Latest samples: 28/09/2026
Latest report: 19/08/2026
Basque coast pollution & health
Follow the concentrations of the micro-algae Ostreopsis measured in water samples taken by the Communauté d'Agglomération Pays Basque, cross-referenced with anonymous testimonials from coastal users. Move the slider below to browse through the season.
Anonymous · 2 minutes · swimming, surfing, diving, seaside walks… with or without symptoms
…
Concentration trends — top 5 recent spots
Click a curve, a bar or a legend entry to filter the page on that data. Log scale; "<40" values and closures without a reading are not plotted. Stacked bars show the number of testimonials per exposure day over the period (all beaches, or the selected one).
Concentrations measured from 20/01/2026 to 19/10/2026
- Latest available readings
- Les deux Jumeaux · Hendaye28/09/2026500cells/LLow🌡 22.2°C
- Parlementia · Bidart28/09/2026280cells/LLow🌡 21.8°C
- Erromardie · Saint-Jean-de-Luz28/09/2026200cells/LLow🌡 21.9°C
- Mayarco · Saint-Jean-de-Luz28/09/202680cells/LLow🌡 22°C
- Port Vieux · Biarritz28/09/2026240cells/LLow🌡 21.4°C
- Cenitz · Guéthary28/09/2026440cells/LLow🌡 21.6°C
- Cenitz · Guéthary21/09/2026240cells/LLow🌡 21.4°C
- Parlementia · Bidart21/09/2026600cells/LLow🌡 21.4°C
- Mayarco · Saint-Jean-de-Luz21/09/2026480cells/LLow🌡 21.7°C
- Erromardie · Saint-Jean-de-Luz21/09/2026640cells/LLow🌡 21.2°C
| Date | Beach | Town | Cells/L | Temp. | Status |
|---|---|---|---|---|---|
| Latest available readings | |||||
| 28/09/2026 | Les deux Jumeaux | Hendaye | 500 | 22.2°C | Low |
| 28/09/2026 | Parlementia | Bidart | 280 | 21.8°C | Low |
| 28/09/2026 | Erromardie | Saint-Jean-de-Luz | 200 | 21.9°C | Low |
| 28/09/2026 | Mayarco | Saint-Jean-de-Luz | 80 | 22°C | Low |
| 28/09/2026 | Port Vieux | Biarritz | 240 | 21.4°C | Low |
| 28/09/2026 | Cenitz | Guéthary | 440 | 21.6°C | Low |
| 21/09/2026 | Cenitz | Guéthary | 240 | 21.4°C | Low |
| 21/09/2026 | Parlementia | Bidart | 600 | 21.4°C | Low |
| 21/09/2026 | Mayarco | Saint-Jean-de-Luz | 480 | 21.7°C | Low |
| 21/09/2026 | Erromardie | Saint-Jean-de-Luz | 640 | 21.2°C | Low |
Testimonials for this period
- Sables d'Or — Anglet · 🏊 Swimming (30 min to 1 h) on 19/08/2026no symptomssubmitted 2 months ago
- Sables d'Or — Anglet · 🌊 Open-water swimming (30 min to 1 h) on 18/08/2026no symptomssubmitted 2 months ago
- Côte des Basques — Biarritz · 🏊 Swimming (Less than 30 min) on 16/08/2026no symptomssubmitted 2 months ago
- Erromardie — Saint-Jean-de-Luz · 🏊 Swimming (Less than 30 min) on 16/08/2026symptomssubmitted 2 months ago🔴 Severe🩹 Skin irritation
- Erromardie — Saint-Jean-de-Luz · 🏊 Swimming (Less than 30 min) on 16/08/2026symptomssubmitted 2 months ago🔴 Severe😷 Cough
- Cenitz — Guéthary · 🏊 Swimming (Less than 30 min) on 16/08/2026symptomssubmitted 2 months ago🔴 Severe👁️ Irritated eyes
- Côte des Basques — Biarritz · 🌊 Open-water swimming (30 min to 1 h) on 16/08/2026symptomssubmitted 2 months ago🟠 Moderate💫 Dizziness🤢 Nausea👃 Throat / nose irritation
- Marbella — Biarritz · 🌊 Open-water swimming (30 min to 1 h) on 16/08/2026symptomssubmitted 2 months ago🟢 Mild🫁 Breathing difficulty😷 Cough💪 Muscle aches
- Mayarco — Saint-Jean-de-Luz · 🌊 Open-water swimming (Less than 30 min) on 16/08/2026symptomssubmitted 2 months ago🟢 Mild😷 Cough💪 Muscle aches🤢 Nausea
