AMP8 is the biggest capital cycle in UK water sector history — £104bn between 2025 and 2030, with Ofwat's PR24 outcomes framework tying company financial performance to measurable asset delivery. Since April 2020, Ofwat has taken £416m in enforcement action against seven companies for wastewater failures. Maintenance is now a regulatory scorecard. Every pump inspection, every DWI sample, every storm overflow response either supports a performance commitment or contributes to underperformance payments. Oxmaint gives UK water teams one platform for AMP8 evidencing. Book a demo to see AMP8-ready workflows in action.
AMP8 · 2025-2030 · THE INVESTMENT SCALE
£104bn approved. £38bn of allowances tied to delivery. First sector-wide assessment: December 2026.
£104bn
Total PR24 investment approved by Ofwat — nearly 4× AMP7
£38bn
Ring-fenced allowances Ofwat will track under the AMP8 delivery framework
£12bn
Committed to reducing storm overflow spills 45% by 2030 vs 2021 baseline
8,200km
Water mains scheduled for renewal across the AMP8 programme
The PR24 Outcomes Framework — Where Maintenance Data Becomes Money
Ofwat's PR24 outcomes framework uses performance commitments (PCs) tied to symmetric Outcome Delivery Incentives (ODIs) — hit the target, earn a reward; miss it, incur an underperformance payment against customer bills. For AMP8, the framework applies across a set of common performance commitments every England and Wales company must report against, plus two or three bespoke commitments per company. The delivery scorecard below is what water utility maintenance teams are actually measured against.
WATER SUPPLY
Water Supply Interruptions · Minutes lost per property per year
Leakage · Total leakage in Ml/day
Compliance Risk Index (CRI) · DWI drinking water quality
Mains Repairs · Bursts per 1,000km
Unplanned Outage · Water treatment works capacity lost
WASTEWATER
Storm Overflows · Spills per overflow per year
Pollution Incidents · Cat 1-3 incidents per 10,000km sewer
Internal Sewer Flooding · Incidents per 10,000 properties
Total Pollution Incidents · All categories combined
Discharge Permit Compliance · Numeric permits met
CUSTOMER / ASSET
C-MeX · Customer measure of experience
D-MeX · Developer measure of experience
Asset Health · Mains, sewers, treatment works condition indices
GHG Emissions · Operational carbon footprint
Where Maintenance Directly Drives ODI Performance
Every performance commitment above traces back to specific maintenance activity. Reactive-run pumps translate to unplanned outages. Deferred CSO inspections translate to spill incidents. Missed DWI sample follow-ups translate to CRI failures. The linkage between maintenance execution and regulatory outcome is direct — and the AMP8 delivery framework specifically demands documented, traceable maintenance evidence. Oxmaint links every work order to the asset it protects and the performance commitment it supports, so evidencing becomes a query rather than a project. Sign up free to structure AMP8 evidencing from day one.
Water vs Wastewater — Fundamentally Different Asset Maintenance
A pump on the potable supply side and a pump on the wastewater side share the same nameplate but almost nothing else — different failure modes, different regulatory frameworks, different consequence profiles. UK water utilities operate both sides of the ledger and need a CMMS that handles the distinct maintenance disciplines rather than treating everything as generic rotating equipment.
POTABLE WATER
Supply-Side Assets
Water treatment works (WTW) — coagulation, filtration, UV
Service reservoirs & storage tanks
Booster pumping stations
Distribution mains & PRVs
Chlorination & dosing systems
Regulator: DWI — drinking water quality
Consequence: CRI failure, boil-water notice
WASTEWATER
Treatment & Network Assets
Sewage treatment works (STW) — SBR, ASP, tertiary
Combined sewer overflows (CSOs) & event duration monitors
Storm tanks & screening plant
Blowers, MBRs, digesters & centrifuges
Rising mains & pumping stations
Regulator: EA / NRW — permit compliance, spills
Consequence: Pollution incidents, enforcement
See AMP8-Ready Asset Management Live
Walk through PC-tagged work orders, asset-health condition indices, EDM data linkage for CSO monitoring, DWI sample follow-up workflows, and AMMA-aligned evidence packs — configured against your water utility asset register. Thirty minutes with the Oxmaint team.
