People are naturally very concerned when, during a drought and a hosepipe ban, they see pumps operating to abstract water from the River Cam or its chalk stream tributaries. We have had a number of queries about this over this summer, so this blog aims to provide some answers.
Current legislation states that an individual or a business may “abstract” (i.e. remove) up to 20 cubic metres of water a day from a river, stream, lake, or underground source – equivalent to 20,000 litres or 4400 gallons/day, whether that’s from a single place or several different places on the same river or stream. Above that amount, a licence from the Environment Agency is required.
As Rob Bakewell, of the Environment Agency, has explained to us:
“Licence specific details will include how much water can be taken, when it can be taken, where it can be taken, and for what purpose. We monitor river water levels and flows via telemetry from sites around East Anglia, including along the River Cam. My team monitor these Monday to Friday and inform licence holders when they can and cannot take water, based on conditions designed to protect river wildlife and habitats. Water levels in the River Cam and its tributaries are currently low due to a dry spring, and some licences have seen temporary reductions in abstraction, but abstraction is currently still permitted. This can change depending on how river levels and flows are affected by weather conditions. Environment Agency teams are currently reviewing and renewing abstraction licences in the area. This is a rolling programme where we review abstraction in our catchments. This includes checking that water use is environmentally sustainable.”
Legislation requires that abstraction licence holders from all sectors must submit annual returns detailing how much water they have taken. The Environment Agency encourages licence holders to do this using their online Water Resources Licensing Service. Returns data are checked to ensure water has been taken according to the licence conditions. Although there have been cases of farms breaching their permits, Rob Bakewell says that in our region nearly all licence holders take water legally and, if any discrepancy is noted, the EA regulatory teams investigate and take appropriate action.
The Environment Agency’s 2020 Cam and Ely Ouse Abstraction Licensing Strategy sets out how abstraction is managed.
If you suspect someone is taking water when they shouldn’t, or to report an environmental problem, please call the Environment Agency’s 24/7 incident hotline on 0800 80 70 60.
Here are two examples of abstraction, that we’ve been asked about
Trumpington Farm Company
Cam Valley Forum has received several queries in relation to a pump that has been operated by Trumpington Farm Company, near a popular spot on Grantchester Meadows, below the Red Lion Pub, Grantchester.

Rob Bakewell of the Environment Agency has explained to us:
“Trumpington Farm Company holds four abstraction licences that allow them to take water from parts of the River Cam, Granta, and Rhee. At this time of year, the company uses the water to irrigate crops. Their licences allow them to move pumps along certain stretches of the rivers, rather than taking water from one fixed location, so pumps may be placed wherever the water is needed. This can mean that other river users may see and hear abstraction pumps operating, as part of normal farming activity.”
We have also discussed this with the Dave Knott, the farm manager for Trumpington Farm Company. He explained that they have a large network of storage reservoirs, pumps and pipes, and that they also use the rivers to transfer water. Part of this network is shown on the map below.

Their reservoirs near Cantelupe Farm are refilled during wet weather and can hold 32 million gallons of water to use when the weather is dry. To our surprise they told us that they are currently (in August 2026) pumping this water INTO the river, as a way to transfer it to where it’s needed. They then pump slightly less back out again, further downstream where they need it to irrigate crops: in this case, near Grantchester (opposite Red Lion meadow).
The water that people have noticed being pumped out of the Cam at this spot is being pumped through a network of pipes up to a field nearer to Trumpington Road, where it is being used to irrigate sugar beet.

We were reassured to hear that they aim to put 110 litres into the river, for every 100 litres they take out of the river. It seems that Trumpington Farm Company is behaving according to the regulations, and we are pleased that they realise the importance of maintaining and even trying to increase the flow of the Cam during the drought.
They tell us that they try to only operate the pump at night, because that’s a more efficient way to use the water, but sometimes they’ve also needed to operate it during the day.
This statement may seem puzzling to those who walk along the river, who have observed the pump in operation during much of the daytime throughout June and July. However, the heat really has been exceptional, and is very worrying; Dave Knott, the farm manager, tells us that the sugar beet is really suffering. He says “It looks like it’s been ironed”. He is also worried about next year’s harvests, as they should have started planting two weeks ago, but the hard and dry ground has prevented this.
Cherry Hinton and the Blacklands Allotments
This year, as in all previous dry and drought years, there have been numerous complaints and queries about the pump that is seen operating frequently, including at night, on the bridge across Cherry Hinton Brook, at the entrance to Blacklands Allotments (at the Daws Lane end of Snakey Path, near Cherry Hinton Hall).

The Blacklands Allotments, along with the adjacent banks of Cherry Hinton Brook, belong to Peterhouse College. Local residents can rent a plot. As a ‘riparian’ owner, Peterhouse (through its allotment holders) is allowed to abstract 20,000 litres a day from the brook, without a licence. However, the allotment holders together must not exceed the total amount of 20,000 litres a day to which Peterhouse is entitled.
For many years (reportedly since the mid-1960s), certain plot holders have used a pump to abstract water into tanks to use by themselves and for other plot holders. In both 2012 and 2014, the Environment Agency was contacted about this practice and in both cases, following inspection, the plot holders were told there was no objection. Unlike many council-owned allotments, there are no water pumps or troughs providing water for plot holders to use, and relatively few plot holders appear to have their own rainwater harvesting systems. Nevertheless, the pump does not send a good message about the vulnerability of Cherry Hinton Brook during the drought; in previous years, sections have indeed dried out and the level is dropping quite rapidly at the moment.

Allotment holders are struggling with this long dry period. Many have already exhausted their stored water; others have not had the means or resources to install water storage.
Friends of Cherry Hinton and Coldham’s Brooks (FCHCB) are working with local allotment holders, with the local Council and all involved to increase publicity about the importance of the City’s chalk streams and to encourage allotment holders to minimise their use of brook water wherever possible. We are also looking at ways of helping plot holders to install water harvesting systems so that in the future they will have better access to stored water, without needing to use the brook.


































