Lac du Mesnil
Lac du Mesnil in Eure, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.6 m visibility. Chlorophyll-a (algae): 6.5 µg/L.
- Clarity
- 1.6 m
Why Lac du Mesnil has no A–F grade
Lac du Mesnil 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.
Lac du Mesnil is a lake in Eure County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2023-09-27. 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 du Mesnil
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 5.2 ft. Chlorophyll-a: 6.5 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 6.5 µg/L | Not graded |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac du Mesnil
Compare lakeside cabins, hotels, and vacation rentals near Lac du Mesnil in Eure, 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 du Mesnil
Frequently asked questions about Lac du Mesnil
What is the water quality of Lac du Mesnil?
- Lac du Mesnil in Eure, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.6 m visibility. Chlorophyll-a (algae): 6.5 µg/L.
Is Lac du Mesnil safe to swim in?
- Lac du Mesnil 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
8 measurements from 1 monitoring station, 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-fr8 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
H4389203
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.