The Town of The Blue Mountains would like to inform the public of a temporary partial bypass that occurred at the Thornbury Wastewater Treatment Plant on March 6, 2025. Between 8:00 a.m. and 10:30 a.m., a failure in the Ultraviolet (UV) Disinfection equipment resulted in treated effluent bypassing the UV disinfection stage before being discharged to the Beaver River at the Bay Street East outfall.
The Town’s Wastewater Operators have repaired the system and restored UV disinfection treatment. During the bypass event, effluent was still receiving secondary treatment which includes the removal of biodegradable organic matter and suspended solids. Wastewater Operators performed sampling of the bypassed effluent to ensure it was within normal quality limits under the Town’s Environmental Compliance Approval. Grey Bruce Public Health and The Ministry of the Environment, Conservation and Parks have been notified of the event. Staff have no concerns about any threats to public health or environmental impacts.
For more information, please contact:
Town of The Blue Mountains
Manager of Water and Wastewater Services
(519) 599-3131 ext. 226
