Retenue de Rochereau
Vendée, FranceView mapDirections
Eau France publishes the water-quality measurements for Retenue de Rochereau. Here is what has been measured.
- Limited data
Retenue de Rochereau in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
How Retenue de Rochereau is classified
Retenue de Rochereau in France is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the French water agencies, via UNEP GEMS/Water.
Retenue de Rochereau is a lake in Vendée County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-10-01. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Retenue de Rochereau is safe to swim in today is a call for the French water agencies, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Retenue de Rochereau
These are the measurements Eau France publishes for Retenue de Rochereau. More on the source.
Very murky, less than 3.2 ft of visibility. Phosphorus 25 µg/L. Chlorophyll-a 13.4 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.99m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 25µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 13.4µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Retenue de Rochereau
Where is Retenue de Rochereau?
- Retenue de Rochereau is a lake in Vendée, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Retenue de Rochereau?
- Retenue de Rochereau in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
Is Retenue de Rochereau safe to swim in?
- Retenue de Rochereau has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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Where this data comes from
41 measurements from 1 monitoring station, 2016–2025. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-20.
Collected and reported by
- Office français de la biodiversité (Hub'Eau)
hubeau-fr41 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
N30-410
Authority classifications are shown as the authority published them. See where the data comes from and data sources.