Etang de Tremelin
Etang de Tremelin in Ille-et-Vilaine, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.5 m visibility. Chlorophyll-a (algae): 3 µg/L.
- Clarity
- 1.5 m
Why Etang de Tremelin has no A–F grade
Etang de Tremelin 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 de Tremelin 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 2024-09-24. Grade methodology: LakeGrade methodology.
Watch Etang de Tremelin water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Etang de Tremelin
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.9 ft. Chlorophyll-a: 3 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.49 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3 µg/L | Not graded |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Etang de Tremelin
Compare lakeside cabins, hotels, and vacation rentals near Etang de Tremelin 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.
Top-rated places to stay near Etang de Tremelin
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Etang de Tremelin
Frequently asked questions about Etang de Tremelin
What is the water quality of Etang de Tremelin?
- Etang de Tremelin in Ille-et-Vilaine, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.5 m visibility. Chlorophyll-a (algae): 3 µg/L.
Is Etang de Tremelin safe to swim in?
- Etang de Tremelin 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 Tremelin across LakeGrade
More lakes in France
Where this data comes from
16 measurements from 1 monitoring station, 2018–2024. 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-fr16 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
J733530S
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.