Barrage du Filleit
Barrage du Filleit in Ariège, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Chlorophyll-a (algae): 1.7 µg/L.
- Clarity
- 2.5 m
Why Barrage du Filleit has no A–F grade
Barrage du Filleit 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.
Barrage du Filleit is a lake in Ariège County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-04. 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 Barrage du Filleit
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 8 ft. Chlorophyll-a: 1.7 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.45 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.7 µg/L | Not graded |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Barrage du Filleit
Compare lakeside cabins, hotels, and vacation rentals near Barrage du Filleit in Ariège, 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 Barrage du Filleit
Frequently asked questions about Barrage du Filleit
What is the water quality of Barrage du Filleit?
- Barrage du Filleit in Ariège, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Chlorophyll-a (algae): 1.7 µg/L.
Is Barrage du Filleit safe to swim in?
- Barrage du Filleit 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
32 measurements from 1 monitoring station, 2019–2022. 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-fr32 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O0745003
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.