the wastewater comes from, because it's a tangle, it's like a labyrinth, what there is in Tamarindo." Warren Chavarría, director of the Ministry of Health's Área Rectora de Salud in Santa Cruz, said that to Voz de Guanacaste in May 2021. The same article gave buyers a date to plan around. AyA's schedule said the public sanitary sewer that would end the problem would arrive in 2026.
It is now late 2026, and the sewer has not arrived. Based on AyA's own records, it is not close. That changes what a condo purchase in Tamarindo includes. Until a public network exists, every building handles its own wastewater, and when you buy a unit you buy a share of whatever that building runs.
The 2026 Deadline, Read From AyA's Own Ledger
AyA publishes a project tracker through its public project viewer, built from data its Dirección de Planificación Estratégica compiled in July 2025. Tamarindo appears there as project 2500-01, "Construcción del sistema de saneamiento para la comunidad de Tamarindo Guanacaste," within the Programa Saneamiento en Zonas Prioritarias (Grupo 2). Comparing that record with the 2021 plan shows how far the timeline has moved.
| What Voz de Guanacaste reported, May 2021 | What AyA's tracker shows, July 2025 | |
|---|---|---|
| Expected arrival | 2026 | Classified as a long-term action, after 2030 |
| Estimated cost | About ₡7 billion | ₡23,005,155,724 |
| Stage | Pre-investment studies and final designs through the first half of 2022 | Pre-investment, feasibility |
| Funding | ₡300 million from AyA's own funds for land and easements, ₡6 billion in external financing | "Sin financiamiento," with the note "Hay que buscar financiamiento" |
As of that July 2025 record, the project had covered about 6 percent of its full project cycle. Its schedule status is marked "En tiempo" both for its baseline and for its rescheduling.
The scope is substantial. The project calls for 22.3 km of gravity sewer, 6.9 km of force main, 14 pumping stations, and an activated-sludge treatment plant with biological nitrogen removal and UV disinfection, sized at 37.56 liters per second. It is meant to serve both Tamarindo and Langosta. Tamarindo needs a project that large because it has never had a public sewer. In April 2022, Periódico Mensaje reported that part of the town's wastewater went to septic tanks, and that failed tanks could send sewage into waterways.
The tracker also lists the project's origin as a "Recurso de amparo," a constitutional complaint. CRHoy reported in October 2020 that after a Sala Constitucional ruling, the Ministry of Health ordered AyA to build a sewer in Tamarindo within five months. The same report described a June 2017 complaint about a discharge into the mangrove area and the use of storm drains as sanitary sewers. Since that 2020 order, the expected date has moved from a five-month deadline to a 2026 forecast to the post-2030 classification in the current tracker.
What a Tamarindo Condo Purchase Includes
With no public network to connect to, each building operates its own wastewater system, either a septic system or a private treatment plant, known locally as a PTAR. For a condo, that plant is shared infrastructure, much like the pool or the roof, except that national law sets how it is monitored.
That law is the Reglamento de Vertido y Reuso de Aguas Residuales, Decreto Ejecutivo 33601-MINAE-S, which the Procuraduría General de la República's SCIJ database still lists in force. Under Article 5 of the full text, the entity that generates and discharges or reuses the wastewater must file periodic operational reports with the Ministry of Health. That entity can be a public or private individual or legal entity. Article 46 sets the frequency by flow. Generating entities with an average flow of up to 100 cubic meters a day report every six months, and larger ones report every quarter. A plant that receives wastewater from different generating entities reports every month, whatever its flow. For ordinary wastewater, the analysis covers flow, BOD, COD, pH, fats and oils, settleable and total suspended solids, methylene-blue-active substances, and temperature.
In a condo, then, the reporting duty generally falls on the entity that operates the shared plant, not on each unit owner. The cost and the compliance record still belong to all the owners together. A single-family home is exempt from filing these reports, but the regulation still requires it to treat its wastewater.
