Water quality
Monitoring of the Ostreopsis micro-algae: samples, history and reports.
Concentration trends
Logarithmic scale. Zero values and "below detection threshold" values cannot be plotted on this scale (see the full table below). Dark red dots indicate a beach closure.
Approved testimonials
11- 🌊 Open-water swimming (30 min to 1 h) on 14/08/2026 · symptoms on 16/08/2026🟢 Mild🤢 Nausea😷 Cough🫁 Breathing difficulty
- 🌊 Open-water swimming (1 h to 3 h) on 11/08/2026 · no symptoms
- 🏊 Swimming (Less than 30 min) on 04/08/2026 · symptoms on 06/08/2026🔴 Severe🤮 Digestive problems (gastro)
- 🏊 Swimming (1 h to 3 h) on 04/08/2026 · symptoms on 06/08/2026🟢 Mild💫 Dizziness😷 Cough🫁 Breathing difficulty
- 🏊 Swimming (1 h to 3 h) on 31/07/2026 · symptoms on 01/08/2026🟠 Moderate👁️ Irritated eyes🤕 Headache
- 🏄 Surfing (Less than 30 min) on 29/07/2026 · symptoms on 30/07/2026🟢 Mild🤕 Headache
- 🌊 Open-water swimming (More than 3 h) on 29/07/2026 · symptoms on 29/07/2026🟠 Moderate🩹 Skin irritation🌡️ Fever / chills
- 🚶 Walk along the seashore (1 h to 3 h) on 16/07/2026 · symptoms on 18/07/2026🟠 Moderate🩹 Skin irritation
- 🏄 Surfing (30 min to 1 h) on 16/07/2026 · no symptoms
- 🌊 Open-water swimming (Less than 30 min) on 13/07/2026 · symptoms on 13/07/2026🟢 Mild👁️ Irritated eyes🤮 Digestive problems (gastro)🤕 Headache
- 🏄 Surfing (30 min to 1 h) on 05/07/2026 · symptoms on 05/07/2026🟠 Moderate🤮 Digestive problems (gastro)🫁 Breathing difficulty
Testimonials are anonymous and shown after moderation. Correlation does not imply causation.
Full sampling history
| Sample | Result | Cells/L | siamensis | ovata | Temp. | Status |
|---|---|---|---|---|---|---|
| 02/07/2026 | 03/07/2026 | 1 360 | 4% | 96% | 23.3°C | Low |
| 01/07/2026 | 02/07/2026 | — | — | — | — | Closure |
The beach
Tides, daylight and practical information — unrelated to water quality.
Data sources
- Official samples: Communauté d'Agglomération Pays Basque (CAPB) — the only ones used for status and closures.
- Tides: Open-Meteo forecasts (indicative).
- General beach information: OpenStreetMap contributors (ODbL) — may be incomplete or out of date.