Dissolved nitrogen in drinking water resources in Al-Mahareth village of Assir - Saudi Arabia.

A water quality study was carried out on ground water wells, which serve as drinking water sources in farming communities in Al-Mahareth village of Assir region of the Kingdom of Saudi Arabia. The objective of this research was to determine concentrations of different forms of nitrogen in drinking water samples. Water samples were collected from these sources every 3 months (from January to December 2008) and analyzed for ammonia, nitrate and nitrite using the Plaintest Photometer Method. Results indicated that the annual mean concentration of nitrate, nitrite and ammonia varied from 23.09 to 25.06 mg/l, 0.006 to 0.36 mg/l and 0.008 to 0.179 mg/l, respectively. An important observation was that, in general, higher nitrate and nitrite concentrations were found during the rainy season compared to the dry season. Concentrations of these potentially toxic substances were below WHO acceptable limits for surface and ground waters, indicating that these water resources appear safe for drinking from a dissolved nitrogen perspective.