Nutrient Neutrality in The Solent
n eueuinghtwThe affected areas in the Solent catchment cover a number of larger towns and cities, including Southampton, Portsmouth, Fareham, Havant, Winchester, Eastleigh, Waterlooville and Andover. A detailed map of the area is shown below, and e also have a full showig
due to excess nitrogen levels. This region includes the following Local Planning Authorities (LPAs)
- Basingstoke and Deane LPA
- Chichester LPA
- East Hampshire LPA
- Eastleigh LPA
- Fareham LPA
- Gosport LPA
- Havant LPA
- Isle of Wight LPA
- New Forest LPA
- New Forest National Park LPA
- Portsmouth LPA
- South Downs National Park LPA
- Southampton LPA
- Test Valley LPA
- West Berkshire LPA
- Wiltshire LPA
- Winchester LPA
The affected areas in the Solent catchment cover a number of larger towns and cities, including Southampton, Portsmouth, Fareham, Havant, Winchester, Eastleigh, Waterlooville and Andover. A detailed map of the area is shown below, and we also have a full U K Nutrient Neutrailty Map show
ing the issue nationally.
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Solent Nutrient Neutrality Map
Market conditions as of January 2023
We would characterise the mitigation market in the catchment as acceptable due to a functioning market supplying nitrogen credits. Mitigation is being priced such that costs are around of £4,000 to £7,500 per house.
Some wastewater treatment works have nutrient stripping. New houses currently require between 1 and 2.7 kg of nitrogen mitigation per house. This creates significant opportunities for landowners looking at mitigation schemes.
We forecast demand outstripping supply for at least the next 2 years, despite new schemes coming online (see below).
Water Treatment Upgrades
There are approximately 72 wastewater treatment works in the Solent Nutrient Neutrality area. None of these works are scheduled for an upgrade over the current upgrade cycle (AMP7), running to 2025. 7 of these works are currently operating at technically achievable limits (TAL) for nitrogen removal.
In order to meet the upgrade requirements that may be brought in under the Levelling Up and Regeneration Bill, referred to as the ‘TAL upgrades’, 16 treatment works will be upgraded to have nitrogen removal technologies by 2030. This means 59 treatment works will remain above the most stringent nitrogen removal requirements. Developments connecting to these treatment works will need more mitigation than those connecting to the 23 treatment works that will be operating at TAL from 2030.
As per our research into water treatment upgrades, we do not believe that it is likely that the water companies will be able to deliver all the upgrades in this cycle.
Planned notable nutrient mitigation schemes in The Solent Region
PUSH Nutrient Mitigation Schemes
There are large number of nitrogen mitigation schemes in the Solent. They are administered through the the PUSH group which coordinates the provision of nitrogen mitigation in the Solent region. Most of these schemes are using agricultural land abandonment to generate mitigation, which is an expensive and land intensive approach to nutrient mitigation.
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