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UWWTP Haarlem Schalkwijk serves approximately 51,617 people in Haarlem, Netherlands. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
UWWTP Haarlem Waarderpolder serves 161,250 people in Haarlem, Netherlands. Located in Noord-Holland, it operates under the EU Urban Waste Water Treatment Directive, which mandates advanced treatment for large agglomerations.