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UWWTP Numansdorp serves about 14,000 people in Numansdorp, Zuid-Holland, Netherlands. The plant is located within 50 km of the coast and discharges into the local water system.
UWWTP Piershil serves 4,700 people in Piershil, Zuid-Holland, Netherlands. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.