Bangalore Water Supply & Sewerage Board [Bwssb] — arrears amount in bill

Address: 560016

Hi team,
I want to know about the amount which is given in arrears tab of every month bill. Every month we are paying some amount of money which is given as arrears in the water bill. Since all bills are paid monthly what is the arrears amount indicate? Can we get valid reason for paying arrears for every month? What is the need of arrears in water bill?
E-331015