杭州市联合调查组发布余杭区部分小区供水异常调查情况通报

Core Viewpoint - The investigation into the water supply abnormalities in Yuhang District, Hangzhou, revealed that the issue was caused by a combination of environmental factors, including high temperatures and algal blooms, leading to the presence of sulfur compounds in the water supply [1][17]. Water Quality Abnormality Investigation - The joint investigation team found that the detected sulfur compounds in the water caused unpleasant odors, which were linked to algal blooms in the upstream water sources due to prolonged high temperatures [1]. - The investigation confirmed that the water quality issues were exacerbated by the influx of algal degradation products into the water supply system [1]. Emergency Response Measures - The emergency response began on July 16, with the Yuhang Water Supply Company detecting unusual odors in the water at 8:00 AM [3]. - Water source switching was initiated promptly after the detection of abnormal odor levels, with the first tests showing a level 3 odor and taste anomaly [4][5]. - By 1:30 PM on the same day, the water quality indicators showed signs of recovery, and the main pipeline flushing was completed by 4:30 PM [6][7]. Water Quality Testing Results - Initial tests indicated that while the odor and taste were abnormal, no harmful bacteria were detected in the water supply [14]. - Subsequent tests confirmed that after switching water sources, all water quality indicators met national standards, including the absence of sulfur compounds [14][15]. Accountability and Response Issues - The investigation highlighted several shortcomings in the emergency response, including delays in notifying affected users and inadequate execution of emergency plans by the Yuhang Water Supply Company and related authorities [16][17]. - A total of seven officials were held accountable for their roles in the inadequate response to the water quality crisis, with various disciplinary actions taken against them [18]. Community Support and Assurance - In response to community concerns, local authorities initiated measures such as free water quality testing, health monitoring, and the replacement of affected water filter cartridges [19]. - The government expressed apologies for the inconvenience caused and committed to improving water safety measures and emergency response capabilities in the future [19].