Lac de L'Uby
Gers, FranceView mapDirections
Eau France publishes the water-quality measurements for Lac de L'Uby. Here is what has been measured.
- Limited data
Lac de L'Uby in Gers, France has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 18.7 µg/L.
How Lac de L'Uby is classified
Lac de L'Uby in France is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the French water agencies, via UNEP GEMS/Water.
Lac de L'Uby is a lake in Gers County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-11. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lac de L'Uby is safe to swim in today is a call for the French water agencies, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lac de L'Uby
These are the measurements Eau France publishes for Lac de L'Uby. More on the source.
Very murky, less than 1.9 ft of visibility. Phosphorus 50 µg/L. Chlorophyll-a 18.7 µg/L. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.57m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 50µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 18.7µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 63 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Lac de L'Uby
Where is Lac de L'Uby?
- Lac de L'Uby is a lake in Gers, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lac de L'Uby?
- Lac de L'Uby in Gers, France has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 18.7 µg/L.
Is Lac de L'Uby safe to swim in?
- Lac de L'Uby 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
48 measurements from 1 monitoring station, 2016–2022. 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-fr48 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
Q2255003
Authority classifications are shown as the authority published them. See where the data comes from and data sources.