This is general information, not legal advice. How the decree applies to a particular building, and who holds which obligation under its condominium documents, is a question for your Costa Rican attorney.
Why the Beach's Four Stars Don't Cover Your Building
Most buyers see one public signal before they see anything else. In the 2025 Bandera Azul Ecológica results, reported by Periódico Mensaje on March 18, 2026, Playa Tamarindo earned four stars in the Rosada category. Playa Langosta, Playa Flamingo, and Playa Potrero each earned two.
A 2026 master's thesis from the Universidad de Costa Rica points the other way. It sampled beaches and rivers in Santa Cruz between 2022 and 2024, and on the ICAMPFF marine-coastal water quality index, Tamarindo scored 18.79 percent and Brasilito 26.83 percent. Flamingo and Langosta both scored above 85 percent. The author linked the weak results to tourism and urban pressure. In the same study, Ministry of Health environmental complaints for the 2020 to 2025 period were concentrated in Tamarindo, Langosta, and Potrero, and the author tied them to deficiencies in wastewater treatment plants.
The flag is a program award covering 2025. The index reflects water samples taken through 2024. Neither tells a buyer whether one particular building's plant is working. Only that building's own records can, and the decree requires those records to exist.
The thesis found one more pattern that matters on a calendar. Rivers in the study area were more polluted in the dry season and in better condition during the rains. Tamarindo's busiest months fall in the dry season, so a plant that copes well in a quiet September may face a much heavier load in high season.
One Street Shows How Fixes Happen Here
Without a public network, improvements in Tamarindo have come one street at a time. ADI Tamarindo, the community development association, describes one such project in its 2024 achievements report. After repeated complaints about contaminated water reaching the sea, ADIT managed and led a project on Calle del Parque, work it says began in 2019. The main goal was to close every illegal water outlet and install a new storm drainage system. The street also got sidewalks and asphalt. The report notes that the work also involves property-level steps, such as installing registration boxes, or cajas de registro.
On a street without a public sewer, each property's connections and outlets are part of the fix. The UCR thesis described the same structure at the governance level. Decisions are concentrated in the Municipalidad de Santa Cruz and the Ministry of Health, while ADIs and ASADAS have little coordination with them but contribute local knowledge. The thesis also recommends updating the Plan Regulador Costero.
Questions Worth Putting to a Building Before You Commit
Since the plant is shared infrastructure covered by a reporting rule, these records are reasonable to request during due diligence on a Tamarindo condo:
- Who operates the plant? Ask which legal entity is responsible for the discharge, since that entity files the Ministry of Health reports.
- The latest operational reports. Depending on the plant's daily flow and whether it serves more than one generating entity, reports should exist for each six-month, quarterly, or monthly period. Ask for the most recent ones and the lab results behind them.
- Maintenance and operating arrangements. Ask who services the plant now and how that cost appears in the association's budget.
- Any Ministry of Health orders or complaints. The thesis found complaints concentrated in Tamarindo and Langosta, so ask whether the building has received any.
- For a standalone home, ask how the septic system was built and how it has been maintained. The house is exempt from filing reports but not from the duty to treat its wastewater.
Frequently Asked Questions
Will Tamarindo condos eventually connect to a public sewer?
AyA has a defined project for Tamarindo and Langosta. As of the July 2025 tracker, it had no financing, was still in feasibility, and was classified as a long-term action after 2030.
Does the Blue Flag mean the water near my building is clean?
The four stars Playa Tamarindo earned in 2025 are a program award. The UCR index score, based on 2022 to 2024 samples, is a separate measurement and came out much lower.
Is this only a Tamarindo issue?
The project scope covers Langosta along with Tamarindo, and the thesis found complaints concentrated in Tamarindo, Langosta, and Potrero.
If you are comparing Tamarindo buildings and want help asking for plant reports, maintenance records, and association budgets before you make an offer, the team at Flamingo Beach Realty can put those requests together with you and connect you with local attorneys and engineers who review them. Contact Us when you are ready to look at a specific building.
