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The River Avon SAC (special area of conservation) runs through several different administrative areas. The catchment area for this habitat site overlaps part of Dorset Council area. Wiltshire Council act as the lead authority on planning issues relating to nutrient pollution of the River Avon. We have been working closely with Wiltshire Council on these issues to ensure that there is effective joint working across our boundaries.
On 25 January 2024, the Secretary of State designated the River Avon as a nutrient sensitive catchment for phosphorus.
Wiltshire Council has been awarded £9.8m of grant funding to aid the delivery of nutrient mitigation within the River Avon catchment. This grant enables mitigation projects to be identified and delivered, and for mitigation credits to be sold. Third-party mitigation providers are also beginning to deliver measures in the catchment of the River Avon.
Within this catchment developers will take responsibility for securing nutrient mitigation for their development proposal. Mitigation can be secured:
In all instances, the mitigation will need to be secured in perpetuity through the necessary legal agreements or planning condition.
Within the River Avon catchment, there is a need for qualifying developments to demonstrate neutrality for phosphorus. Qualifying development includes:
Development that increases overnight stays in the catchment may comprise permanent residential development, gypsy and traveller development, care homes, nursing homes, tourist accommodation including both permanent and temporary campsites and hotels.
The boundary of the River Avon catchment is defined within the catchment map. Within this area, it is presumed that wastewater and surface water arising from qualifying development is likely to increase phosphorous levels within the River Avon. Where an applicant considers that either wastewater or surface water from their development will not discharge into River Avon they must submit details with their planning application.
The latest River Avon nutrient budget calculator (May 2024) should be used to assess the development’s nutrient budget. Applicants will need to demonstrate that appropriate mitigation measures have been secured to offset the phosphorous arising from qualifying development.
A nutrient neutrality statement must be submitted with any planning application for qualifying development in the River Avon catchment which is also in Dorset Council area. There are further details on the statement in our local list requirements, but it should include:
We have produced a guidance note to assist applicants where they propose to upgrade an existing septic tank or package treatment plant to provide mitigation measures, or where they propose to connect a development to a new package treatment plant. Where relevant, applicants may wish to refer to this note when preparing their planning application.