Why ESG needs evidence, not estimates

Every organisation trying to report on its environmental impact faces the same problem. At some point, someone in the room asks, "Where did that number come from?"

For carbon, energy and waste, most businesses have at least some data to lean on. Bills, meter readings, supplier reports. But when it comes to reducing plastic bottle use, the numbers are often based on assumptions. Estimates. Rough calculations that nobody can properly audit.

That gap matters more than most sustainability managers realise.

The problem with 'we think we avoided X bottles'

There is a growing difference between organisations that can demonstrate their environmental impact and those that can only describe it. ESG reporting frameworks such as GRI, CDP, and the EU Taxonomy for Sustainable Activities increasingly emphasise the need for claims to be verifiable. Investors, auditors and procurement teams are all getting better at spotting the difference.

Saying 'we installed a refill station and believe it has reduced our bottled water consumption' is not the same as saying 'our refill station dispensed 4,300 litres in Q1, representing 8,600 avoided 500ml bottles and an estimated 697kg of CO2 equivalent.'

The first is a statement of intent. The second is an ESG evidence piece.

What the data actually looks like

A 500ml single-use PET bottle carries a carbon footprint of roughly 81g of CO2 equivalent across its full lifecycle, from raw material extraction through to disposal. Manufacturing the bottle requires around 162g of oil and seven litres of water. When you multiply those figures across a busy venue, a university campus or a public building, the numbers add up quickly.

Switching to mains-sourced, filtered water delivered through a smart refill station doesn't eliminate those emissions, but it substantially reduces them. Consuming tap water instead of bottled water reduces energy consumption by around 85% and greenhouse gas emissions by around 79% per serving. That is not a marginal improvement. It is a meaningful, reportable shift.

What makes refill stations different from older water provision solutions is the data layer they provide. Modern connected units track every dispense. That means organisations have access to actual usage volumes rather than projections, and can calculate avoided bottles and associated carbon savings based on what really happened rather than what they hoped would happen.

Why this matters for ESG reporting cycles

Many organisations are in the middle of their annual ESG reporting cycle right now. Sustainability teams are pulling together data for annual reports, investor disclosures and certification renewals. That is exactly when the gap between measurable impact and narrative impact becomes visible.

The challenge is not usually a lack of ambition. Most organisations want to report meaningfully on their environmental commitments. The challenge is that some of the initiatives they have invested in cannot produce granular output data. A policy change or a pledge to reduce single-use plastics is valuable. Still, without measurement behind it, it is difficult to include in a credible ESG report without inviting scrutiny.

A refill station that logs every dispense solves that problem. The data is there, it is consistent, and it can be translated directly into the metrics that reporting frameworks ask for: tonnes of CO2 avoided, litres of water dispensed, units of single-use plastic eliminated.

Avoiding greenwashing by building from the ground up

There is increasing regulatory and investor focus on greenwashing, the practice of claiming environmental credentials that cannot be substantiated. The consequences range from reputational damage to regulatory action. In that context, having real-time, auditable data behind your sustainability claims is not just useful. It is protective.

Organisations that can show exactly how much plastic they have kept out of the waste stream, backed by actual dispense data from their infrastructure, are in a different position from those relying on estimates. Their numbers can survive scrutiny. They can be included in reports, shared with auditors, and referenced in tender responses without qualification.

That kind of confidence in your own numbers is increasingly rare. It is also increasingly valuable.

The practical question for facilities and sustainability teams

If you are currently trying to pull together your ESG data and have water provision infrastructure in your building, it is worth asking whether that infrastructure is providing you with anything. Not just cold water, but data. Usage logs. Impact metrics. Something you can point to in a report and defend.

If it isn't, the infrastructure you have might still be doing well. You just cannot prove it. And in an environment where proof is increasingly the baseline expectation, that distinction matters.