With 16.89 lakh flood-affected people, Muzaffarpur is the worst-hit district, followed by 12.40 lakh people in Darbhanga and 8.09 lakh in East Champaran.
More than half of the affected populace live in Muzaffarpur and Darbhanga districts.
Of the 13 deaths in flood-related incidents, Darbhanga registered the highest seven casualties, followed by four in West Champaran and two in Muzaffarpur.