Etang des Varennes
Etang des Varennes in Sarthe, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1 m visibility. Phosphorus: 115 µg/L. Chlorophyll-a (algae): 14.2 µg/L.
- Clarity
- 1 m
Why Etang des Varennes has no A–F grade
Etang des Varennes in France is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Etang des Varennes
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 3.3 ft of visibility. Phosphorus level: 115 µg/L. Chlorophyll-a: 14.2 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 m | Not graded |
| Phosphorus | 115 µg/L | Not graded |
| Chlorophyll-a (Algae) | 14.2 µg/L | Not graded |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Etang des Varennes
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Fishing Etang des Varennes
Frequently asked questions about Etang des Varennes
What is the water quality of Etang des Varennes?
- Etang des Varennes in Sarthe, France has official water-quality measurements, not a LakeQuality A–F grade. 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 stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.