Lac de Castagnère
Gers, FranceView mapDirections
Eau France publishes the water-quality measurements for Lac de Castagnère. Here is what has been measured.
- Limited data
Lac de Castagnère in Gers, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3 µg/L.
How Lac de Castagnère is classified
Lac de Castagnère 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 Castagnère is a lake in Gers County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-10-04. 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 Castagnère 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 Castagnère
These are the measurements Eau France publishes for Lac de Castagnère. More on the source.
Very murky, less than 3.1 ft of visibility. Phosphorus 39 µg/L. Chlorophyll-a 3 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.95m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 39µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 3µg/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. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lac de Castagnère
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Lac de Castagnère
Compare lakeside cabins, hotels, and vacation rentals near Lac de Castagnère in Gers, 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.
Top-rated places to stay near Lac de Castagnère
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Lac de Castagnère’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lac de Castagnère
Frequently asked questions about Lac de Castagnère
Where is Lac de Castagnère?
- Lac de Castagnère is a lake in Gers, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lac de Castagnère?
- Lac de Castagnère in Gers, France has official water-quality measurements, shown as reported. Water clarity: 1 m visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3 µg/L.
Is Lac de Castagnère safe to swim in?
- Lac de Castagnère 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.
Explore Lac de Castagnère across LakeQuality
More lakes in France
Where this data comes from
54 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-fr54 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
O6635513
Authority classifications are shown as the authority published them. See where the data comes from and data sources.