Where is Retenue du Jaunay?

Retenue du Jaunay is a lake in Vendée, France. This page reports official water-quality measurements, shown as reported.

Is Retenue du Jaunay safe to swim in?

Retenue du Jaunay 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.

Retenue du Jaunay

Vendée, FranceView map Directions

Eau France publishes the water-quality measurements for Retenue du Jaunay. Here is what has been measured.

Clarity

0.4 m

Murkier than most

Secchi · sampled 2025

Phosphorus

90 µg/L

More phosphorus than most

Measured by Eau France

Chlorophyll-a

17.5 µg/L

More algae than most

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Retenue du Jaunay in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 0.4 m visibility. Phosphorus: 90 µg/L. Chlorophyll-a (algae): 17.5 µg/L.

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How Retenue du Jaunay is classified

Retenue du Jaunay 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.

Retenue du Jaunay is a lake in Vendée County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-10-02. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Retenue du Jaunay 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.

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Water quality measurements for Retenue du Jaunay

These are the measurements Eau France publishes for Retenue du Jaunay. More on the source.

Very murky, less than 1.3 ft of visibility. Phosphorus 90 µg/L. Chlorophyll-a 17.5 µg/L. TSI 67.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.4m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	90µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	17.5µg/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.	67	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

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Answers come straight from the public measurements and survey records on this page.

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Fishing Retenue du Jaunay

→ Retenue du Jaunay fishing regulations (limits, seasons, special rules)

Frequently asked questions about Retenue du Jaunay

Where is Retenue du Jaunay?: Retenue du Jaunay is a lake in Vendée, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Retenue du Jaunay?: Retenue du Jaunay in Vendée, France has official water-quality measurements, shown as reported. Water clarity: 0.4 m visibility. Phosphorus: 90 µg/L. Chlorophyll-a (algae): 17.5 µg/L.
Is Retenue du Jaunay safe to swim in?: Retenue du Jaunay 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

277 measurements from 1 monitoring station, 2017–2025. 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-fr277 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

N120510

Authority classifications are shown as the authority published them. See where the data comes from and data sources.