Numerical Assessment of Water Quality Using Quality Control - A Case Study of Idah, Kogi State, Nigeria

This research seeks to apply "numerical assessment of water quality using quality control - A case study of Idah, Kogi state, Nigeria.” Secondary data of 500 bags of Idah factory water produced over period of 23 days were analyzed using control chart for fraction and number defectives to monitor the proportions of defective and number of defects in the factory water. It was found using P-CHART that central line (CL), upper control limit (UCL) and lower control limit (LCL) were 0.04, 0.07, and 0.01 respectively. Similarly, the result obtained using NP-CHART in monitoring number of defects in Idah factory water production indicated that , lower control limit (LCL), central line  and  upper control limit (UCL) were 8, 22 and 36 respectively. In both cases all the points were within the control limits. This implies that the production process is in a state of statistical control. It was therefore, recommended that the current components of the production process should be sustained among other things.