degradation of the lake's water quality has been ongoing; however, with the elimination of domestic waste discharges 20+ years ago, the water quality has shown improvement. eutrophication continues as a result of continued discharges of stormwater and agricultural and yard/street runoff. more than two dozen stormwater outfalls are situated within 1000 ft of lake osborne. in addition to the lake’s loss of habitat value due to urban and residential growth, there has been significant establishment of exotic vegetation, fish, and molluscan species that have disrupted the lake’s ecosystem function.