Etang de Carcraon
Etang de Carcraon in Ille-et-Vilaine, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.5 m visibility. Phosphorus: 450 µg/L. Chlorophyll-a (algae): 20.2 µg/L.
- Clarity
- 0.5 m
Why Etang de Carcraon has no A–F grade
Etang de Carcraon 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 de Carcraon is a lake in Ille-et-Vilaine County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-09-22. 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 Carcraon
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.6 ft of visibility. Phosphorus level: 450 µg/L. Chlorophyll-a: 20.2 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.5 m | Not graded |
| Phosphorus | 450 µg/L | Not graded |
| Chlorophyll-a (Algae) | 20.2 µg/L | Not graded |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Etang de Carcraon
Compare lakeside cabins, hotels, and vacation rentals near Etang de Carcraon in Ille-et-Vilaine, 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 Carcraon
Frequently asked questions about Etang de Carcraon
What is the water quality of Etang de Carcraon?
- Etang de Carcraon in Ille-et-Vilaine, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.5 m visibility. Phosphorus: 450 µg/L. Chlorophyll-a (algae): 20.2 µg/L.
Is Etang de Carcraon safe to swim in?
- Etang de Carcraon 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
39 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-fr39 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
J741510S
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.