Clearest lakes in Italy
Clearest lakes in Italy: 49 named lakes have an official Secchi depth. The 20 below are ranked by that reading — water clarity, not a LakeQuality A–F grade.
Lake map
Highest Secchi readings in Italy
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Lago di Truzzo | Sondrio | 4.0 µg/L | — | 20 m | 2018 |
| Lago di Garda | Verona | 8.0 µg/L | 2.2 µg/L | 8.1 m | 2025 |
| Lago di Palù | Sondrio | 8.0 µg/L | — | 8.0 m | 2021 |
| Lago di Montespluga | Sondrio | 5.0 µg/L | — | 6.5 m | 2021 |
| Lago Maggiore | Varese | 5.5 µg/L | 2.3 µg/L | 5.8 m | 2020 |
| Lago di Como | Lecco | 12 µg/L | — | 5.8 m | 2021 |
| Lago di Palabione | Sondrio | 8.0 µg/L | — | 5.7 m | 2019 |
| Lago di Garlate | Lecco | 13 µg/L | — | 5.5 m | 2021 |
| Lago del Gallo | Sondrio | 8.5 µg/L | — | 5.5 m | 2021 |
| Lago di Ghirla | Varese | 10 µg/L | — | 4.9 m | 2021 |
| Lago di Lugano | Varese | 13 µg/L | — | 4.5 m | 2021 |
| Lago di Idro | Brescia | 13 µg/L | — | 4.0 m | 2021 |
| Lago di Iseo | Brescia | 11 µg/L | — | 4.0 m | 2021 |
| Lago di Misurina | Belluno | 5.0 µg/L | 1.1 µg/L | 4.0 m | 2025 |
| Lago di Varese | Varese | 27 µg/L | — | 3.8 m | 2021 |
| Lago di Piano | Como | 15 µg/L | — | 3.5 m | 2021 |
| Lago di Lago | Treviso | 10 µg/L | 3.8 µg/L | 3.4 m | 2025 |
| Lago di Corlo | Belluno | 9.0 µg/L | 5.0 µg/L | 3.4 m | 2025 |
| Lago del Mis | Belluno | 6.0 µg/L | 1.5 µg/L | 3.3 m | 2025 |
| Lago di Segrino | Como | 10 µg/L | — | 3.3 m | 2021 |
Showing 20 of 49 named lakes. Open a county or place page for the rest.
Frequently asked questions
- Which lakes in Italy are the clearest?
- 49 named lakes in Italy have an official Secchi depth. This page ranks the 20 deepest readings. Secchi is a clarity measurement, not a swim-safety class and not a LakeQuality A–F grade.
- Is clear water the same as clean water?
- No. Secchi measures how far a disk stays visible. A clear lake can still have bacteria, toxins, or contaminants this catalog does not grade. Open a lake page for the authority's values.
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Named lakes and official measurements
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