Water Quality Improvement — Reducing Pollution and Storm Overflows
Definition
Two overlapping targets form this outcome:
- Storm overflows: 44% reduction in spills by 2030 (vs. 2021 baseline) — set in PR24
- Agricultural water quality: 40% reduction in N/P/sediment pollution by 2038 (12% interim by 2030) — set in Environment Act 2021 TDP
Both require coordinated action across water companies, farms, and regulators.
Contributing strategies
- water-sector-reform — PR24 (£104bn), Water White Paper reform proposals, accelerated infrastructure
- target-delivery-plans — Agriculture Water Quality TDP (four delivery pillars)
- farming-rural-policy-2025 — ELM as Pillar 2 delivery mechanism
- environmental-improvement-plan-2025 — EIP Goal 3: Water quality; broader biodiversity outcomes depend on water quality
Contributing actions (inputs → outputs → outcome)
| Input | Output | Contribution |
|---|---|---|
| PR24 £88bn upgrades | Reduced storm overflow capacity; nutrient removal | 44% overflow reduction by 2030 |
| EA inspection funding £5m → £12m (by 2029) | More farm inspections; compliance | 12% agricultural pollution reduction pillar |
| Slurry Infrastructure Grants (£108m) | Improved slurry storage; less run-off | Direct agricultural N/P reduction |
| ELM (SFI, Countryside Stewardship) | Buffer strips; nutrient planning; low-input grassland | Voluntary 3% contribution (Pillar 2) |
| Woodland/land use change | Riparian buffers; land take-out from production | 11% contribution from land use change |
| Farming Innovation Programme (£15m) | Novel fertilisers; bio-stimulants; separator tech | 14% contribution from innovation |
Commitments
- ea-storm-overflow-44pct-2030 — 44% reduction in storm overflow spills by 2030; owner: water companies/Ofwat
- defra-agri-water-quality-40pct-2038 — 40% reduction in agricultural N/P/sediment by 2038
- defra-agri-water-quality-12pct-2030 — 12% interim reduction by December 2030
Delivery status: at-risk
Assessment: at-risk, based on:
- Regulatory uncertainty: Water White Paper proposes abolishing Ofwat. PR24 determinations are already binding. Companies investing under a regulatory framework that will be restructured — chilling effect on discretionary investment beyond the mandated programme.
- Agricultural Pillar 2 vulnerability: ELM voluntary uptake (Pillar 2) contributes 3% toward the 40% target. SFI January 2026 simplification reduces and restructures the very actions that deliver this pillar.
- Coordination gap: Agricultural run-off affects the same watercourses water companies must improve under PR24. The two delivery systems (Defra/ELM and Ofwat/PR24) are not formally coordinated in catchment-scale planning.
- Lead times: Some agricultural innovation measures (novel fertilisers, bio-stimulants) have trial completion dates of 2026-2028 — results needed to confirm delivery feasibility before 2030 interim milestone.
Delivery history
| Date | Update |
|---|---|
| April 2023 | £1.6bn accelerated water infrastructure announced (pre-PR24) |
| December 2024 | PR24 Final Determinations published; £104bn programme begins |
| 2024-25 | Water resources performance: leakage at 20-year low |
| January 2026 | Water White Paper published; single regulator proposed |
| December 2025 | Agriculture Water Quality TDP published; four-pillar framework confirmed |
Tensions
- water-regulator-reform-pr24-uncertainty — Ofwat being proposed for abolition while running active £104bn PR24 cycle
- sfi-simplification-water-quality — SFI simplification restructures ELM (Pillar 2 delivery mechanism); may reduce voluntary water quality actions