As part of a strategic initiative, the Solent Mitigation Partnership is working to deliver upgrades to private septic tanks (domestic sewerage systems) across Hampshire starting in Bishop Sutton 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.
The development of the scheme was started in May 2026, and is designed to generate nutrient credits that developers in areas like Ropley and Ropley Dean can purchase to support housing and projects.
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.
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.
