Collinsville residents will pay an additional 13 cents per month for garbage disposal on their 2014 water and sewer bills.

The increase is a contractual obligation between the city and Allied Waster, the parent company of Republic Services. The rate must increase based on the Consumer Price Index, which increased by 1 percent as of Oct. 31, 2013.

The 26 cents per bill increase will arrive on the same bill that will reflect the 38 percent water rate increase.