Where is Petit Lac du Bernadas?

Petit Lac du Bernadas is a lake in Gironde, France. This page reports official water-quality measurements, shown as reported.

Is Petit Lac du Bernadas safe to swim in?

Petit Lac du Bernadas 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.

Petit Lac du Bernadas

Gironde, FranceView map Directions

Eau France publishes the water-quality measurements for Petit Lac du Bernadas. Here is what has been measured.

Clarity

2.6 m

Typical for France

Secchi · sampled 2022

Phosphorus

16 µg/L

Less phosphorus than most

Measured by Eau France

Chlorophyll-a

3.6 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Petit Lac du Bernadas in Gironde, France has official water-quality measurements, shown as reported. Water clarity: 2.6 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 3.6 µg/L.

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How Petit Lac du Bernadas is classified

Petit Lac du Bernadas 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.

Petit Lac du Bernadas is a lake in Gironde County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2022-09-13. 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 Petit Lac du Bernadas 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 Petit Lac du Bernadas

These are the measurements Eau France publishes for Petit Lac du Bernadas. More on the source.

Moderate clarity, visible to about 8.5 ft. Phosphorus 16 µg/L. Chlorophyll-a 3.6 µg/L. TSI 45.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.6m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	16µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	3.6µg/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.	45	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Petit Lac du Bernadas

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

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Fishing Petit Lac du Bernadas

→ Petit Lac du Bernadas fishing regulations (limits, seasons, special rules)

Frequently asked questions about Petit Lac du Bernadas

Where is Petit Lac du Bernadas?: Petit Lac du Bernadas is a lake in Gironde, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Petit Lac du Bernadas?: Petit Lac du Bernadas in Gironde, France has official water-quality measurements, shown as reported. Water clarity: 2.6 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 3.6 µg/L.
Is Petit Lac du Bernadas safe to swim in?: Petit Lac du Bernadas 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

40 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-fr40 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

S2245043

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