Lac des Quatre Cantons
Lac des Quatre Cantons in Landes, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.3 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
- Clarity
- 4.3 m
Why Lac des Quatre Cantons has no A–F grade
Lac des Quatre Cantons 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.
Lac des Quatre Cantons is a lake in Landes County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2020-09-30. 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 Lac des Quatre Cantons
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 14 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 2.8 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.26 m | Not graded |
| Phosphorus | 10 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.8 µg/L | Not graded |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac des Quatre Cantons
Compare lakeside cabins, hotels, and vacation rentals near Lac des Quatre Cantons in Landes, 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 Lac des Quatre Cantons
Frequently asked questions about Lac des Quatre Cantons
What is the water quality of Lac des Quatre Cantons?
- Lac des Quatre Cantons in Landes, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.3 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Is Lac des Quatre Cantons safe to swim in?
- Lac des Quatre Cantons 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
24 measurements from 1 monitoring station, 2017–2020. 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-fr24 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
Q2615133
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.