Chiba, Japan
County page for 4 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 |
|---|---|---|---|---|---|
| 亀山ダム貯水池 | Chiba | 38 µg/L | — | 1.3 m | 2025 |
| 印旛沼 | Chiba | 130 µg/L | — | 0.4 m | 2025 |
| 手賀沼 | Chiba | 150 µg/L | — | 0.5 m | 2025 |
| 高滝ダム貯水池 | Chiba | 93 µg/L | — | 1.2 m | 2025 |
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