How do combined sewer overflows affect water quality in Philadelphia?
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https://phys.org/news/2026-10-combined-sewer-affect-quality-philadelphia.html
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In Philadelphia and many urban areas across the U.S. with sewer systems dating back to the 1800s, more frequent flooding is posing a threat not only to people and property but also to surrounding ecosystems. In these areas, stormwater and sewage drain into the same pipes, which are designed to spill into nearby waterways when flooding occurs rather than inundating streets.
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