It was updated in 2022-23 based on successive budgets in 2019 and 2020. The formula now reflects 100% of costs for operating and maintaining water and waste-water facilities.
This formula also takes into consideration modernized indices, including city centre or remoteness. It takes into consideration all the needs of and requirements for operating a water treatment plant, including operator salary, electricity, parts, chemicals and everything required throughout the whole water treatment plant and distribution system.