Where is Lago di Ganna?

Lago di Ganna is a lake in Varese, Italy. This page reports official water-quality measurements, shown as reported.

Is Lago di Ganna safe to swim in?

Lago di Ganna 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.

Lago di Ganna

Varese, ItalyView map Directions

ARPA publishes the water-quality measurements for Lago di Ganna. Here is what has been measured.

Clarity

2.1 m

Typical for Italy

Secchi · sampled 2021

Phosphorus

8 µg/L

Less phosphorus than most

Measured by ARPA

Chlorophyll-a

1.9 µg/L

Measured by ARPA

Limited data

See the measurements Directions Where to stay

Lago di Ganna in Varese, Italy has official water-quality measurements, shown as reported. Water clarity: 2.1 m visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 1.9 µg/L.

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How Lago di Ganna is classified

Lago di Ganna in Italy 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 regional environmental agencies (ARPA Lombardia, ARPA Veneto, Arpae Emilia-Romagna, and ARPA Umbria).

Lago di Ganna is a lake in Varese County, Italy.

Source: the regional environmental agencies (ARPA Lombardia, ARPA Veneto, Arpae Emilia-Romagna, and ARPA Umbria) — not the EPA Water Quality Portal, last sampled 2021-11-16. 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 Lago di Ganna is safe to swim in today is a call for the regional environmental agencies (ARPA Lombardia, ARPA Veneto, Arpae Emilia-Romagna, and ARPA Umbria) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Lago di Ganna

These are the measurements ARPA publishes for Lago di Ganna. More on the source.

Moderate clarity, visible to about 6.7 ft. Phosphorus 8 µg/L. Chlorophyll-a 1.9 µg/L. TSI 40.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.05m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	8µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	1.9µg/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.	40	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Lago di Ganna

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

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Stays near Lago di Ganna

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Fishing Lago di Ganna

→ Lago di Ganna fishing regulations (limits, seasons, special rules)

Frequently asked questions about Lago di Ganna

Where is Lago di Ganna?: Lago di Ganna is a lake in Varese, Italy. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lago di Ganna?: Lago di Ganna in Varese, Italy has official water-quality measurements, shown as reported. Water clarity: 2.1 m visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
Is Lago di Ganna safe to swim in?: Lago di Ganna 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.

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Where this data comes from

58 measurements from 1 monitoring station, 2018–2021. Retrieved from Italian regional ARPA lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

ARPA Lombardiaarpa-lom58 samples · 2018–2021

Analytical methods

ARPA Lombardia lake monitoring

Monitoring station identifiers (1)

POLSGALN1lo1

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