Your GRESB Water Score Doesn't Reflect
What You've Already Achieved.
Hotel REIT portfolios routinely carry verified water savings in the field that never reach their GRESB water score. The performance exists. The documentation gap is the problem — and it is fixable within one reporting cycle.
Performance Indicator Analysis
Water is the weakest indicator
in most hotel REIT portfolios.
Across the DiamondRock portfolio, every management indicator scores at or near 100%. The gap is entirely in Performance — and within Performance, Water and Waste are the floor.
Source: DiamondRock Hospitality Company · GRESB 2025 Benchmark Report
Score Trajectory
Peer Ranking — Hotel / Americas
Water is specifically addressable in a way that Waste (behavioural) and Energy (capital expenditure) are not. IoT monitoring + bill validation + GRESB-formatted documentation can move water from 67.7% toward 90%+ — without major capital spend and within a single reporting cycle.
The Core Problem
The savings are real.
The score doesn't know that yet.
Verified field performance and GRESB score are disconnected because the loop between operational savings and documentation has never been closed across the full portfolio.
Verified savings at one property don't improve the portfolio-level GRESB score. Every asset needs the same instrumentation, documentation, and GRESB-formatted data — before the score moves.
GRESB Water Indicators
WST addresses three indicators
simultaneously.
Most water programmes address one indicator at a time. WST's methodology closes WT1, MR3, and RA4 through a single coordinated engagement — covering data, monitoring, and risk documentation in one programme.
WST's GRESB Methodology
GRESB Solution Provider Partner
WST is a GRESB Solution Provider Partner. Our datasets are structured to satisfy GRESB submission requirements — not adapted from operational reports after the fact. 150+ institutional investors use GRESB benchmarks in capital decisions.
"Verified savings across 31 assets. Reported at the GRESB level. WST gave us the data to have a different conversation with our investors."
Portfolio Manager · DiamondRock Hospitality CompanyDiamondRock holds a 4-star GRESB rating and an A Public Disclosure rating — first in its US Hotel peer group. Their water score remains at 67.7%. This is the gap WST exists to close: verified performance that hasn't scaled across all 31 assets in the documentation.
Engagement Model
Two ways to engage WST.
Both start with a 90-minute session.
WST structures around your investment cycle — not a product catalog. The starting point is always a working session to map your current water data coverage, identify the GRESB gaps, and quantify the NOI impact of closing them.
- ✓Current WT1/MR3/RA4 indicator gap analysis
- ✓Asset-level consumption data formatted for GRESB submission
- ✓Water intensity benchmarking vs. Hotel peer group
- ✓Prioritised improvement roadmap with score impact estimates
- ✓Investment committee–ready findings documentation
- ✓Ara AI automated utility bill collection — portfolio-wide
- ✓Real-time IoT monitoring with anomaly alerts and cost translation
- ✓Annual GRESB water data preparation and submission support
- ✓Quarterly portfolio water performance reporting
- ✓Verified savings documentation for IC and ESG disclosure
- ✓Investment committee briefings and LP disclosure support
say about your portfolio?
A 90-minute portfolio visibility session maps your current water data coverage, identifies the GRESB gaps, and outlines the NOI impact of closing them. No obligation.