Asset Management Maturity — Where Ofwat Expects You to Be
Ofwat's Asset Management Maturity Assessment (AMMA), refreshed under the June 2025 proposal, is how the regulator now benchmarks companies against each other. It's a five-stage progression from reactive record-keeping through to fully integrated risk-based decision-making. Companies scoring at the lower end face heightened scrutiny; those at the top gain regulatory latitude and outperformance credibility. Understanding where you sit is the first step to understanding what AMP8 evidencing you actually need.
1
Reactive
Repairs after failure. Little structured record-keeping.
2
Planned
Calendar-based PM in place. Asset register partial.
3
Optimised
Risk-based PM, structured RCM, evidenced decisions.
4
Predictive
Condition-based intervention, integrated telemetry.
5
Integrated
Whole-life value optimised across investment horizons.
Ofwat's June 2025 proposal expects AMP8 companies to demonstrate progression toward stages 3-4 with evidenced maintenance data, condition-based decisions and risk-based capital planning.
Progression up the maturity ladder isn't about buying more software — it's about producing the evidence trail Ofwat looks for. Sign up free to move up the AMMA maturity ladder.
Expert Perspective — Why AMP8 Punishes Fragmented Maintenance Data
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The AMP8 delivery framework is fundamentally different from previous cycles because Ofwat isn't just measuring outcomes — it's assessing the maintenance evidence chain that produced them. A company that hits its pollution incident target but can't produce the underlying inspection records, condition data and intervention history for the assets involved will still face scrutiny. The £416m of enforcement action already taken across the sector didn't happen because companies had bad intentions — it happened because the audit trail behind their reported performance couldn't withstand challenge. Water utilities entering AMP8 with maintenance data scattered across spreadsheets, legacy CMMS platforms and shift logs are structurally exposed. Ones with a single, PC-tagged evidence chain have already won the argument before it's asked.
01
PC-tagged work orders
Every WO tags to the performance commitment it supports. ODI evidencing becomes a filter, not a project.
02
EDM & telemetry linkage
Event Duration Monitor data on CSOs ties directly to maintenance response records for spill investigations.
03
DWI follow-up enforced
Sample-fail follow-up work orders cannot close without documented investigation and re-sample evidence.
04
Asset-health condition index
Structured condition scoring per asset class feeds AMMA evidencing and AMP8 asset-health commitments.
Who Uses Oxmaint Across UK Water & Wastewater
The platform is used by the specific operational roles that own AMP8 delivery across UK water companies: asset managers configuring PC-tagged maintenance programmes across water and wastewater estates, reliability engineers running condition indices on WTW and STW critical assets, catchment operations managers coordinating CSO monitoring and response workflows, treatment works managers running DWI/EA compliance workflows, network operations teams managing burst response and leakage programmes, compliance managers producing ODI evidence packs, and executive teams tracking AMP8 delivery against Ofwat's monitoring framework. Each role sees the same asset data filtered to their view — PC scorecard, spill dashboard, DWI sample queue or AMMA evidence pack. Sign up free to configure AMP8 workflows for your team.
Getting AMP8-Ready in 30-60 Days
Deployment starts by importing your water and wastewater asset register — treatment works, pumping stations, service reservoirs, mains, sewers, CSOs, EDM sensors, blowers, UV and dosing systems. Existing SCADA and telemetry from Emerson, ABB, Siemens or specialist water-industry platforms integrate via OPC-UA, MODBUS and direct APIs — most water companies already have the sensor infrastructure, so integration rather than instrumentation is the primary task. PC-tag templates configure per company against the PR24 outcomes framework. DWI sample-fail follow-up workflows and EDM-linked CSO investigation templates deploy inline. Most companies see PC-tagged work order flow live within 30-45 days on primary treatment works and rising mains; portfolio-wide AMMA-aligned evidencing typically inside two quarters. Book a walkthrough to see live UK water utility deployments.
