Lakes in Val-d'Oise, France
Find lakes in Val-d'Oise: county page for 1 named lakes in France. 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 |
|---|---|---|---|---|---|
| Plan D'Eau de la Base de Plein Air Et de Loisirs de Cergy | Val-d'Oise | — | 1.0 µg/L | 3.9 m | 2025 |
Frequently asked questions
- How many named lakes are in Val-d'Oise?
- 1 named lakes in Val-d'Oise, France, have official chlorophyll-a and Secchi, 2025. Values are measurements, not a LakeQuality A–F grade.
- Does LakeQuality grade lakes in Val-d'Oise?
- No. Val-d'Oise pages show official phosphorus, chlorophyll-a, and Secchi from the publishing authority. A letter on the LakeQuality scale would be an invention.