The water was allegedly supplied by a tanker to the private Kasturbai Ashram school in Tavkheda village.
The students upon drinking the water started vomiting and complained of diarrhoea on the night of July 16.
A medical team from Dhule civil hospital rushed to the school and provided treatment to the affected students, who were in the age group of 8 to 12 years. Two of the children who were taken ill were admitted to hospital.
Dhule collector Prakash Mahajan and zila parishad chief executive officer Anil Landge also visited the school, police added.
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