October 7, 2025
NELSON – City responds to force main leak with environmental safeguards and long-term planning
The City of Nelson is conducting repairs on the Grohman Narrows wastewater force main, after being alerted to two leaks. One of the leaks has been successfully repaired. Evidence of a second leak was identified on October 6; a Remotely Operated Vehicle (ROV) is being deployed to locate the leak, and dive crews will be dispatched to complete the repair as soon as possible. The City of Nelson’s proactive safeguards and contingency planning ensure minimal environmental impact while long-term infrastructure upgrades continue.
Water sampling of the Kootenay River is being completed every second day. The results are all within regular parameters and do not pose a risk to residents.
The City has reported the incident to provincial authorities in full compliance with environmental regulations and is maintaining communications with the province.
The force main is continuously monitored by a 24-hour automated system that triggers alarms if flows change unexpectedly. In addition, professional divers conduct bi-annual inspections of both the pipe and surrounding riverbed. These inspections not only assess the condition of the infrastructure but also ensure the surrounding aquatic environment remains protected.
While small leaks are consistent with natural wear over time, the City’s proactive planning and rapid response protocols ensure s that leaks are addressed swiftly and responsibly. Environmental protections are in place and long-term infrastructure renewal is already underway. This incident highlights why replacing aging infrastructure is a priority and reflects the steps Council and staff are already taking to ensure safety and sustainability.
Aging Infrastructure, Modern Solutions
The Grohman Narrows Treatment Plant, completed in 1971, has reliably served Nelson for over 50 years. The submarine force main—constructed using tar-coated steel and anchored beneath the riverbed—was considered state-of-the-art at the time. Only one major repair was needed prior to 2021. However, the corrosive nature of wastewater has led to six small leaks since fall 2021, all of which were repaired promptly and reported to the Province.
This history underscores the importance of ongoing investment in resilient infrastructure, especially as climate pressures and aging systems converge.
Building for the Future
Recognizing the age and vulnerability of this critical infrastructure, the City launched a comprehensive replacement plan in 2023. Nelson has applied to the Province of BC’s 2025 Strategic Priorities Fund for $7 million toward the estimated $11.6 million cost of replacing the force main. Project designs are expected to be completed in 2026 with a goal of construction in 2027.
This priority investment is part of a broader, long-term strategy that includes:
- Upgrades to the Grohman Narrows Treatment Facility
- Enhanced stormwater management
- Reinvestment in critical wastewater infrastructure
These projects are designed to protect the Kootenay River, strengthen environmental resilience, and ensure the community’s infrastructure remains sustainable for decades to come. The City remains committed to fiscally responsible solutions that safeguard public health, support future growth, and uphold Nelson’s values of environmental stewardship and community well-being.
Resident input needed
The City is engaging residents in planning for the future of our liquid waste system. Through the Let’s Talk Nelson platform, residents can explore potential sites for new infrastructure, view results from the 2024 community survey, and share feedback.
The survey is open until October 31, 2025 at https://letstalk.nelson.ca/liquid-waste-management-plan. Paper copies are available at the Nelson Public Library and City Hall.
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