Pittsburgh’s leaky faucet: How aging sewers are impacting urban watersheds

ScienceDaily: Aging sewer systems are spilling a considerable amount of nitrogen into urban watersheds, diminishing both the quality of water and ecosystems' habitats. However, many studies documenting the impacts of nitrogen on urban environs have not properly estimated the contribution of leaky sewer systems -- until now. Using water samples from the Pittsburgh-based Nine Mile Run watershed, a Pitt research team reveals in the current issue of Environmental Science & Technology that an estimated 10 to 20......

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