Objective To further strengthen drinking water monitoring in Yinchuan and establish a sound municipal drinking water monitoring network.
Methods During 2008-2011, the hygienic quality of drinking water in Yinchuan was monitored according to related monitoring requirements. Samples of drinking water in pilot spots of the municipal monitoring network were collected for statistical analysis.
Results Of the 1 222 water samples collected, 691 were qualified in accordance to the national standards of drinking water quality, and the qualification rates in 2008, 2009, 2010, and 2011 were 44.74%, 51.85%, 58.96%, and 67.78%, respectively (χ2=819.643, P<0.01). The qualification rates of samples of finished water and tap water from public water plants, secondary water supply, finished water and tap water from private owned water plants were 35.00%, 63.53%, 55.37%, 40.74%, and 26.15%, respectively (χ2=79.433, P<0.01). Of the various water samples, there were significant differences in turbidity (χ2=42.839, P<0.01), smell and taste (χ2=50.883, P<0.01), iron (χ2=104.446, P<0.01), manganese (χ2=23.864, P<0.01), ammonia (χ2=354.108, P<0.01), chlorine (χ2=53.272, P<0.01), total bacterial count (χ2=10.719, P<0.05), and total coliforms (χ2=16.321, P<0.01). Statistical differences were also found in the qualification rates of water samples collected from Xingqing District (51.56%), Jinfeng District (61.79%), and Xixia District (68.93%) (χ2=23.409, P<0.01).
Conclusion The drinking water quality in Yinchuan is hardly satisfied and need strengthened monitoring.
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