Water quality continues to be impaired due to unfavourable hydrological conditions rainfall, high flow velocity, low solar radiation, temperatures below the seasonal norm and pollution in the upper reaches of the river.
The data showed that bacteria such as enterococci and E. coli remained well above legal limits at all four test sites along the river.
Paris has invested 1.4 billion ($1.5 billion) in wastewater treatment plants and sewer system in the greater city area to clean up the Seine for swimming.
Paris mayor's office highlighted that water pollution levels spike during heavy rain, and better weather is hoped for to improve water quality.
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