Edmundston draws municipal drinking water from Iroquois / Blanchette wellfield (near Rivière Iroquois / chemin Olivier-Boucher) and Additional designated watersheds serving Edmundston (Blanchette Brook, Iroquois River, Trois-Milles Brook, and related Madawaska/Verret tributaries), treated at Edmundston municipal wells / chlorination system.
Ask where Edmundston drinking water begins and the answer is Additional designated watersheds serving Edmundston (Blanchette Brook, Iroquois River, Trois-Milles Brook, and related Madawaska/Verret tributaries), then Edmundston municipal wells / chlorination system. That supply chain is what the water atlas puts beside hardness and lead.
City Public Works: groundwater wells of high quality; treatment limited to chlorine injection for bacteria control plus zinc phosphate for corrosion control. Daily monitoring of reservoirs, wells, and water quality per NB Environment standards.
See the Edmundston water page for the grade, source notes, and municipal report links.