Etang des Varennes
Sarthe, FranceView mapDirections
Eau France publishes the water-quality measurements for Etang des Varennes. Here is what has been measured.
- Limited data
Etang des Varennes in Sarthe, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 115 µg/L. Chlorophyll-a (algae): 14.2 µg/L.
How Etang des Varennes is classified
Etang des Varennes 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 des Varennes is a lake in Sarthe County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2024-09-26. 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 des Varennes 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 des Varennes
These are the measurements Eau France publishes for Etang des Varennes. More on the source.
Very murky, less than 3.3 ft of visibility. Phosphorus 115 µg/L. Chlorophyll-a 14.2 µg/L. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 115µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 14.2µg/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. | 63 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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Frequently asked questions about Etang des Varennes
Where is Etang des Varennes?
- Etang des Varennes is a lake in Sarthe, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Etang des Varennes?
- Etang des Varennes in Sarthe, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 115 µg/L. Chlorophyll-a (algae): 14.2 µg/L.
Is Etang des Varennes safe to swim in?
- Etang des Varennes 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
36 measurements from 1 monitoring station, 2017–2024. 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-fr36 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
M134910
Authority classifications are shown as the authority published them. See where the data comes from and data sources.