Grimshaw Wastewater Lagoon - Secondary Treatment Plant in Municipal District of Peace No. 135, Alberta

Grimshaw Wastewater Lagoon serves the Municipal District of Peace No. 135 in northwestern Alberta, Canada. The plant provides secondary treatment for a population of 1,291, typical for small communities in the region. As an operational lagoon system, it relies on natural biological processes to treat wastewater before discharge. The plant operates under Alberta's Environmental Protection and Enhancement Act, which governs wastewater discharges. For small agglomerations like this, secondary treatment is the standard, meeting provincial water quality objectives. The facility's daily discharge volume of 757 cubic meters reflects the scale of the community it serves. The treated effluent is released into local waterways that drain into the Peace River watershed, eventually reaching the Mackenzie River system and the Arctic Ocean. The Peace River supports diverse aquatic life and is an important ecological corridor in northern Canada. The plant's location inland, far from coastal areas, reduces direct marine impact.

The plant discharges into tributaries of the Peace River, which flows into the Slave River and then the Mackenzie River, ultimately reaching the Beaufort Sea in the Arctic Ocean. The Peace River watershed supports a variety of fish species, including walleye and northern pike, and provides habitat for migratory birds. The region's cold climate and seasonal flow variations influence the assimilative capacity of receiving waters.