The costs are based on water consumption. The department of public works receives consumption information from the water company. It then takes the two lowest quarters, multiplies by two, and then by the rate of $4 for every 100 cubic feet consumed. The bill covers a year in advance based on the previous year’s usage. If someone has a private well for water but is on the sewer system, they are charged the average of residential users. A meter can be installed on the well at the homeowner’s request and then the bill would be adjusted and based on the meter reading. Homeowners with a question about their bill are encouraged to call the sewer commission at 203-656-7331. Abnormal charges can indicate a water break.