Wastewater from within the hamlet of Langdon is collected, conveyed, and treated at the East Rocky View Sewage Treatment facility located in Langdon. The facility also treats wastewater from the hamlets of Balzac and Conrich.

One third of future upgraded capacity of the facility shall be dedicated to future development within the hamlet of Langdon, which at full build-out of the facility, amounts to approximately 2,400 cubic metres of treatment capacity.

This equates to approximately 2,710 total dwelling units (including existing dwelling units) and a population of approximately 8,400 residents. It should be noted that the number of homes and residents calculated would be less if wastewater capacity is dedicated to non-residential development.

Capacity of the East Rocky View Sewage Treatment facility is dependent on the ultimate loading capacity of Weed Lake and the quality of treated effluent discharged to the lake.