The incident occurred at the firm's Redcar site last September. The National Rivers Authority (NRA) measured suspended solids at up to 1148mg/l and permanganate at 320mg/l in a discharge from the works. The limit for both determinands is 200mg/l.
British Steel told Teeside magistrates in February that it is "extremely environment conscious", and insisted that the breach was not due to a management error. Strong winds had stirred effluent