Hokkaido, Japan
County page for 10 named lakes in Japan. 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 |
|---|---|---|---|---|---|
| 佐幌ダム貯水池 | Hokkaido | 10 µg/L | — | 3.7 m | 2024 |
| 倶多楽湖 | Hokkaido | 3.0 µg/L | — | 17 m | 2024 |
| 屈斜路湖 | Hokkaido | 6.0 µg/L | — | 8.3 m | 2024 |
| 支笏湖 | Hokkaido | 3.0 µg/L | — | 18 m | 2025 |
| 春採湖 | Hokkaido | 42 µg/L | — | 0.8 m | 2024 |
| 洞爺湖 | Hokkaido | 3.0 µg/L | — | 13 m | 2024 |
| 然別湖 | Hokkaido | 5.5 µg/L | — | 5.3 m | 2025 |
| 糠平ダム湖 | Hokkaido | 10 µg/L | — | 3.2 m | 2024 |
| 網走湖 | Hokkaido | 79 µg/L | — | 0.7 m | 2025 |
| 阿寒湖 | Hokkaido | 27 µg/L | — | 3.8 m | 2025 |
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