Our Spring 2025 Consultation

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Our Spring 2025 Consultation will run from 5 March to 4 April 2025. We are seeking your views on updated environmental water quality information and proposed Project design refinements.

Knowing what matters to you, matters to us. Your feedback is important to us and will further help inform the preparation of our Development Consent Order application. Our consultation is open from 5 March 2025 and closes on 4 April 2025. You can respond using the channels below. Please note that feedback received late, after 11.59pm on 4 April 2025, may not be considered.

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FREEPOST HAMPSHIRE WTWRP
CONSULTATION

Overview

At the Summer 2024 Consultation, we explained that extensive water quality modelling was being undertaken and that the outputs of the modelling and assessment of effects would be fully reported in the Environmental Statement with our Development Consent Order application.

This modelling has since progressed, so we are taking the opportunity to share this updated information now, alongside a number of Project design refinements. Specifically, our Spring 2025 Consultation focuses on:

  • Predicted water quality impacts on the Havant Thicket Reservoir, connected downstream water bodies (including Riders Lane Stream, Hermitage Stream, and Langstone Harbour), and the Solent. Scroll down for more information and to view our Environmental Water Quality Report.
  • Proposed refinements to the design of the Project that take into account feedback from the Summer 2024 Consultation and on-going project development and stakeholder engagement, details of which can be found below and in the Consultation Information document.

Environmental water quality

Feedback to our Summer 2024 Consultation highlighted concerns about the impact of the Project on water quality in the environment, especially within Havant Thicket Reservoir and the Solent. The concerns mostly related to the water recycling process and the quality of the purified recycled water.

In response to this, we are sharing as part of this consultation our Environmental Water Quality Report which provides updated information on our latest water quality modelling and assessment work. We want to let you know what this work is telling us and what we are doing about it.

In summary, the report predicts that there would be some limited changes to water quality in Riders Lane Stream and Hermitage Stream (both downstream from Havant Thicket Reservoir) but that these changes are unlikely to result in any adverse impacts on biodiversity. Changes in water quality in Langstone Harbour (fed by Riders Lane and Hermitage Streams) would be very small and again are not expected to have any impact on biodiversity. The report also confirms that reject water from the water recycling process, which will be released into the Solent, is unlikely to affect water quality or the biodiversity of the Solent.

Within Havant Thicket Reservoir, the report predicts that the level of phosphorous in the purified recycled water could encourage algal growth, which could potentially limit biodiversity in the reservoir. Our Development Consent Order application will therefore include measures for reducing phosphorous as part of the water recycling treatment process. The Environment Agency, our environmental regulator, will stipulate an Environmental Permit that sets the water quality requirements of the purified recycled water that can go into the reservoir including for phosphorous. We are working with the Environment Agency to determine how these measures are best introduced. Details of this, together with any further modelling and assessment work, will be set out in full in our Development Consent Order application later this year.

Environmental Water Quality Report

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Design refinements

We are proposing 25 Project design refinements. Many of the changes we are proposing to make are localised and the Project as a whole has not fundamentally changed.

Each design refinement has an information sheet which details the proposed change, explains why we're proposing the change, and how the change may affect the environment and the local community. We have produced plans showing the Summer 2024 Consultation design alongside the proposed design refinement.

Below is our design refinements overview map. Each number labels the location of an individual design refinement, numbering 1 to 25. The information sheets provide further detail on each of these design refinements. They should be read alongside the Introductory Information sheet which provides some background information about the design refinements.

Design refinements introductory information

FAQS

You can find all the relevant Project FAQs here. The following section addresses new questions for the Spring 2025 Consultation.

The four-week consultation runs from 5 March 2025 to 4 April 2025.

As part of our Spring 2025 Consultation, we want to know what stakeholders think about our updated water quality information and proposed project design refinements. More specifically:

  • Predicted water quality impacts on Havant Thicket Reservoir, connected downstream water bodies (including Riders Lane Stream, Hermitage Stream, and Langstone Harbour), and the Solent
  • Proposed design refinements to the Project, details of which can be found on our website and in the Consultation Information document.

As this consultation is supplementary to our Summer 2024 Consultation, we will not be holding in-person events this time around. We think this is proportionate to the scale and nature of what we are consulting on.

For this consultation, we are taking a digital first method. All the consultation documents are available on our website. If you require hard copies of consultation documents, these can be printed from the website or you can contact us, and we can send these to you free of charge. If you have any questions on the consultation and the information provided, please get in contact.

You can find out more information by visiting our dedicated Project website at www.HampshireWTWRP.co.uk.

Here you can view all our consultation documents from both the Summer 2024 Consultation and the Spring 2025 Consultation. At Summer 2024 Consultation, we used an interactive map to show how the Project might affect you and your area. For this Spring 2025 Consultation, we have created a new map, which also allows you to view our proposed Project design refinements. General information about the Project and the Summer 2024 Consultation can be found in the Summer 2024 Consultation Brochure.

Information about the Spring 2025 Consultation has been collated in our Consultation Information document, which includes all of our Project specific design refinements and a summary of our updated water quality information. This can be found in the document library on our website. However, more detailed findings on our environmental water quality information are provided in our Environmental Water Quality report, which can also be found on our website.

We want to hear your views about our updated water quality information and our proposed design refinements. The easiest way to respond is to complete our online feedback form which can be found at www.HampshireWTWRP.co.uk and paper copies are available upon request. You can also email FeedbackHWTWRP@southernwater.co.uk to submit formal feedback.

You can also write or send paper copies of the feedback form to FREEPOST HAMPSHIRE WTWRP CONSULTATION. You don't need a stamp, just ensure you copy the freepost address correctly. Please use capital letters as above and make your handwriting as clear as possible.

For general questions, please contact HampshireWTWRP@southernwater.co.uk. You can also call our freephone number on 0800 254 5138.

After the consultation closes, we will gather and analyse the feedback received. We will carefully consider all issues raised when finalising the proposed application. As part of the Development Consent Order application we will submit a Consultation Report, detailing how we have engaged and consulted on the Project. This will include a summary of feedback from both the Summer 2024 Consultation and Spring 2025 Consultation and how this has been considered in the development of the Project.

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