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Sewage can enter freshwater systems through various pathways, including improper disposal or treatment of wastewater, overflow from sewage treatment plants, and leaks from aging infrastructure. Stormwater runoff can also carry untreated sewage from combined sewer systems during heavy rainfall. Additionally, illegal dumping and agricultural runoff containing animal waste can contribute to the contamination of freshwater sources. Once in the water, sewage introduces harmful pathogens and nutrients, degrading water quality and posing health risks.

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