Ailsa Craig Wastewater Treatment Plant - North Middlesex, Ontario

The Ailsa Craig Wastewater Treatment Plant is located in the community of Ailsa Craig within the municipality of North Middlesex, Ontario, Canada. This facility serves a population of 1,354 residents, making it a small-scale municipal treatment plant in rural southwestern Ontario. The plant operates with secondary treatment, which is the standard level required under Canadian provincial regulations for communities of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant discharges approximately 608 cubic meters of treated wastewater per day. The treated effluent from the plant is released into the local watershed, which ultimately drains into Lake Huron via the Ausable River system. This connection to the Great Lakes basin underscores the plant's role in protecting downstream water quality and the broader Lake Huron ecosystem.

The plant discharges into the Ausable River watershed, which flows into Lake Huron, one of the five Great Lakes. Lake Huron supports diverse aquatic life, including fish species such as lake trout and walleye, and provides drinking water for millions. The secondary treatment helps reduce nutrient loading, which is critical to prevent algal blooms in the lake.