Etang de Vioreau
Loire-Atlantique, FranceView mapDirections
Eau France publishes the water-quality measurements for Etang de Vioreau. Here is what has been measured.
- Limited data
Etang de Vioreau in Loire-Atlantique, France has official water-quality measurements, shown as reported. Water clarity: 0.9 m visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.5 µg/L.
How Etang de Vioreau is classified
Etang de Vioreau 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.
Etang de Vioreau is a lake in Loire-Atlantique County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-05. 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 Etang de Vioreau 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 Etang de Vioreau
These are the measurements Eau France publishes for Etang de Vioreau. More on the source.
Very murky, less than 2.9 ft of visibility. Phosphorus 25 µg/L. Chlorophyll-a 13.5 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.89m | 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) | 13.5µg/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 Etang de Vioreau
Where is Etang de Vioreau?
- Etang de Vioreau is a lake in Loire-Atlantique, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Etang de Vioreau?
- Etang de Vioreau in Loire-Atlantique, France has official water-quality measurements, shown as reported. Water clarity: 0.9 m visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.5 µg/L.
Is Etang de Vioreau safe to swim in?
- Etang de Vioreau 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
32 measurements from 1 monitoring station, 2016–2022. 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-fr32 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
M633564T
Authority classifications are shown as the authority published them. See where the data comes from and data sources.