Chalk Streams: Sewage Discharge

Debate between Emma Hardy and Sarah Green

Tuesday 8th October 2024 Westminster Hall

[Emma Hardy]

I had just taken an intervention from the hon. Member for Chichester (Jess Brown-Fuller), who talked about the excessive removal of water and the situation that she finds herself in with the water company. I agree that we need to look for a long-term solution.

When we abstract too much water, that increases the concentration of pollutants and the water temperature, and decreases oxygen levels, leading to increased silt and loss of habitat. As the hon. Member for Henley and Thame (Freddie van Mierlo) mentioned, the physical habitat of our chalk streams has also been altered. They have been modified by people over recent decades, limiting the naturally varied habitats that plants and animals rely on and exacerbating the negative impacts of abstraction and pollution. Taken together, along with the sewage incidents, these pressures are placing our chalk streams under increasing strain and environmental stress.

In the constituency of the hon. Member for Harpenden and Berkhamsted, where chalk streams including the River Lea and River Ver flow, these pressures are no different. That is why this Government are continuing to ensure the conservation of chalk streams. Under the Government’s water industry national environment programme, improvements have been agreed for three waste water treatment works in the Harpenden and Berkhamsted constituency. They include stricter phosphorus limits for the discharge of fully treated sewage effluent and improved waste water flow monitoring to ensure that the required volumes of sewage receive full treatment before any storm overflow can occur. The capacity of the Berkhamsted waste water treatment works to fully treat sewage has also been increased from 247 litres to 316 litres per second, providing for a higher and larger quality of treated effluent.

The Environment Agency is investigating the cause of a prolonged storm discharge from the Markyate sewage treatment works into the River Ver. Unfortunately, as it is a live investigation, I cannot go into more detail now, but I greatly encourage the hon. Member for Harpenden and Berkhamsted to speak to the director of the Environment Agency about that and, of course, when the investigation is concluded, we can have a more detailed conversation about the issue and about what enforcement action can be taken.

I should also note that the Environment Agency has been working with Affinity Water and local partners to revitalise chalk rivers by leaving more water in the environment, addressing the issue of over-abstraction of our chalk rivers, and improving the physical habitat and water flow. Water abstractions across the catchment have been reduced by 33.3 megalitres per day, with a further reduction of 23.5 megalitres per day to be delivered by spring 2025. This is ongoing work in progress to address over-abstraction from chalk streams, which we rightly recognise is a concern.

[Sarah Green]

The Minister is making the point, rightly, about individual projects that water companies such as Affinity Water have invested in. What is missing is a strategy across the country for all chalk streams. That is why I am calling on her, in her position as a Minister, to give chalk streams the designation and special status they need so that this is not treated in a piecemeal way.

[Emma Hardy]

I thank the hon. Lady for her intervention. I was addressing the specific chalk stream raised by the hon. Member for Harpenden and Berkhamsted. However, I completely agree with the wider point about having an overall strategy to deal with the problems faced by water.

There is also the Spring Clean for Colne project, covering the River Ver and River Bulbourne. This partnership project is identifying, logging and mapping the outfalls, channels and ditches that could be a source of pollution in the Colne catchment. By first identifying the sources of pollution, we can then work on providing the solutions.

On a broader scale, which I think is the question that the hon. Member for Chesham and Amersham (Sarah Green) wanted me to consider, the Government are continuing to take action to ensure the recovery and preservation of chalk streams. Earlier this year, the Department for Environment, Food and Rural Affairs launched its species survival fund, which aims to bolster conservation efforts across the country. Through this fund, 20 conservation projects will collectively receive a share of £25 million, with the goal of restoring 3,300 hectares of vital habitat for wildlife.

Notably, two of these projects will specifically benefit our chalk streams. These are the partnerships for nature in the north Wessex downs area of outstanding national beauty, which will restore over three kilometres of chalk stream habitat, and the riparian habitat improvements in Hertfordshire’s chalk rivers from the Herts and Middlesex Wildlife Trust, which will restore chalk river habitats across 11.15 kilometres of the River Lea catchment. We are also contributing £1 million to chalk river initiatives in 2024-25, collaborating with partners on 30 projects aimed at safeguarding these rare and irreplaceable habitats. That effort is crucial to our commitment to protect these habitats as part of the water resources chalk partnership fund.

Taken together, those points demonstrate that this Government are continuing to view chalk stream recovery as a key, important issue. Although money has previously been invested in their conservation, I am aware—very aware—that more work needs to be done and that recovery is not a quick fix.