The City of Chicago issues water bills on a bi-monthly basis. Sometimes, estimated readings are used to calculate water usage when an actual reading has not been taken.
When the city doesn't take an actual meter reading for a long time, however, you could find that you are overpaying for water or worse, underpaying and subject to a large bill sometime in the future. This can create major cash flow problems for your association.
Check your bills for estimated readings and contact the city to arrange for an actual reading if necessary. You shouldn't be paying for any more (or less) water than you are actually using.