Analysis on Drinking Water Quality Monitored in 2010-2013 in Nanping

Objectives To understand the hygienic quality of drinking water in Nanping city, to protect the safety of drinking water.

Methods Based on Standards for Drinking Water Quality (GB 5749-2006), the result of 3 677 drinking water samples monitored in 2010-2013 were analyzed and evaluated.

Results The average pass rate of 228 finished water samples collected from waterworks in the city was 82.89%, and the pass rate in 2010, 2011, 2012 and 2013 was 85.09%, 72.88%, 87.93 and 85.97%, respectively. The unqualified indexes were pH, iron, manganese, aluminum, and micro-organisms. The average pass rate of 717 peripheral water samples in the urban area was 73.92%, and the pass rate in each year was 71.20%, 57.72%, 71.2% and 87.93%, respectively; the unqualified indexes were free residual chlorine, pH, iron, manganese and micro-organisms.The average pass rate of 2 732 water samples collected from rural drinking water safety projects was 37.23%, and the pass rate in each year was 30.00%, 38.26%, 30% and 45.45%, respectively, which was improved in an upward trend; the unqualified indexes were free residual chlorine, pH, iron, manganese and micro-organisms.The difference of pass rate in different years was statistically significant (χ²=26.56, P < 0.05).The quality of water from urban waterworks (82.89%) was higher than that from rural drinking water safety projects (37.23%, χ²=181.79, P < 0.01).

Conclusions The quality of drinking water in Nanping city could meet the requirement of GB 5749-2006; the main reason of lower water quality in rural drinking water safety projects was microbial contamination.The construction of rural drinking water safety projects should be strengthened. Strengthening hygienic management and supervision, prevention and control of microbial contamination of drinking water, to safeguard the safety of public drinking water.