Jeleń
Jeleń in LW20991, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 6.3 m visibility. Chlorophyll-a (algae): 4.7 µg/L.
- Clarity
- 6.3 m
Why Jeleń has no A–F grade
Jeleń in Poland 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 Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska).
Jeleń is a lake in LW20991 County, Poland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-06-16. 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 Jeleń
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 20.8 ft down. Chlorophyll-a: 4.7 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.32 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 4.7 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Jeleń
Compare lakeside cabins, hotels, and vacation rentals near Jeleń in LW20991, Poland — 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 Jeleń
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Fishing Jeleń
Frequently asked questions about Jeleń
What is the water quality of Jeleń?
- Jeleń in LW20991, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 6.3 m visibility. Chlorophyll-a (algae): 4.7 µg/L.
Is Jeleń safe to swim in?
- Jeleń 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
4 measurements from 1 monitoring station, 2026. Retrieved from GIOŚ lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Główny Inspektorat Ochrony Środowiska
gios-pjwp4 samples · —
Analytical methods
- GIOŚ PJWP lake monitoring
Monitoring station identifiers (1)
PL01S0202_2258
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2026-06-16
Monitoring stations: 1