City meeting hears long, costly fight to restore the Wensum and Yare
Councillors in Norwich were told this week that the city’s two principal waterways are “possibly in their worst ever condition” and that restoring them could take decades and substantial public and private investment. A special scrutiny meeting at Blackfriars’ Hall brought together councillors, campaigners, conservation groups and members of the public to hear stark assessments of the state of the Wensum and the Yare.
The warnings follow a summer of distress for the rivers. In July, after weeks of drought, a heavy downpour flushed pollution from drains into already warm, low-flow water and led to mass fish deaths in the heart of the city. The incidents highlighted long-standing problems: combined sewer overflows, toxic road runoff and near-record low flows in the rivers.
Historic infrastructure and repeated sewage discharges
Speakers at the meeting emphasised that much of Norwich’s sewer network is Victorian and that combined sewers can overflow into rivers during heavy rain to prevent sewage backing up into homes and streets. Figures presented to councillors showed repeated discharges from a single overflow point at Fye Bridge:
| Year | Number of discharges | Total days discharged |
|---|---|---|
| 2024 | 79 | nearly 26 |
| 2025 | 70 | almost 27 |
Those figures underline the frequency with which raw or partially treated wastewater has entered the Wensum, a river of conservation significance. The Wensum is one of only about 220 chalk streams worldwide, making its deterioration particularly concerning to ecologists and communities who value the river for biodiversity and amenity.
Costs, timescales and contamination concerns
Experts warned that fixing the two rivers will not be quick or cheap. Dr Jonah Tosney, head of rivers and catchments at Norfolk Rivers Trust, told the meeting:
“To fix those two rivers is going to cost tens of millions if not hundreds of millions of pounds, and it’s going to take 20 or 30 years. ”
Green councillor Gary Champion highlighted the age of the sewer system, saying the Norwich network is “sorely outdated” and requires significant investment. Delegates also heard that the Yare’s riverbed contains mercury discharged by industry since 1964, adding a legacy contamination issue to the list of pressures on the rivers.
Anglian Water has warned that flows in the Wensum were among the lowest for the time of year since records began in the 1960s, a factor that exacerbates pollution impacts because low water volume reduces dilution and can mean warmer temperatures that stress aquatic life.
What this means for Norwich residents
For people in Norwich the problems have several implications. There are environmental and public-health concerns where sewage overflows reach urban stretches of river. Recreational uses such as angling, boating and riverside leisure are affected when fish die-offs or visible pollution occur. There is also a financial dimension: the scale of repair and infrastructure upgrading implied by expert testimony suggests prolonged disruption and hard choices over who pays and how work is prioritised.
- Repeated sewage discharges have been recorded at Fye Bridge in 2024 and 2025.
- Experts estimate restoration could take two to three decades and cost from tens to hundreds of millions of pounds.
- Legacy contamination and low flows are compounding the rivers’ decline.
The scrutiny meeting made clear that any response will require co-ordinated action across agencies, long-term funding and transparency about priorities and timetables. Campaigners and conservation groups will press for urgent measures to reduce pollution events and for a staged plan that addresses immediate public-health risks while mapping out longer-term infrastructure improvement.
Norwich faces a difficult task: balancing the immediate need to prevent further ecological harm with the practical realities of upgrading ageing Victorian infrastructure and tackling legacy pollution that has accumulated over decades.
