Etang du Gallardon
Etang du Gallardon in Yvelines, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.2 m visibility. Chlorophyll-a (algae): 4 µg/L.
- Clarity
- 4.2 m
Why Etang du Gallardon has no A–F grade
Etang du Gallardon 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 and algae (chlorophyll-a), but not phosphorus.
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.
Etang du Gallardon is a lake in Yvelines County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2025-09-17. 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 Etang du Gallardon
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 13.6 ft. Chlorophyll-a: 4 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.15 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 4 µg/L | Not graded |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Etang du Gallardon
Compare lakeside cabins, hotels, and vacation rentals near Etang du Gallardon in Yvelines, 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 Etang du Gallardon
Frequently asked questions about Etang du Gallardon
What is the water quality of Etang du Gallardon?
- Etang du Gallardon in Yvelines, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4.2 m visibility. Chlorophyll-a (algae): 4 µg/L.
Is Etang du Gallardon safe to swim in?
- Etang du Gallardon 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
11 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-fr11 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
H3009503
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.