To ask the Secretary of State for Scotland (1) if he will list the numbers, percentages and locations of long sea sewage outfalls; and what are the quantities of treated and untreated sewage discharged at each location;(2) if he will list the numbers, percentages and locations of sewage outfalls which discharge at or above the low water mark; and what are the quantities of treated and untreated sewage discharged at each location.
There are approximately 800 local authority sewage outfalls in Scotland which discharge directly to estuaries or coastal waters. The detail sought is too lengthy for inclusion in the Official Report. A summary is, however, contained in the technical report "Sewage Works and Discharges Archive Report 1987" produced by the Scottish Development Department, a copy of which is in the Library.
To ask the Secretary of State for Scotland if he will provide figures showing the total quantities of treated and untreated sewage discharged into the sea off the Scottish coast.
In 1985, the latest year for which published information is available, approximately 755,000 cu m per day of sewage was discharged to Scottish estuarine and coastal waters. Of this, around 290,000 cu m per day was untreated and around 146,000 cu m per day received preliminary treatment. The balance received at least primary treatment.