Where is Lac des Quatre Cantons?

Lac des Quatre Cantons is a lake in Landes, France. This page reports official water-quality measurements, shown as reported.

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.

Lac des Quatre Cantons

Landes, FranceView map Directions

Eau France publishes the water-quality measurements for Lac des Quatre Cantons. Here is what has been measured.

Clarity

4.3 m

Clearer than most

Secchi · sampled 2020

Phosphorus

10 µg/L

Less phosphorus than most

Measured by Eau France

Chlorophyll-a

2.8 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Lac des Quatre Cantons in Landes, France has official water-quality measurements, shown as reported. Water clarity: 4.3 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 2.8 µg/L.

Loading map…

How Lac des Quatre Cantons is classified

Lac des Quatre Cantons 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 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. Methodology: how these readings are compared.

What Lac des Quatre Cantons is good for

From access and monitoring records, not editorial picks.

Clear water14 ft of visibility

Swimming conditions

No reading

Limited data

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

Whether Lac des Quatre Cantons 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.

Get alerts for Lac des Quatre Cantons →

Water quality measurements for Lac des Quatre Cantons

These are the measurements Eau France publishes for Lac des Quatre Cantons. More on the source.

Good clarity, visible to about 14 ft. Phosphorus 10 µg/L. Chlorophyll-a 2.8 µg/L. TSI 39.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	4.26m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	10µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	2.8µg/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.	39	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about Lac des Quatre Cantons

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

Stays via Stay22

Stays 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.

Top-rated places to stay near Lac des Quatre Cantons

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 des Quatre Cantons’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Lac des Quatre Cantons

→ Lac des Quatre Cantons fishing regulations (limits, seasons, special rules)

Frequently asked questions about Lac des Quatre Cantons

Where is Lac des Quatre Cantons?: Lac des Quatre Cantons is a lake in Landes, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lac des Quatre Cantons?: Lac des Quatre Cantons in Landes, France has official water-quality measurements, shown as reported. 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.

Explore Lac des Quatre Cantons across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in France

Lakes in France

Official water quality for lakes in France

Lake water quality by country

EU bathing ratings and named-lake measurements

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