Is Długie safe to swim in?

Długie 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.

Długie

Not yet rated

1.1 m clear · Eutrophic

Limited DataEutrophic

Długie in LW10675, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.1 m visibility. Phosphorus: 44.5 µg/L.

Clarity: 1.1 m

Where to stay →Safe to swim?

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Why Długie has no A–F grade

Długie 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).

Długie is a lake in LW10675 County, Poland.

Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-10-20. 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 Długie

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

Murky, only visible to about 3.6 ft. Phosphorus level: 44.5 µg/L. Trophic State Index: 59.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.1 m	Not graded
Phosphorus	44.5 µg/L	Not graded
Chlorophyll-a (Algae)	No recent samples
Trophic State Index (TSI)	59	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Długie

Compare lakeside cabins, hotels, and vacation rentals near Długie in LW10675, 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 Długie

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Fishing Długie

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

Frequently asked questions about Długie

What is the water quality of Długie?: Długie in LW10675, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.1 m visibility. Phosphorus: 44.5 µg/L.
Is Długie safe to swim in?: Długie 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 Długie across LakeGrade

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in Poland

Lakes in Poland

Official water quality for lakes in Poland

Lake water quality by country

EU bathing ratings and named-lake measurements

Where this data comes from

8 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 Środowiskagios-pjwp8 samples · —

Analytical methods

GIOŚ PJWP lake monitoring

Monitoring station identifiers (1)

PL02S0502_2185

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: 2025-10-20

Monitoring stations: 1

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