Mielno
Mielno in LW20855, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.9 m visibility. Phosphorus: 28.5 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
- Clarity
- 1.9 m
Why Mielno has no A–F grade
Mielno 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, 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 Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska).
Mielno is a lake in LW20855 County, Poland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-10-15. 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 Mielno
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 6.3 ft. Phosphorus level: 28.5 µg/L. Chlorophyll-a: 7.2 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.92 m | Not graded |
| Phosphorus | 28.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 7.2 µg/L | Not graded |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mielno
Compare lakeside cabins, hotels, and vacation rentals near Mielno in LW20855, 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 Mielno
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Fishing Mielno
Frequently asked questions about Mielno
What is the water quality of Mielno?
- Mielno in LW20855, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.9 m visibility. Phosphorus: 28.5 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
Is Mielno safe to swim in?
- Mielno 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 Mielno across LakeGrade
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Where this data comes from
12 measurements from 1 monitoring station, 2025. Retrieved from GIOŚ lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Główny Inspektorat Ochrony Środowiska
gios-pjwp12 samples · —
Analytical methods
- GIOŚ PJWP lake monitoring
Monitoring station identifiers (1)
PL02S0102_0084
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: 2025-10-15
Monitoring stations: 1