/-74.7009373,45.0178311,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
St. Lawrence River: Near Montreal Rd. Culvert outflow, outside of pit
Cornwall, Ontario, Canada
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: June 19, 2025
Locations
Locations are places where people have tested before. Click on any location report to view water health trends at that spot over time. What's this?
8,226 locations
+38 new sample locations added in the past 30 days
River
Last observed: August 14, 2025 Monitored since: June 19, 2025
/-74.7007442,45.0178305,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
St. Lawrence River: Montreal Rd. Culvert outflow
Cornwall, Ontario, Canada
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: June 19, 2025
/-74.6994781,45.0164665,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
St. Lawrence River: St. Lawrence River Dock River Intitute
Cornwall, Ontario, Canada
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: June 19, 2025
/-74.7014,45.016,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
St Lawrence River: Cornwall
Ontario, Canada
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: September 13, 2019
/-122.7271322,49.2814134,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
DeBoville Slough : Devon
Coquitlam, British Columbia, Canada
Waterbody Type:Wetland
Last observed: August 14, 2025 Monitored since: November 9, 2022
/-83.8805588,46.3158914,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Lake Huron: Archibald Dock
Ontario, Canada
Waterbody Type:Lake
Last observed: August 14, 2025 Monitored since: May 30, 2022
/-0.2814116,51.607569,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Edgware Brook: Chandos Park (Downstream)
London, Harrow, United Kingdom
Waterbody Type:Stream
Last observed: August 14, 2025 Monitored since: February 9, 2024
/-0.2848075,51.606746,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Edgware Brook: Chandos Park (Upstream)
London, Harrow, United Kingdom
Waterbody Type:Stream
Last observed: August 14, 2025 Monitored since: February 9, 2024
/-0.2607322,51.3575269,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Hogsmill: Downstream Stepping Stones
Epsom, Surrey, United Kingdom
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: June 22, 2024
/-0.2578354,51.3563039,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Hogsmill: Green Lanes A (downstream of old green lanes stream)
Epsom, Surrey, United Kingdom
Waterbody Type:River
Last observed: August 14, 2025 Monitored since: November 22, 2024
/-77.3378277,43.9511194,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
West Lake: Public Boat Launch at Wellington Harbour on West Lake
Wellington, Ontario, Canada
Waterbody Type:Bay
Last observed: August 13, 2025 Monitored since: April 10, 2019
/-76.3938056,44.6788184,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Upper Rideau Lake: Westport Harbour
Westport, Ontario, Canada
Waterbody Type:Lake
Last observed: August 12, 2025 Monitored since: August 12, 2025
/-76.3937627,44.6788947,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Big Rideau Lake: Westport Harbour
Westport, Ontario, Canada
Waterbody Type:Unknown
Last observed: August 12, 2025
/-0.1832101,51.635848,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Dollis Brook : Brook Farm Open Space
London, Barnet, United Kingdom
Waterbody Type:River
Last observed: August 12, 2025 Monitored since: November 7, 2024
/-73.2760835,45.4495745,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Rivière Richelieu: Fort Chambly
Chambly, Quebec, Canada
Waterbody Type:River
Last observed: August 12, 2025 Monitored since: August 3, 2022
/0.0276999,51.4265515,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Pond: Chinbrook wetlands outlet pond
London, Bromley, United Kingdom
Waterbody Type:Wetland
Last observed: August 12, 2025 Monitored since: October 27, 2024
/0.0267864,51.4271598,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Pond: Chinbrook wetlands inlet pond
London, Bromley, United Kingdom
Waterbody Type:Wetland
Last observed: August 12, 2025 Monitored since: October 27, 2024
/-0.2200931,51.5761087,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
River Brent: Brent Cross
London, Barnet, United Kingdom
Waterbody Type:River
Last observed: August 12, 2025 Monitored since: February 18, 2025
/-0.1822764,51.626908,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Dollis Brook : Whetstone Stray
London, Barnet, United Kingdom
Waterbody Type:River
Last observed: August 12, 2025 Monitored since: November 7, 2024
/-83.2890916,46.3149095,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
Red Rock Lake: Red Rock Lake
Iron Bridge, Ontario, Canada
Waterbody Type:Lake
Last observed: August 11, 2025 Monitored since: June 10, 2025
/0.0847473,51.4674396,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImY4Mzc4MTZkZDZkN2Y4YzFhMjA2MzQ3NDAyZjM0MjI1In0.jA6aLxZWzUm8bSBbumka4Q)
East Wickham: Woodlands farm, Oxleas and Bellegrove road stream
London, Bexley, United Kingdom
Waterbody Type:River
Last observed: August 11, 2025 Monitored since: March 9, 2025