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目的了解北京市西北部山区生活饮用水水质情况及变化趋势,为进一步改善水质、保障水质安全提供科学依据。方法收集2013—2015年生活饮用水水质监测资料,对农村饮水、二次供水、市政末梢水资料进行汇总、分析。结果 3年总体合格率为69.5%,2015年合格率较2013、2014年有明显提高(P<0.05)。3年均为农村水合格率最低(31.5%、33.6%、38.3%)。不同指标的合格率差异有统计学意义(P<0.05),且微生物指标合格率最低(73.0%)。枯水期合格率(65.8%)总体高于丰水期(50.5%),差异有统计学意义(P<0.05),感官和一般化学指标、微生物指标均为枯水期合格率高于丰水期,差异有统计学意义(均P<0.05)。结论北京市西北部山区饮用水水质仍有较大提升空间,尤其应加强农村水监管,保障水质安全。
Objective To understand the water quality and trend of domestic drinking water in the mountainous area of northwestern Beijing, and to provide a scientific basis for further improving water quality and ensuring water quality safety. Methods Collect drinking water quality monitoring data from 2013 to 2015 and collect and analyze rural drinking water, secondary water supply and municipal water information. Results The overall pass rate in 3 years was 69.5%. The pass rate in 2015 was significantly higher than that in 2013 and 2014 (P <0.05). In the three years, the qualified rate of rural water was the lowest (31.5%, 33.6%, 38.3%). There were significant differences in pass rates between different indexes (P <0.05), and the lowest passing rate of microbial indicators (73.0%). The passing rate in low water period (65.8%) was generally higher than that in wet season (50.5%), and the difference was statistically significant (P <0.05). The sensory and general chemical indexes and microbial indexes were all higher in dry season than in wet season Statistical significance (all P <0.05). Conclusion The water quality of drinking water in mountainous area in the northwestern part of Beijing still has more room for improvement. In particular, water regulation in rural areas should be strengthened to ensure water quality and safety.