Core Insights - The central ecological environment protection inspection team has identified significant issues in the urban sewage collection and management in Wuzhong City, Ningxia Hui Autonomous Region, leading to untreated sewage discharge into the Yellow River [1][2] Group 1: Environmental Issues - Wuzhong City has a total of 510 kilometers of drainage network, of which 402 kilometers are combined rain and sewage systems, with no progress on the required separation reform [1] - During the rainy season from 2023 to 2024, there were 23 instances of sewage overflow, with the first sewage treatment plant discharging approximately 1.2 million cubic meters of sewage into the Yellow River, exceeding surface water quality standards significantly [2] - The concentrations of chemical oxygen demand, ammonia nitrogen, and total phosphorus in the discharged sewage were 15.3 times, 21.7 times, and 20.5 times higher than the Class III surface water quality standards, respectively [2] Group 2: Management and Infrastructure - The inspection team pointed out that the management of urban environmental infrastructure in Wuzhong City is inadequate, with responsibilities for sewage collection network construction not being fulfilled [2] - There were multiple instances of sewage overflow from the second and third sewage treatment plants, with the second plant discharging around 360,000 cubic meters and the third plant nearly 100,000 cubic meters into the Yellow River [2] - The inspection team will conduct further investigations and ensure follow-up inspections are carried out as required [2]