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The quantity of pollutants discharged from sewage treatment plants into surface water has risen over the last two years, having previously fallen for many years.

Urban waste water treatment plants: number and capacity, influents, effluents and sewage sludge; results by province and river basin district

In 2022, Dutch sewage treatment plants processed 1.81 billion m3 of sewage water, the equivalent of more than 70 thousand Olympic-sized swimming pools filled with water.