From source to sink
Where Cornwall water comes from
A plain-language tour of the lakes, rivers, or wells that feed Cornwall, the plants that clean the water, and how it reaches kitchen taps. Lab grades for hardness, lead, and pH live on the water quality page.
On the map
Where Cornwall water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityCornwall
Municipal service area
- Source waterSaint Lawrence River
Source water
- Treatment plantCornwall Water Purification Plant
Approximate pin near Cornwall (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Deep dive for households
Cornwall drinking water starts as surface water (rivers, lakes, or reservoirs). The named source on the utility record is Saint Lawrence River. That is the water that eventually reaches kitchen taps after treatment, not a separate bottled brand.
Water is cleaned at Cornwall Water Purification Plant before it enters city pipes. Class 3 plant at 861 Second Street West. Intake and zebra-mussel control facilities at the base of R.H. Saunders Dam. Chemically assisted coagulation/flocculation, filtration, UV, and chlorine disinfection.
After treatment, water moves through pumps, storage, and underground mains to reach streets and buildings. Includes Boundary Road Reservoir and Tollgate Road elevated storage feeding the Class 3 city distribution system.
One detail that makes Cornwall water feel local: Cornwall’s intake sits at a major St. Lawrence power dam, so intake protection zones and zebra-mussel control are built into plant operations. Lab grades for hardness, lead, and pH sit on the city water quality page; this overview is about the route the water travels.
Where it starts
Surface water
Rivers, lakes, or reservoirs, not underground wells as the main draw.
Research confidence: high
Named source waters
- Saint Lawrence River
Treatment plants
These are the buildings that filter and disinfect water before it enters city pipes.
Cornwall Water Purification Plant
Class 3 plant at 861 Second Street West. Intake and zebra-mussel control facilities at the base of R.H. Saunders Dam. Chemically assisted coagulation/flocculation, filtration, UV, and chlorine disinfection.
How it reaches your street
Includes Boundary Road Reservoir and Tollgate Road elevated storage feeding the Class 3 city distribution system.