Lago Trasimeno
Perugia, ItalyView mapDirections
ARPA publishes the water-quality measurements for Lago Trasimeno. Here is what has been measured.
- Limited data
Lago Trasimeno in Perugia, Italy has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 40 µg/L.
How Lago Trasimeno is classified
Lago Trasimeno 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 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 regional environmental agencies (ARPA Lombardia, ARPA Veneto, Arpae Emilia-Romagna, and ARPA Umbria).
Lago Trasimeno is a lake in Perugia 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 2024-11-11. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lago Trasimeno 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.
Water quality measurements for Lago Trasimeno
These are the measurements ARPA publishes for Lago Trasimeno. More on the source.
Very murky, less than 2 ft of visibility. Phosphorus 40 µg/L. TSI 62.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.6m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 40µg/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. | 62 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Lago Trasimeno
Where is Lago Trasimeno?
- Lago Trasimeno is a lake in Perugia, Italy. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lago Trasimeno?
- Lago Trasimeno in Perugia, Italy has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 40 µg/L.
Is Lago Trasimeno safe to swim in?
- Lago Trasimeno 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
212 measurements from 2 monitoring stations, 2016–2024. Retrieved from Italian regional ARPA lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- ARPA Umbria
arpa-umb212 samples · 2016–2024
Analytical methods
- ARPA Umbria lake monitoring
Monitoring station identifiers (2)
TRS30TRS35
Authority classifications are shown as the authority published them. See where the data comes from and data sources.