Is Żerdno safe to swim in?

Żerdno 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.

Żerdno

Not yet rated

2.5 m clear · Eutrophic

Limited DataEutrophic

Żerdno in LW10682, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Phosphorus: 33 µg/L.

Clarity: 2.5 m

Where to stay →Safe to swim?

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Why Żerdno has no A–F grade

Żerdno 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 phosphorus, but not 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).

Żerdno is a lake in LW10682 County, Poland.

Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-04-20. Grade methodology: LakeGrade methodology.

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Swimming Safety

Not rated

Limited data

Not rated for swimming — there is not enough monitoring data to judge this lake

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Water quality measurements for Żerdno

These readings exist but do not meet the evidence bar for an A–F grade — see why.

Moderate clarity, visible to about 8.2 ft. Phosphorus level: 33 µg/L. Trophic State Index: 51.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.5 m	Not graded
Phosphorus	33 µg/L	Not graded
Chlorophyll-a (Algae)	No recent samples
Trophic State Index (TSI)	51	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Żerdno

Compare lakeside cabins, hotels, and vacation rentals near Żerdno in LW10682, 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 Żerdno

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Fishing Żerdno

→ Żerdno fishing regulations (limits, seasons, special rules)

Frequently asked questions about Żerdno

What is the water quality of Żerdno?: Żerdno in LW10682, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Phosphorus: 33 µg/L.
Is Żerdno safe to swim in?: Żerdno 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 Żerdno across LakeGrade

Lake Fishing Forecast

Species activity outlook by water temperature and season

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Lakes in Poland

Official water quality for lakes in Poland

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EU bathing ratings and named-lake measurements

Where this data comes from

2 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 Środowiskagios-pjwp2 samples · —

Analytical methods

GIOŚ PJWP lake monitoring

Monitoring station identifiers (1)

PL02S0102_2024

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: 2026-04-20

Monitoring stations: 1

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