January 28, 2026
The River Wensum is the largest chalk-fed river in Norfolk, flowing from the village of Whissonsett through market towns such as Fakenham and dedicated nature havens like Pensthorpe. As it reaches Norwich, it flows past Carrow Road football ground before merging with the River Yare at Whitlingham.
It’s no exaggeration to say this river flows through nearly everyone’s lives in Norfolk. Without it, our landscape would decline, Norwich’s charm would fade, and a diverse range of flora and fauna would disappear.
However, the Wensum faces significant challenges. Pollution from agricultural and rural sources, as well as urban run-off and sewage, poses a critical risk to its health. These pollution events are often unintentional and go unnoticed, causing harm beneath a seemingly calm surface and abundant vegetation.
This is where citizen scientists come in.
Citizen scientists, everyday people doing ecological and scientific surveys, have a long history of collaborating with professionals to monitor vital habitats and species. Their dedication helps detect environmental issues and encourages positive, evidence-based action for nature.
At Norfolk Rivers Trust, we run two citizen science programmes, including the Catchment Systems Thinking Cooperative (CaSTCo) project, which focuses on protecting the River Wensum.
How it works
Volunteers are trained to collect and test water samples using standardised tools. In as little as 30 minutes, you can measure crucial health indicators, including dissolved oxygen, phosphate, ammonia, nitrate, and pH.
Why it matters
This research not only provides high-quality data to drive restorative action along the Wensum but also fosters deeper connections between people and their rivers. By visiting the same riverside locations weekly, you can really get to know your river, recognising how it lives and breathes across every season.
So, if you can donate 30 minutes each week to help us protect the River Wensum, you can find out more and register on our dedicated citizen science water quality monitoring page: From data to action: Driving meaningful impact
The Wensum Catchment Partnership are seeking a new voluntary Chair to work with partner organisations to help shape a shared strategic vision that leads to meaningful improvements to the river and its catchment.
We're celebrating the second year of supporting schools, charities, and community groups in experiencing Norfolk’s beautiful countryside with the Aviva Access to Nature Fund.
Did you know that old septic tanks can pollute nearby waterways? We've partnered with Our Rivers and Binder to upgrade outdated septic tanks in key catchments across Norfolk.
Proactively protecting the village of Gissing, in south Norfolk, from flooding.
Across the south of England, you can find wonderful sources of crystal-clear water better known as chalk streams.
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