This water course has two arms, one running down from near Princes Risborough (the Kingsey Cuttle brook) and the other from near Chinnor (the so-called Chinnor Brook). The former takes the outflow from the Princes Risborough sewage treatment works (STW), the latter from the STW at Henton (often called Chinnor STW) and another at Towersy. The two branches converge 300 metres upstream of the Cuttlebrook Koi Farm (near Towersey) before continuing on to join the Scotsgrove Brook between Thame and Haddenham. Much of the Kingsey Cuttlebrook is the boundary between Oxfordshire and Buckinghamshire.
In 2015, the Environment Agency classified the Chinnor Brook section as “moderate”: the Brook needs improvement to both the phosphate and invertebrate status which are both set at “moderate”. It is likely that the sewage treatment works is having significant impacts on phosphate levels, and this will then have an impact on the invertebrates that are able to survive. The Chinnor brook is targeted to reach “good” status by 2027.
The rest of the Kingsey Cuttle Brook was classified as “poor” in 2015. The water quality, as in many of the waterbodies within the Thame Catchment, is all classified as “high”, except for the phosphate levels, with poor phosphate concentrations having impact on both invertebrates and fish. By 2027 the brook is targeted to meet “moderate” status; this target of “moderate” is due to poor phosphate levels which are deemed as unfeasible to improve. We hope that over time as practises change in both sewage treatment and agriculture, that a better water quality will be achieved. See how you can make a difference in your home here.
You can find out more about the classification of rivers in our catchment by using the Environment Agency’s Catchment Data Explorer.
The river isn’t the only water that we are concerned with. There are multiple small waters including ponds, ditches and steams. All of which are highlighted on the map below.
We currently have no projects planned for this area, if you have any suggestions then we would love to hear from you.
Water quality has been monitored sporadically across the whole of this area, and we also have regular monthly samples being taken by one of our Trustees and volunteers, Nick Marriner. Alongside his water quality monitoring he also samples for riverflies once a month. You can take a look at his results here.
We would love to extend our volunteer monitoring in this area. You can find out more about our volunteer monitoring and how you could get involved in monitoring yourself here.
There are currently no groups that are working specifically on the Kingsey Cuttle Brook. If you would like to get involved by starting a local group in your area, then please get in touch.