Between May and December last year, the Environment Agency received five complaints about a tributary of the Connon Stream near Liskeard, Cornwall, running milky white. In each case, the pollution was traced to the LAWDC's Connon Bridge landfill site.
The LAWDC was warned about the pollution on each occasion - and eight more times following routine inspections.
On New Year's Day, the Agency received another complaint about the stream being discoloured. Officers traced the pollution, which lasted for 500 metres, to an overflowing sediment lagoon within the landfill site.
Appearing before East Cornwall magistrates on 7 July, the LAWDC pleaded guilty to causing polluting matter to enter controlled waters, contrary to sections 85(1) and 85(6) of the Water Resources Act 1991. It was fined £12,000 and ordered to pay £1,885 costs.