Sewage Management River Seine Seine River River Pollution E. coli Wastewater Management Rivers Public Health River Cleanup Health Risks E.coli Sewage Systems Event Impact Urban Development Sewage Contamination River Health Nutrient Pollution Sewage Pollution Ecosystem Restoration Environmental Impact Freshwater Systems Recreational Water Yamuna River Lead in Water Regulation Illegal Discharges Chemical Treatment Beach Safety Waste Management Ganga River E. coli Levels Sewage Overspill