Where is Bytyń Wielki?

Bytyń Wielki is a lake in LW10621, Poland. This page reports official water-quality measurements, shown as reported.

Is Bytyń Wielki safe to swim in?

Bytyń Wielki 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.

Bytyń Wielki

LW10621, PolandView map Directions

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

Clarity

3.7 m

Clearer than most

Secchi · sampled 2026

Phosphorus

23 µg/L

Less phosphorus than most

Measured by GIOŚ

Chlorophyll-a

7.6 µg/L

Less algae than most

Measured by GIOŚ

Limited data

See the measurements Directions Where to stay

Bytyń Wielki in LW10621, Poland has official water-quality measurements, shown as reported. Water clarity: 3.7 m visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 7.6 µg/L.

Loading map…

How Bytyń Wielki is classified

Bytyń Wielki 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, phosphorus and 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).

Bytyń Wielki is a lake in LW10621 County, Poland.

Source: the Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska) — not the EPA Water Quality Portal, last sampled 2026-06-17. Methodology: how these readings are compared.

What Bytyń Wielki is good for

From access and monitoring records, not editorial picks.

Clear water12 ft of visibility

Swimming conditions

No reading

Limited data

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

Whether Bytyń Wielki 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.

Get alerts for Bytyń Wielki →

Water quality measurements for Bytyń Wielki

These are the measurements GIOŚ publishes for Bytyń Wielki. More on the source.

Good clarity, visible to about 12 ft. Phosphorus 23 µg/L. Chlorophyll-a 7.6 µg/L. TSI 47.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	3.65m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	23µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	7.6µg/L	Measured, not scored 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.	47	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Bytyń Wielki

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

Stays via Stay22

Stays near Bytyń Wielki

Compare lakeside cabins, hotels, and vacation rentals near Bytyń Wielki in LW10621, 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 Bytyń Wielki

Prices for Oct 2–4, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow Bytyń Wielki’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Bytyń Wielki

→ Bytyń Wielki fishing regulations (limits, seasons, special rules)

Frequently asked questions about Bytyń Wielki

Where is Bytyń Wielki?: Bytyń Wielki is a lake in LW10621, Poland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Bytyń Wielki?: Bytyń Wielki in LW10621, Poland has official water-quality measurements, shown as reported. Water clarity: 3.7 m visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 7.6 µg/L.
Is Bytyń Wielki safe to swim in?: Bytyń Wielki 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 Bytyń Wielki across LakeQuality

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

15 measurements from 1 monitoring station, 2024–2026. Retrieved from GIOŚ lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

Główny Inspektorat Ochrony Środowiskagios-pjwp15 samples · —

Analytical methods

GIOŚ PJWP lake monitoring

Monitoring station identifiers (1)

PL02S0102_0111

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