mojtaba sayyadi

Monitoring and controlling water resources and using health risk assessment approaches for water pollutants are essential for health promotion programs. This study aims to determine the water quality status and its spatiotemporal variation across the Kan River Basin, explore the interrelationship between surface and groundwater quality indices, and assess the nitrate health risk in drinking water.

The water quality index (WQI) was calculated based on the guideline of the Iran Environmental Protection Organization, and spatiotemporal distribution maps were prepared using ArcGIS in 2020. To determine the correlation between IRWQISC and IRWQIGC indices, Spearman's non-parametric test was applied. Furthermore, Hazard Quotient (HQ), Excess Lifetime Cancer Risk (ELCR), and Monte-Carlo Simulation techniques were used to determine the carcinogenic and non-carcinogenic risks of nitrate in three age groups.

The water resources were classified into three groups of medium quality, relatively good, and good during the study period. All parameters complied with the Iranian water quality standards. Furthermore, the statistical analysis revealed no significant relationship between the surface and groundwater quality indices. The calculated HQ values for infants, children, and adults were 0.661, 0.620, and 0.236, respectively. The ELCR values for infants, children, and adults were 1.06 × 10-4, 0.99 × 10-4, and 0.38 × 10-4, respectively, which, for the infants' group was higher than the guideline limit of the United States Environmental Protection Agency (USEPA) (10-4).

The water resources are suitable for drinking purposes. However, more attention is needed to prevent water contamination in the coming years.

The growing trend of development and various human activities leads to the entry of various pollutants into groundwater. The desirable physical and chemical quality of water is critical to the consumer, consumer health and maintenance of the water supply system. Currently, one of the problems of underground water sources is the pollution of drinking wells and other underground resources to urban and industrial wastewater, which leads to a change in the water quality of these resources and makes it impossible for them to drink. This study investigated and zoned elements Different qualitative water flows within the city of Jajroud Basin's city by Arc GIS software. For this purpose, water quality parameters were sampled from all the sources used in drinking water in this area. Then all the information was entered into the software environment under descriptive layers and to produce qualitative zoning maps. These maps show a significant trend for most parameters, due to the widespread use of water and the probability of the outbreak of various diseases Concerned about drinking in this area, this research could pave the way for future decisions on correct water harvesting in the study area.