The BMC said Mumbai receives 3,950 MLD water every day from seven reservoirs located in Thane and Nashik districts. The water is brought to the city in 150-km-long pipelines and distributed to households after the purification process. "The annual water tariff is determined by calculating all the infrastructure costs, maintenance and repairs, royalty charges, water purification and disinfection process, electricity costs, and establishment costs etc," it said.