Length of poor and seriously polluted rivers
Between 1999 and 2006, the length of "poor" and "seriously polluted" rivers in Scotland fell by 34% to 734 km, a reduction of 435 km. SEPA set a target of a reduction of 351 km in poor and seriously polluted rivers for the period 1999-2006. Poor biological and nutrient quality are the most frequent reasons for classifying rivers as "poor" or "seriously polluted".

Source: Scottish Environment Protection Agency
Further Information
Last updated: September 2007