Where is Etang de Naguilhes?

Etang de Naguilhes is a lake in Ariège, France. This page reports official water-quality measurements, shown as reported.

Is Etang de Naguilhes safe to swim in?

Etang de Naguilhes 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.

Etang de Naguilhes

Ariège, FranceView map Directions

Eau France publishes the water-quality measurements for Etang de Naguilhes. Here is what has been measured.

Clarity

9.3 m

Clearer than most

Secchi · sampled 2023

Chlorophyll-a

1 µg/L

Less algae than most

Measured by Eau France

Limited data

See the measurements Directions Where to stay

Etang de Naguilhes in Ariège, France has official water-quality measurements, shown as reported. Water clarity: 9.3 m visibility. Chlorophyll-a (algae): 1 µg/L.

Loading map…

How Etang de Naguilhes is classified

Etang de Naguilhes 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.

Etang de Naguilhes is a lake in Ariège County, France.

Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2023-10-03. Methodology: how these readings are compared.

What Etang de Naguilhes is good for

From access and monitoring records, not editorial picks.

Clear water30.3 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 Etang de Naguilhes 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 Etang de Naguilhes →

Water quality measurements for Etang de Naguilhes

These are the measurements Eau France publishes for Etang de Naguilhes. More on the source.

Crystal clear, you can see 30.3 ft down. Chlorophyll-a 1 µg/L. TSI 29.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	9.25m	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)	1µg/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.	29	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

Ask about Etang de Naguilhes

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

Stays via Stay22

Stays near Etang de Naguilhes

Compare lakeside cabins, hotels, and vacation rentals near Etang de Naguilhes in Ariège, 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 Etang de Naguilhes

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 Etang de Naguilhes’s readings

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

Or email

Fishing Etang de Naguilhes

→ Etang de Naguilhes fishing regulations (limits, seasons, special rules)

Frequently asked questions about Etang de Naguilhes

Where is Etang de Naguilhes?: Etang de Naguilhes is a lake in Ariège, France. This page reports official water-quality measurements, shown as reported.
What is the water quality of Etang de Naguilhes?: Etang de Naguilhes in Ariège, France has official water-quality measurements, shown as reported. Water clarity: 9.3 m visibility. Chlorophyll-a (algae): 1 µg/L.
Is Etang de Naguilhes safe to swim in?: Etang de Naguilhes 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 Etang de Naguilhes 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

48 measurements from 1 monitoring station, 2016–2023. 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-fr48 samples · —

Analytical methods

Hub'Eau / Naïades plans d'eau

Monitoring station identifiers (1)

O1025023

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