Dozens of Boston swimmers turned the Charles into their own backyard pool on Saturday, climbing up Fiedler Dock and cannonballing into the river during City Splash, the Charles River Conservancy’s annual public swim. The free, state sanctioned event drew a full crowd and an expanded vendor village, a rare, sunlit celebration of how far the river has come since the days when getting in the water was strictly off limits.
According to the Charles River Conservancy, this year’s City Splash ran in timed, preregistered 25 minute swim slots at Fiedler Field on the Esplanade and featured food trucks, crafts, and on land activities from noon through the afternoon. The Conservancy describes the swim as a cornerstone of its push to make the Charles a reliably swimmable urban river and notes it partners with the Department of Conservation and Recreation and community boating organizations to pull it off.
Axios reporter Mike Deehan reported that the water felt warm and clean enough for a genuinely pleasant dunk, and that slots for the swim typically sell out within hours each year. This year’s crowd seemed to share that optimism, even as many treated the afternoon as a carefully permitted experiment in bringing swimming back to a river that is still recovering its reputation.
Organizers were especially cautious after last summer, when heavy rains pushed E. coli counts above safety thresholds and forced a last minute cancellation that left roughly 400 registrants high and dry. That episode underscored how quickly weather can swing the river’s health and helped shape tighter safety protocols, as reported by CBS Boston.
Sewage Showdown Casts Shadow On The Party
The celebration unfolded against a tense regulatory backdrop. The Massachusetts Water Resources Authority has been working through long term planning for combined sewer overflows and related controls, noting that CSOs and stormwater remain important contaminant sources in the Charles River basin. MWRA lays out the technical case and public health risks in joint press materials with Cambridge and other partners, as detailed by MWRA.
The Charles River Watershed Association has sharply criticized the direction of that planning. The group called MWRA’s recent board vote a step backward, arguing that the plan the authority approved in February would allow sewage discharges to continue during storm events and still needs review by state and federal agencies. “We’re deeply disappointed in today’s vote,” CRWA Executive Director Emily Norton said in a press release, urging people to weigh in during the public review period, according to the Charles River Watershed Association.
When The Charles Is Safe To Swim
Public health advice remains simple, if not always convenient. Officials say to avoid contact with the Charles during heavy rain and for about 48 hours afterward, since runoff and CSOs can cause sharp spikes in bacterial risk. MWRA also points residents to tools such as CSO activation notifications and routine monitoring so people can check conditions before heading to the dock, resources outlined on MWRA.
For now, the Conservancy and its partners frame City Splash as both a neighborhood block party and a policy nudge for more frequent public swimming. The event page highlights a “vision for a swimmable river,” and attendees told The Boston Globe they would welcome more chances to cool off in the Charles on hot summer days. Details on that vision and the annual swim are laid out by the Charles River Conservancy.
Regulatory next steps will determine whether City Splash remains a once a year novelty or becomes part of a regular Boston summer routine. The Charles River Watershed Association notes that MWRA’s plan still requires review by the Massachusetts Department of Environmental Protection and the U.S. Environmental Protection Agency, and that a public comment period and hearings are expected before a final decision in early 2027, according to the Charles River Watershed Association.
Policy fights aside, Saturday’s swims delivered something very simple: a cool dip on a hot day and a vivid reminder of how much the Charles has improved, as well as how fragile that progress remains, as Axios noted. For many swimmers climbing back onto Fiedler Dock, that contrast was exactly the point and a reason advocates are pushing for more regular access to the river.
