Lago Maggiore
Lago Maggiore in Varese, Italy has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 5.9 m visibility. Phosphorus: 5.5 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
- Clarity
- 5.9 m
Why Lago Maggiore has no A–F grade
Lago Maggiore 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 Maggiore is a lake in Varese County, Italy.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-10-13. 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 Maggiore
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 19.2 ft down. Phosphorus level: 5.5 µg/L. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.85 m | Not graded |
| Phosphorus | 5.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.3 µg/L | Not graded |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lago Maggiore
Compare lakeside cabins, hotels, and vacation rentals near Lago Maggiore 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 Maggiore
Frequently asked questions about Lago Maggiore
What is the water quality of Lago Maggiore?
- Lago Maggiore in Varese, Italy has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 5.9 m visibility. Phosphorus: 5.5 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Is Lago Maggiore safe to swim in?
- Lago Maggiore 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
29 measurements from 2 monitoring stations, 2018–2020. Retrieved from Italian regional ARPA lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- ARPA Lombardia
arpa-lom29 samples · 2018–2020
Analytical methods
- ARPA Lombardia lake monitoring
Monitoring station identifiers (2)
POTI2LN1in3POTI2LN1in2
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: 2020-10-13
Monitoring stations: 2