ISD fees
As consumers in the ISD system the fees you pay each year on your property taxes are divided into three separate categories: Trunk Line Capacity Fee (TLC), Plant Capacity Fee and User Charge Fee.

ISD periodically adjusts User Charge Fees based on the consumer price index (CPI). The following prices will be in effect for the 2011-12 fiscal year.

The monthly User Charge Fee shall be equal to the total number of equivalent service units and as of July 1, 2011, is $49.33.

These rates are comparable to fees that other districts in East Contra Costa County charge. Some communities send monthly bills with sanitary district fees to residents. Oakley fees are collected each year on property taxes.

While the User Charge Fee is charged annually on residential taxes, the TLC, currently at $854.00 per equivalent service unit, and the Plant Capacity Fee, currently at $4,442.30, is paid one time when permits are taken out for new construction.