- Chambre d'Amour — Anglet · 🏊 Swimming (30 min to 1 h) on 16/08/2026symptomssubmitted 2 months ago🟠 Moderate😷 Cough
- Cenitz — Guéthary · 🏊 Swimming (30 min to 1 h) on 16/08/2026symptomssubmitted 2 months ago🟠 Moderate😷 Cough
- Marbella — Biarritz · 🌊 Open-water swimming (1 h to 3 h) on 16/08/2026no symptomssubmitted 2 months ago
- Grande Plage — Biarritz · 🤿 Diving (30 min to 1 h) on 16/08/2026no symptomssubmitted 2 months ago
- Mayarco — Saint-Jean-de-Luz · 🏊 Swimming (30 min to 1 h) on 16/08/2026symptomssubmitted 2 months ago🔴 Severe😷 Cough🫁 Breathing difficulty
- Ilbarritz — Bidart · 🌊 Open-water swimming (Less than 30 min) on 16/08/2026symptomssubmitted 2 months ago🔴 Severe🤕 Headache🫁 Breathing difficulty
- Les deux Jumeaux — Hendaye · 🚶 Walk along the seashore (Less than 30 min) on 15/08/2026symptomssubmitted 2 months ago🔴 Severe🤮 Digestive problems (gastro)🩹 Skin irritation👃 Throat / nose irritation
- Marbella — Biarritz · 🌊 Open-water swimming (Less than 30 min) on 15/08/2026symptomssubmitted 2 months ago🟢 Mild😷 Cough🤕 Headache
- Port Vieux — Biarritz · 🏊 Swimming (1 h to 3 h) on 15/08/2026no symptomssubmitted 2 months ago
- Les deux Jumeaux — Hendaye · 🏊 Swimming (30 min to 1 h) on 15/08/2026no symptomssubmitted 2 months ago
- Parlementia — Bidart · 🏊 Swimming (30 min to 1 h) on 15/08/2026symptomssubmitted 2 months ago🟠 Moderate👁️ Irritated eyes😷 Cough🩹 Skin irritation
- Alcyons — Guéthary · 🏊 Swimming (1 h to 3 h) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate🤢 Nausea
- Marbella — Biarritz · 🤿 Diving (30 min to 1 h) on 14/08/2026symptomssubmitted 2 months ago🔴 Severe👃 Throat / nose irritation
- Sables d'Or — Anglet · 🏄 Surfing (1 h to 3 h) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate💪 Muscle aches🤕 Headache
- Cenitz — Guéthary · 🚶 Walk along the seashore (Less than 30 min) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate💪 Muscle aches🌡️ Fever / chills😷 Cough
- Senix — Saint-Jean-de-Luz · 🌊 Open-water swimming (30 min to 1 h) on 14/08/2026symptomssubmitted 2 months ago🟢 Mild🤢 Nausea😷 Cough🫁 Breathing difficulty
- Sables d'Or — Anglet · 🌊 Open-water swimming (30 min to 1 h) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate👁️ Irritated eyes🩹 Skin irritation🤮 Digestive problems (gastro)
- Sables d'Or — Anglet · 🚶 Walk along the seashore (1 h to 3 h) on 14/08/2026symptomssubmitted 2 months ago🟢 Mild🤢 Nausea💫 Dizziness🫁 Breathing difficulty
- Chambre d'Amour — Anglet · 🚶 Walk along the seashore (30 min to 1 h) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate👁️ Irritated eyes
- Côte des Basques — Biarritz · 🏊 Swimming (1 h to 3 h) on 14/08/2026symptomssubmitted 2 months ago🟠 Moderate🤮 Digestive problems (gastro)👁️ Irritated eyes🫁 Breathing difficulty
- Uhabia sud — Bidart · 🏊 Swimming (30 min to 1 h) on 13/08/2026symptomssubmitted 2 months ago🟠 Moderate👁️ Irritated eyes👃 Throat / nose irritation
Anonymous testimonials shown after moderation. Correlation does not imply causation.
Samples taken by the Communauté d'Agglomération Pays Basque. Concentrations are expressed in cells per litre. Colour thresholds are indicative and do not constitute official health guidance — see the methodology and the page Understanding the Ostreopsis algae.