Devon and Cornwall, England
County page for 18 named lakes in England. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
Lake map
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Dores Pond | Devon and Cornwall | 33 µg/L | 9.1 µg/L | — | 2026 |
| Dozmary Pool | Devon and Cornwall | 70 µg/L | 17 µg/L | — | 2026 |
| Dozmary Pool Depth | Devon and Cornwall | 57 µg/L | 15 µg/L | — | 2026 |
| Fernworthy Reservoir Surface | Devon and Cornwall | 10 µg/L | 5.2 µg/L | — | 2023 |
| Gammaton Stream Lake | Devon and Cornwall | 18 µg/L | 11 µg/L | — | 2020 |
| Hawks Tor Reservoir | Devon and Cornwall | 13 µg/L | 2.6 µg/L | — | 2026 |
| Lower Slade Reservoir-Surface | Devon and Cornwall | 25 µg/L | 16 µg/L | — | 2020 |
| River Avon Lake | Devon and Cornwall | 9.6 µg/L | 1.7 µg/L | — | 2020 |
| River Tamar Lake | Devon and Cornwall | 72 µg/L | 17 µg/L | — | 2025 |
| Roadford Reservoir | Devon and Cornwall | 16 µg/L | 6.8 µg/L | — | 2020 |
| Slapton Ley Lake | Devon and Cornwall | 45 µg/L | 4.8 µg/L | — | 2026 |
| Stithians Reservoir | Devon and Cornwall | 13 µg/L | 6.9 µg/L | — | 2026 |
| Stithians Reservoir Sampling Buoy | Devon and Cornwall | 17 µg/L | 17 µg/L | — | 2020 |
| Stover Lake Surface | Devon and Cornwall | 44 µg/L | 6.1 µg/L | — | 2026 |
| The Loe Lake | Devon and Cornwall | 37 µg/L | 13 µg/L | — | 2026 |
| Trenchford Reservoir | Devon and Cornwall | 12 µg/L | 6.1 µg/L | — | 2026 |
| Upper Slade Reservoir Depth | Devon and Cornwall | — | 11 µg/L | — | 2024 |
| Venford Brook Lake | Devon and Cornwall | — | 5.4 µg/L | — | 2024 |
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