Chemical analysis of drinking water household storage tanks confirmed the level of pH with values ranging from 5.6 to 7.8, with an average value of 7.3, chlorides concentration ranging from 32.3 to 100.4 mg/l with an average value of 74.6 mg/l and nitrate concentration ranging from 6.2 to 62.7 mg/l with an average value of 45.3 mg/l.