Lagoon Sludge Removal Project Update – Aeration System Trial - September 11, 2026

Staff continue to monitor conditions at the wastewater lagoon following the start of the aeration system trial on September 8.

Strong odours occurred during start-up and affected areas including Bruce Avenue and the Stonehaven subdivision. Odours improved within approximately 24 hours, and a sodium nitrate application on Wednesday has helped reduce impacts. Noticeable odours are now primarily limited to the area close to the lagoon site.

Handheld air quality testing continues around the site. Some readings were recorded near the lagoon during start-up, which was anticipated following the three-month shutdown. No readings indicated an alarm or serious condition, and testing along the lagoon perimeter found no readings of concern. Daily monitoring has also identified no ongoing air quality concerns.

Dissolved oxygen (DO) levels and site conditions have not yet improved significantly. This is expected at this early stage of the trial, with more noticeable changes anticipated around days 7 to 14.

Staff will begin collecting samples next week to assess treatment effectiveness and removal rates with the aeration system operating. A second sodium nitrate application is available if odour conditions worsen.

A small number of odour complaints have been received, but overall, the system is operating as expected. 

The aeration system trial is expected to continue for approximately 14 to 21 days.

Updates on the Lagoon Sludge Removal Project will be posted every Tuesday and Friday throughout the aeration trial. Residents can also subscribe to receive project updates directly to their inbox.

Contact the Project Team