Retenue de la Bancalié
Retenue de la Bancalié in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.9 m visibility. Chlorophyll-a (algae): 1.6 µg/L.
- Clarity
- 3.9 m
Why Retenue de la Bancalié has no A–F grade
Retenue de la Bancalié 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.
Retenue de la Bancalié is a lake in Tarn County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2021-10-13. 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 Retenue de la Bancalié
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 12.6 ft. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.85 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.6 µg/L | Not graded |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Retenue de la Bancalié
Compare lakeside cabins, hotels, and vacation rentals near Retenue de la Bancalié in Tarn, 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 Retenue de la Bancalié
Frequently asked questions about Retenue de la Bancalié
What is the water quality of Retenue de la Bancalié?
- Retenue de la Bancalié in Tarn, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.9 m visibility. Chlorophyll-a (algae): 1.6 µg/L.
Is Retenue de la Bancalié safe to swim in?
- Retenue de la Bancalié 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
31 measurements from 1 monitoring station, 2018–2021. 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-fr31 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O4745003
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.