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UWWTP Cruquius in Haarlem, Netherlands, is a closed advanced treatment plant with a designed capacity of 810 m³/day. It served the local area before decommissioning.
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.