Swimming Urban Rivers

Host Thomas Hynes speaks with Laura Reinsborough of Ottawa Riverkeeper about the Ottawa River’s swimmability and watershed protection. Reinsborough outlines her background in environmental studies, founding an urban fruit tree nonprofit in Toronto, and leading Food for All New Brunswick. She describes the Ottawa River as a 1,200+ km river with a vast drainage basin, the largest tributary to the St. Lawrence within the Great Lakes–St. Lawrence freshwater system, and notes it runs through unceded Anishnabe Algonquin territory across Ontario and Quebec. Ottawa Riverkeeper began in 2001 in response to untreated sewage from combined sewer overflows across a fragmented watershed of over 300 municipalities. She reports that the City of Ottawa’s overflows have been reduced by over 90% through transparency, monitoring (including real-time public maps and email notifications), and major infrastructure, including a sewage storage tunnel completed in 2021. 

Despite improved water quality, public perception lags; a 2020 survey found most believed the river unsafe. Reinsborough says people do swim (herself included), and urban beaches test safe about 85% of the time, with results aggregated on Swim Guide and advice to wait 24–48 hours after heavy rain. She discusses the Swimmable Cities Alliance and swimming as human “rewilding.” Additional priorities include road salt, 85+ fish species, American eel decline due to 50+ dams, PFAS and microplastics, and nuclear waste concerns. She also describes River School (launched 2023 at River House), reaching about 4,000 students with hands-on watershed, biodiversity, and water-quality education, including a birchbark canoe module.