Etang de la Forêt
Etang de la Forêt in Marne, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Chlorophyll-a (algae): 62 µg/L.
- Clarity
- 0.4 m
Why Etang de la Forêt has no A–F grade
Etang de la Forêt 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 and algae (chlorophyll-a), but not phosphorus.
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 de la Forêt is a lake in Marne County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2024-09-25. 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 de la Forêt
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.3 ft of visibility. Chlorophyll-a: 62 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.4 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 62 µg/L | Not graded |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Etang de la Forêt
Compare lakeside cabins, hotels, and vacation rentals near Etang de la Forêt in Marne, France — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Etang de la Forêt
Frequently asked questions about Etang de la Forêt
What is the water quality of Etang de la Forêt?
- Etang de la Forêt in Marne, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Chlorophyll-a (algae): 62 µg/L.
Is Etang de la Forêt safe to swim in?
- Etang de la Forêt 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
12 measurements from 1 monitoring station, 2018–2024. 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-fr12 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
F1237403
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.