Possible Clues:

• Pollution caused by a Channel Islands sewer
• Impure water in a Channel Islands duct
• Certain environmental concern
• Form of precipitation containing pollutants
• Devastating drop of a sewer in Sark?
• Low-pH precipitation
• Cloudy issue of pollution
• Number to help out with sound rule for pollution
• Water good for burns?
• A group of detectives managed to include one with precipitation being polluted