Exploring Customer Feedback: How We Measure Value for Money in Water Treatment

Written by Craig "The Water Guy" Phillips

We measure value for money by listening closely to what customers tell us — and what the numbers quietly reveal. When nine in ten customers say they're satisfied with drinking water but only eight in ten feel the same about sewerage, that gap signals exactly where investment needs to go. We combine satisfaction scores, billing fairness perceptions, and willingness-to-pay research to make every pound count. Stick with us and we'll show you exactly how it all works.

Key Takeaways

• Customer satisfaction surveys, like CCW, reveal ~90% satisfaction with drinking water, highlighting direct experiences such as taste, odour, and reliability.
• A 5-point satisfaction gap between water and sewerage services redirects investment priorities toward odour mitigation, flooding prevention, and billing fairness.
• Willingness-to-pay research uses discrete choice experiments to quantify customer priorities, ensuring investments reflect genuine value while keeping bills fair.
• Metered, tiered billing combined with transparent rate reviews signals responsible money management, strengthening customer trust in utility charges.
• Regulators like Ofwat require demonstrated customer value before approving investments, ensuring only projects where benefits outweigh costs enter final programmes.

What Does Customer Feedback Actually Reveal About Water Value?

When customers tell us they're satisfied with their drinking water, what're they actually measuring? Surveys show roughly 90% satisfaction with drinking water versus 85% for sewerage—but that gap reveals something important: customers are rating what they experience directly, like taste, odour, and reliability.

Here's the problem. That feedback misses the full picture. Attributes like environmental quality and network-wide standards don't show up in satisfaction scores because customers rarely see them.

Meanwhile, revealed-preference signals—bottled water purchases, house-price differentials—capture private compensation but systematically understate total societal value by ignoring consumer surplus and non-purchasers' concerns.

How Do Low Satisfaction Scores Redirect Water Treatment Priorities?

Behind that 5-point satisfaction gap between water and sewerage lies a powerful signal utilities can't ignore. When CCW data shows sewerage scoring 85% against water's 90%, regulators and operators don't just note the difference—they act on it.

Low scores trigger a cascading reallocation of investment priorities:

1. Odour and flooding mitigation moves up the project queue
2. Economic optimisation tools rank ~20,000 projects by benefit-cost ratio
3. Willingness-to-pay evidence justifies spending beyond legal minima
4. Vulnerability indicators redirect resources toward affordability and continuity

We're watching satisfaction data do real regulatory work here. Ofwat requires WTP evidence before approving targeted improvements, so persistent low scores essentially become the funding argument. That's how a dissatisfied customer becomes a catalyst for infrastructure change.

The Link Between Billing Fairness & Customer Trust

Billing fairness isn't just an accounting principle—it's the foundation of whether customers believe a utility is on their side. UK Consumer Council for Water data tells a revealing story: water services achieve roughly 90% satisfaction, yet sewerage satisfaction drops to 85%. That gap traces directly to how charges are perceived and explained.

When we separate enterprise funds, link wastewater charges transparently to actual treatment costs, and replace flat fees with volumetric structures, we shift the narrative. Customers stop feeling like they're subsidising heavier users and start seeing genuine value alignment. Metered, tiered billing—backed by regular rate reviews and clear public communication—signals that we're managing their money responsibly. Tools like EFCN technical assistance and UNC's Rates Analysis Tool help us demonstrate that commitment consistently.

Why Customer Willingness to Pay Shapes Water Service Investment

Transparent billing earns trust, but it's only half the story—we also need to show customers that their money funds improvements they actually value. Willingness-to-pay (WTP) research tells us precisely that. Through discrete choice experiments, we quantify what customers genuinely prioritise:

1. Reducing supply interruptions by frequency and duration
2. Eliminating discolouration and odour complaints
3. Preventing sewage flooding and pollution incidents
4. Delivering measurable environmental improvements

These aren't abstract numbers. Regulators like Ofwat require us to prove benefits exceed costs before approving investment programmes. WTP estimates feed directly into optimisation tools that rank thousands of potential projects, shaping what gets built each five-year cycle.

When we get these values right, investment decisions reflect real customer priorities—not assumptions—keeping bills fair while delivering services people actually want.

How Do Regulators Use Customer Evidence to Set Fairer Price Limits?

When Ofwat opens a price review, it doesn't simply take our word that a £500 million investment programme is justified—it demands proof that customers actually value what we're proposing to build. We supply that proof through stated preference surveys, discrete choice experiments, and mixed logit models that quantify exactly what customers will pay to avoid sewage flooding, discolouration, or river quality decline.

Those willingness-to-pay figures then feed directly into optimisation tools like LEADA, where our engineers stack thousands of projects against failure-risk schedules and rank them by net benefit. Ofwat scrutinises heterogeneity controls, validates our scaling methods, and stress-tests affordability. Only when benefits measurably outweigh costs does an investment earn its place in our final programme—and ultimately, in your bill.

Frequently Asked Questions

How Is Water Valued?

We value water through customer surveys that capture what you'd pay for cleaner taste, fewer interruptions, and healthier rivers — combining those insights with market data to justify every investment we make.