As part of a strategic initiative, the Solent Mitigation Partnership is working to deliver upgrades to private septic tanks (domestic sewerage systems) across multiple authorities within the Solent area. These upgrades will convert existing septic tanks into more advanced package treatment plants (PTPs), significantly improving the removal of nutrients from wastewater before it enters sensitive water environments.
Once this scheme is operational, these upgrades will generate nutrient credits that developers can purchase to support housing and projects.
This Solent-wide upgrade programme offers a coordinated, cross-boundary solution to the region’s nutrient challenges. By delivering targeted improvements to domestic sewage infrastructure, it will help unlock stalled development, support local housing delivery, and ensure compliance with environmental regulations- all while protecting the Solent’s unique and sensitive natural environment.
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A former farmland site in Stubbington is now a nature recovery area, reducing nutrient runoff into the Solent. The project has generated over 400 verified nutrient credits to support sustainable development in the region.
A new scheme in Winchester will reduce nutrient pollution in the River Itchen by upgrading council-owned septic tanks. This will generate verified nutrient credits, helping unlock housing development while protecting the area’s sensitive ecosystems.
