Parker Residential Limited on Ferryquay Street pleaded guilty to the offence which happened on 16 January last year.
Water Quality Inspectors (WQIs), acting on behalf of the Northern Ireland Environment Agency, inspected a tributary of the River Foyle at the entrance of St. Columb's Park and observed silt on the bed of the waterway.
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The WQIs proceeded to the construction site on Clooney Park West where they observed the site was wet and muddy, while a section of the roadway was flooded and used as a temporary wheel wash for vehicles.
The effluent was overflowing the roadway and running to a cracked concrete drain adjacent to the waterway. Approximately 400 metres of waterway was affected by the discharge.
A sample taken at the time of the incident confirmed that the discharge contained poisonous, noxious or polluting matter which was potentially harmful to fish life in the receiving waterway.
(CD/JP)