Turn AMP8 Maintenance Into Regulatory Advantage
Oxmaint gives UK water and wastewater teams one platform for AMP8-ready asset management — PC-tagged work orders, DWI and EA compliance workflows, EDM-linked CSO monitoring, asset-health condition indices and AMMA-aligned evidence packs.
Frequently Asked Questions
What is AMP8 and why does it matter for water utility maintenance?
AMP8 is the eighth Asset Management Period running from April 2025 to March 2030, funded through Ofwat's PR24 price review with approximately £104bn of approved investment across England and Wales water companies — nearly four times the AMP7 total. Ofwat's PR24 outcomes framework ties company revenue directly to measurable performance commitments through symmetric Outcome Delivery Incentives, with underperformance payments applied against customer bills. For maintenance teams, this means every work order, inspection and asset intervention either supports a performance commitment or contributes to enforcement risk. Structured, evidenced, PC-tagged maintenance data is now a regulatory requirement, not a nice-to-have.
What are the key AMP8 performance commitments?
Common performance commitments applying to every England and Wales company span three categories. Water supply: interruptions per property, leakage in Ml/day, DWI Compliance Risk Index, mains bursts per 1,000km, and unplanned outage capacity. Wastewater: storm overflow spills per overflow, pollution incidents per 10,000km sewer, internal sewer flooding, total pollution incidents, and numeric discharge permit compliance. Customer and asset: C-MeX and D-MeX customer measures, asset health condition indices, and operational GHG emissions. Companies may also propose two or three bespoke commitments reflecting regional priorities. All carry symmetric ODIs — outperformance reward or underperformance payment.
How does maintenance data support Ofwat's AMMA assessment?
Ofwat's Asset Management Maturity Assessment (updated under the June 2025 proposal) benchmarks water companies on a five-stage progression from reactive record-keeping to fully integrated whole-life value decision-making. Higher AMMA scores demonstrate structured, evidenced asset management and earn regulatory latitude. The evidence Ofwat looks for is exactly what a well-configured CMMS produces — condition indices per asset class, risk-based PM decisions with documented rationale, integrated telemetry-driven interventions, and traceable outcomes from maintenance activity to reported performance. Companies operating on spreadsheets and disconnected systems struggle to demonstrate anything above stages 1-2.
Can Oxmaint integrate with our SCADA and EDM telemetry?
Yes. Most UK water companies already have SCADA infrastructure (Emerson Ovation, ABB, Siemens SPPA, water-industry specialist platforms), Event Duration Monitor deployments on CSOs, and historian systems. Oxmaint's integration layer supports OPC-UA, MODBUS TCP and direct APIs to pull condition data, EDM spill duration data and treatment works telemetry into the maintenance workflow. This is critical for AMP8 evidencing because pollution incidents and CSO performance commitments require the EDM-to-maintenance-response evidence chain — proving that when a spill event was detected, the maintenance response was appropriate, timely and documented.
How quickly can a water company be AMP8-ready with Oxmaint?
Most UK water companies see PC-tagged work order flow live within 30-45 days on primary treatment works, rising mains and CSO estates. DWI sample follow-up workflows and EDM-linked investigation templates typically deploy within the same window. Portfolio-wide AMMA-aligned evidencing across the full asset base — thousands of pumping stations, treatment works, service reservoirs and network assets — typically completes within two quarters. Given Ofwat's first sector-wide AMP8 delivery assessment falls in December 2026, companies configuring their evidencing framework in 2026 have the runway to enter the first assessment with structured, defensible maintenance data.
