The Acton WWTP discharges into Black Creek, a coldwater creek similar to the West Credit River. Data collected by the Coalition show that the Acton WWTP makes Black Creek warmer in the summer and that the effluent remains warm into the fall.
Ontario’s Water Quality objective for effluent temperature is out of date and ineffective. Other jurisdictions protect Brook Trout with specific temperature limits. Why can’t Ontario do the same?
Effluent temperatures is influenced by air temperatures. As the air temperature increases effluent temperature increases. The hottest effluent temperatures occur after consecutive hot days.
Effluent temperatures from 5 southern Ontario wastewater treatment plants in the summer of 2021 were above the 19 °C effluent discharge temperature assumed in the Erin Wastewater Treatment Plant Environmental Study Report (ESR).
Why the Coalition for the West Credit River is worried about thermal impacts of the Erin Wastewater Treatment Plant.
Erin Wastewater Treatment Plant was not designated under the Impact Assessment Act. The areas of federal jurisdiction will be addressed by Provincial regulation and mitigation such as those in the Environmental Compliance Approval process.
Facts about the proposed Town of Erin Wastewater Treatment Plant, its environmental impacts and the Environmental Study Report completed for the Class EA.