Lago di Ganna
Lago di Ganna in Varese, Italy has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.1 m visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
- Clarity
- 2.1 m
Why Lago di Ganna has no A–F grade
Lago di Ganna in Italy 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, phosphorus and 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 regional environmental agencies (ARPA Lombardia, ARPA Veneto, Arpae Emilia-Romagna, and ARPA Umbria).
Lago di Ganna is a lake in Varese County, Italy.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-11-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lago di Ganna
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 6.7 ft. Phosphorus level: 8 µg/L. Chlorophyll-a: 1.9 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.05 m | Not graded |
| Phosphorus | 8 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1.9 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lago di Ganna
Compare lakeside cabins, hotels, and vacation rentals near Lago di Ganna in Varese, Italy — 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.
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Fishing Lago di Ganna
Frequently asked questions about Lago di Ganna
What is the water quality of Lago di Ganna?
- Lago di Ganna in Varese, Italy has official water-quality measurements, not a LakeQuality A–F grade. 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 Lombardia
arpa-lom58 samples · 2018–2021
Analytical methods
- ARPA Lombardia lake monitoring
Monitoring station identifiers (1)
POLSGALN1lo1
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: 2021-11-16
Monitoring stations: 1