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The UWWTD requires secondary biological wastewater treatment and, therefore, the substantial removal of both biodegradable and nutrient pollution. In addition, in catchments with waters designated as sensitive to eutrophication, the legislation demands more stringent tertiary treatment to remove much of the nutrient load from wastewater. Consequently, in addition to higher collection rates, the UWWTD has also driven improvements in the level of wastewater treatment over recent years.