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Chamber and committees

Question ref. S6W-10252
Asked by: Maurice Golden, North East Scotland, Scottish Conservative and Unionist Party
Date lodged: 11 August 2022

Question

To ask the Scottish Government how many waste water treatment works (a) there are and (b) monitoring exercises (i) were carried out during the Chemical Investigation Programme 2 (CIP2) and (ii) are planned for CIP3, in each case broken down by local authority.

Current status: Answered by Michael Matheson on 7 September 2022


Answer

Scottish Water operates 1,857 wastewater treatment works (WWTW) across Scotland; this figure includes septic tanks.

Scottish Water works closely with the Scottish Environment Protection Agency (SEPA) to develop the Chemical Investigation Programmes (CIP). Phase 1 of the CIP2 Scotland project involved sampling at 20 low dilution WWTWs monthly over a period of 2 years. Phase 2 of the CIP2 Scotland project involved sampling at a further 24 WWTWs monthly over a 6 month period for substances identified of further concern. 4 septic tanks were sampled as part of CIP2 Scotland. CIP3 Scotland is sampling at 5 WWTWs for substances of emerging concern monthly over a year starting in June 2022. CIP3 Scotland will be sampling at 5 coastal WWTWs monthly for 6 months.

WWTWs were chosen due to their low dilution as these WWTWs pose the greatest risk of not achieving the Environmental Quality Standard where the substance is controlled by existing legislation or the Predicted Non Effect Concentration (PNEC) where there are no controls in legislation. Dilution varies according to the population served by a WWTW and the volume of water in the receiving watercourse.

The following table gives a breakdown of the WWTWs sampled in each Local Authority Area in Scotland.

Local Authority

Number of WWTWs in each Local Authority

WWTWs sampled in CIP2 Scotland phase 1

WWTWs sampled in CIP2 Scotland phase 2

Septic tanks sampled in CIP2 Scotland

Sampled in CIP3 Scotland for emerging substances

Sampled in CIP3 Scotland for emerging substances

Aberdeen City

7

     

Aberdeenshire

190

 

9

   

Angus

61

1

1

   

Argyll and Bute

149

 

1

   

City of Edinburgh

4

1

1

 

1

1

Clackmannanshire

6

     

Dumfries and Galloway

182

     

Dundee City

2

     

East Ayrshire

30

     

East Dunbartonshire

2

     

East Lothian

28

1

 

1

  

East Renfrewshire

3

     

Falkirk

11

     

Fife

61

2

2

  

1

Glasgow City

3

2

  

2

1

Highland

300

 

1

1

  

Inverclyde

1

     

Midlothian

13

2

    

Moray

63

 

1

   

Na H-Eileanan an Iar

171

     

North Ayrshire

33

     

North Lanarkshire

15

3

3

 

1

 

Orkney Islands

38

     

Perth and Kinross

91

1

    

Renfrewshire

3

     

Scottish Borders

98

 

1

   

Shetland Islands

81

     

South Ayrshire

22

     

South Lanarkshire

125

1

2

2

  

Stirling

38

1

    

West Dunbartonshire

4

    

2

West Lothian

22

5

2

 

1