Where is Gravieres de L'Etang de la Chaise?

Gravieres de L'Etang de la Chaise is a lake in Ille-et-Vilaine, France. This page reports official water-quality measurements, shown as reported.

Is Gravieres de L'Etang de la Chaise safe to swim in?

Gravieres de L'Etang de la Chaise 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.

Gravieres de L'Etang de la Chaise

Ille-et-Vilaine, FranceView map Directions

Eau France publishes the water-quality measurements for Gravieres de L'Etang de la Chaise. Here is what has been measured.

Clarity

1.4 m

Typical for France

Secchi · sampled 2016

Chlorophyll-a

11.9 µg/L

Typical for France

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Gravieres de L'Etang de la Chaise in Ille-et-Vilaine, France has official water-quality measurements, shown as reported. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 11.9 µg/L.

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How Gravieres de L'Etang de la Chaise is classified

Gravieres de L'Etang de la Chaise 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 and algae (chlorophyll-a), but not phosphorus.

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.

Gravieres de L'Etang de la Chaise is a lake in Ille-et-Vilaine County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2016-09-05. 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 Gravieres de L'Etang de la Chaise 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 Gravieres de L'Etang de la Chaise

These are the measurements Eau France publishes for Gravieres de L'Etang de la Chaise. More on the source.

Murky, only visible to about 4.5 ft. Chlorophyll-a 11.9 µg/L. TSI 55.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.36m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus		No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	11.9µg/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.	55	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Gravieres de L'Etang de la Chaise

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

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Stays near Gravieres de L'Etang de la Chaise

Compare lakeside cabins, hotels, and vacation rentals near Gravieres de L'Etang de la Chaise in Ille-et-Vilaine, 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.

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Fishing Gravieres de L'Etang de la Chaise

→ Gravieres de L'Etang de la Chaise fishing regulations (limits, seasons, special rules)

Frequently asked questions about Gravieres de L'Etang de la Chaise

Where is Gravieres de L'Etang de la Chaise?: Gravieres de L'Etang de la Chaise is a lake in Ille-et-Vilaine, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Gravieres de L'Etang de la Chaise?: Gravieres de L'Etang de la Chaise in Ille-et-Vilaine, France has official water-quality measurements, shown as reported. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 11.9 µg/L.
Is Gravieres de L'Etang de la Chaise safe to swim in?: Gravieres de L'Etang de la Chaise 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 Gravieres de L'Etang de la Chaise across LakeQuality

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Where this data comes from

8 measurements from 1 monitoring station, 2016. 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-fr8 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

J722990V

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