Wastewater System - Drumbo
The County maintains a diverse portfolio of assets that are required to provide the community of Drumbo with the safe collection and treatment of wastewater. The Drumbo Wastewater Treatment Plant (WWTP) provides wastewater treatment for residential, commercial, and industrial users in the Village of Drumbo.
The wastewater collection network transports residential, commercial, and industrial waste to the WWTP for treatment. The wastewater collection network consists of a mix of gravity mains, low pressure mains and forcemains. Wastewater flows by gravity wherever possible, where changing elevations require the use of sewage pumping stations (SPS). Other specialized structures such as manholes, valve vaults, meter stations, diversion structures and siphons are required to convey wastewater to the WWTP.
Inventory
| Asset Component | Unit | Current Inventory | Replacement Cost |
| Wastewater Treatment Plant | site | 1 | $2,520,276 |
| Sanitary Pumping Station | bldg | 2 | 903,813 |
| Other Facilities | bldg | 1 | 14,886 |
| Equipment | total | N/A | 2,269,942 |
| Sanitary Main (<450mm) | metre | 8,742 | 6,374,324 |
| Sanitary Service Connection | each | 408 | 1,871,904 |
| Total Replacement Cost | $13,955,145 | ||
The replacement cost valuation for the linear assets in this portfolio are based on current tender prices, where available. The replacement cost valuation for wastewater vertical is based on the latest information available, which includes current replacement costs, insurance valuations, inflation, and valuations from studies / assessments completed in prior years.
Condition
The assessment approach for our wastewater assets utilizes a combination of physical assessments, asset attributes, such as material and sizing, as well as established anticipated useful lives.
The percentage of assets in poor or critical condition has increased from 9% as reported in the 2022 AMP to 17%. The percentage of assets in good or excellent condition has decreased from 67% as reported in the 2022 AMP to 63%. As assets continue to age their condition rating will decline until lifecycle strategies are triggered and completed.
Key Performance
| Key Service Attribute | LOS Statement | Performance Measure | 2022 | 2023 | Target |
| Reliability | Providing wastewater services with minimal interruptions | % of properties within the system boundary connected to the municipal wastewater system | 98% | 98% | TBD |
| The number of connection-days per year due to wastewater backups compared to the total number of properties connected to the municipal wastewater system. | 0 connection-days to 338 connections | 0 connection-days to 341 connections | TBD | ||
| Environmental Stewardship | Providing wastewater services that have minimal impacts on the environment | The number of effluent violations per year due to wastewater discharge compared to the total number of properties connected to the municipal wastewater system. | 7 violations to 338 connections | 11 violations to 341 connections | 0 |
Funding Gap Analysis
This portfolio is currently funded through an annual contribution to the Wastewater - Drumbo reserve, by wastewater rates in Drumbo, along with an annual allocation of interest earned.
The graph illustrates the anticipated asset management needs (expenditures) and anticipated funding for the 10-year period of 2024-2033, reflecting an approximate $14,000 surplus in funding availability over the period.
Upon completion of the Wastewater Treatment Plant capacity expansion project a long-term debenture will be required for the costs funded by the existing system, and the costs that are eligible for Development Charge funding. Increases to rates will be required to ensure the existing system debenture obligations are met. Subdivision development will commence at the completion of the project bringing additional revenue to assist with meeting these obligations. The system is anticipated to operate at break-even or below for several years, with no reserve balance. This adds risk to the sustainability of the system in the near term, as unanticipated events would likely result in the need for additional borrowing. The long-term sustainability of this system will be monitored closely for several years.