Investigation and analysis of rural drinking water nitrate pollution in Donggang District,Rizhao City

Objectives To understand the distribution of nitrate in different types of water in our district and provide evidence for a need to improve water quality and water quality control in the rural area.Methods Surface water of 25 small central water supply systems(including source water and tap water) and tap water of 40 wells were collected.Monitoring and statistical analysis were performed.Results Among all types of rural area water in 2013,well water had the highest nitrate content.The average nitrate content was 15.6 mg / L,close to the ≤20mg / L standard for daily drinking water middle and small-sized central water supply systems(GB 5749-2006).The failure rate standard is ≤20.00%.Among the 90 water samples,12 failed to meet the standard,a failure rate of 13.33%.Though it is a water source,surface water had a similar nitrate content to tap water.Water treatment yielded an average nitrate removal rate of 0.49%.Conclusion The nitrate content of all types of water was excessive.Water sources should be carefully selected and water management should be strengthened.