Saitama, Japan
County page for 3 named lakes in Japan. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| 下久保ダム貯水池 | Saitama | 14 µg/L | — | 3.0 m | 2025 |
| 二瀬ダム貯水池 | Saitama | 11 µg/L | — | 0.8 m | 2025 |
| 荒川貯水池 | Saitama | 47 µg/L | — | 0.6 m | 2025 |
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