Stagnant monsoon water is turning into a growing health concern in Ulhasnagar, where 30 suspected dengue cases have been reported by private laboratories. Municipal health teams are stepping up inspections of homes and neighbourhoods, targeting uncovered water tanks, discarded tyres, flower pots and other places where mosquitoes can breed. Poor drainage, potholes and leaking pipelines have added to waterlogging, while officials are also watching for malaria, chikungunya, typhoid and diarrhoea. Residents are being asked to empty and clean water containers at least once a week - a small routine that could prevent a much bigger problem.