The River Quality Objectives (RQO) classification was used for planning water quality improvements until 2006 when the scheme ended. RQOs were assigned to all significantly sized rivers (based on river flow). Chemical samples were taken 12 times a year. Any river quality failures, their reasons and actions to be taken, were stored in separate tables. The national RQO classification scheme ceased at the end of 2006, it is now a fixed table which will not be updated.

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