Długie is a lake in LW10675, Poland. This page reports official water-quality measurements, shown as reported.

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

LW10675, PolandView map Directions

GIOŚ publishes the water-quality measurements for Długie. Here is what has been measured.

Clarity

1.1 m

Typical for Poland

Secchi · sampled 2025

Phosphorus

44.5 µg/L

Typical for Poland

Measured by GIOŚ

Limited data

See the measurements Directions Where to stay

Długie in LW10675, Poland has official water-quality measurements, shown as reported. Water clarity: 1.1 m visibility. Phosphorus: 44.5 µg/L.

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How Długie is classified

Długie in Poland is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska).

Długie is a lake in LW10675 County, Poland.

Source: the Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska) — not the EPA Water Quality Portal, last sampled 2025-10-20. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Długie is safe to swim in today is a call for the Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Długie

These are the measurements GIOŚ publishes for Długie. More on the source.

Murky, only visible to about 3.6 ft. Phosphorus 44.5 µg/L. TSI 59.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.1m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	44.5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)		No reading The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	59	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Długie

Answers come straight from the public measurements and survey records on this page.

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Stays near Długie

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Fishing Długie

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

Frequently asked questions about Długie

Where is Długie?: Długie is a lake in LW10675, Poland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Długie?: Długie in LW10675, Poland has official water-quality measurements, shown as reported. 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 LakeQuality

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Species activity outlook by water temperature and season

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Lakes in Poland

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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 shown as the authority published them. See where the data comes from and data sources.