Department of Infection Control and Preparedness, Norwegian Institute of Public Health, Oslo, Norway E-mail:
J Water Health. 2021 Oct;19(5):872-884. doi: 10.2166/wh.2021.141.
The issuing of boil water advisories (BWAs) is a widely used response to microbiological contamination events in drinking water supply systems, and may therefore serve as an indicator for the access to safe drinking water. To supplement data source on the overall status of water supply systems (WSSs) in Norway, we analysed public media reports published in Norway to assess trends, causes, geographical and seasonal distribution of BWAs issued during the period 2008-2019. We identified 1,108 BWA events increasingly reported over the study period but characterised by a decreasing trend in time with respect to duration. The two main frequent causes for BWA were detection of faecal indicator bacteria (42.6%) and risk of contaminants intrusion in the distribution system (21%). We observed higher reporting rates in summer and autumn compared with winter, and higher reporting rates in Northern and Eastern Norwegian regions compared with the Central region. The results of this study could serve as supplementary information to better understand the overall status among WSSs in Norway, particularly in case of recurrent BWA's events, as well as suggest the relevance of BWAs' monitoring in identifying risk factors and planning targeted interventions.
发布沸水警报（BWA）是应对饮用水供应系统中微生物污染事件的常用措施，因此可以作为获取安全饮用水的指标。为了补充挪威供水系统（WSS）总体状况的数据来源，我们分析了在挪威发布的公共媒体报告，以评估 2008-2019 年期间发布的 BWA 的趋势、原因、地理和季节性分布。我们确定了 1108 起 BWA 事件，这些事件在研究期间报告的次数不断增加，但在时间上呈下降趋势，持续时间也在缩短。BWA 的两个主要常见原因是粪便指示细菌的检测（42.6%）和污染物进入分配系统的风险（21%）。我们观察到与冬季相比，夏季和秋季的报告率更高，与中部地区相比，挪威北部和东部地区的报告率更高。本研究的结果可以作为更好地了解挪威 WSS 总体状况的补充信息，特别是在反复出现 BWA 事件的情况下，还表明 BWA 监测在识别风险因素和规划有针对性的干预措施方面具有相关性。
