Lac D'Issarles
Lac D'Issarles in Ardèche, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.9 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 6 µg/L.
- Clarity
- 4.9 m
Why Lac D'Issarles has no A–F grade
Lac D'Issarles in France is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the French water agencies, via UNEP GEMS/Water.
Lac D'Issarles is a lake in Ardèche County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lac D'Issarles
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 16.1 ft down. Phosphorus level: 10 µg/L. Chlorophyll-a: 6 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.89 m | Not graded |
| Phosphorus | 10 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6 µg/L | Not graded |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac D'Issarles
Compare lakeside cabins, hotels, and vacation rentals near Lac D'Issarles in Ardèche, 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 Lac D'Issarles
Frequently asked questions about Lac D'Issarles
What is the water quality of Lac D'Issarles?
- Lac D'Issarles in Ardèche, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.9 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 6 µg/L.
Is Lac D'Issarles safe to swim in?
- Lac D'Issarles 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
27 measurements from 1 monitoring station, 2019–2025. 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-fr27 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
K002910
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.