Ladysmith Harbour, supporting a moderate amount of industrial, commercial, and recreational activities, is potentially affected in terms of water quality from a number of sources. One such source is the Ladysmith sewage treatment plant (STP). Presently, the STP's effluent is meeting permit levels for B.O.D. and T.S.S. However, rainbow trout bioassays indicate the effluent to be toxic. Ammonia levels, and B.O.D. are likely key factors contributing to the effluent toxicity. Dissolved oxygen levels are depressed in the lower depths of the Harbour. Macoma bioassays indicated toxicity in the sediment, with neither of the sample sets surviving the test. Continued monitoring should be performed throughout the year. Improving the water quality of Ladysmith Harbour and removing the shellfish closures currently in effect are of prime concern.
Hansen, Debbie. 1993. Investigations of the Environmental Impact of the Ladysmith Sewage Treatment Plant on Ladysmith Harbour. BC Ministry of Environment, Lands and Parks