WT1: Reuse and Recycling
Assessment Instructions
Participants must report this metric at the asset level.
GRESB automatically populates this indicator in the assessment response once participants have aggregated asset-level data from the Asset Portal.
When using the Asset Spreadsheet to upload asset-level data, GRESB recommends reviewing the instructions below in conjunction with the corresponding spreadsheet tab. The Cell Code column in the Input section indicates where to report each metric in the spreadsheet.
Asset Portal Guide Click here to download a read-only version of the Asset Spreadsheet.
Input: How do I complete this metric?
Data
Cell Code
Instructions
Reused and recycled
X4-AA4
See definitions of the water activities below:
On-site water capture: The on-site collection of rainwater, fog, or condensate, which is treated and purified for reuse and/or recycling.
On-site water extraction: The on-site extraction of groundwater, which is treated and purified for reuse and/or recycling.
On-site water reuse: The reuse of greywater and/or blackwater in on-site activities, like toilet flushing or cooling processes.
Off-site water purchased: Purchase, delivery, and use of recycled water from a third-party facility.
Validation: What evidence is required?
This indicator is subject to automatic validation. No evidence is required. Refer to the page below for guidance on how to resolve automatic validation errors and warnings. Validation Basics
Scoring
Reuse and recycling influences water reuse and recycling (1 point total) score calculation.
Water Reuse and Recycling
Step 1: Calculate Asset-Level Scores
The Water Reuse and Recycling score is split into two parts.
Part 1 (0.25 points): Water Reuse & Recycling
Each asset earns 0.25 points if any of its water consumption was reused or recycled on-site during the reporting year.
Part 2 (0.75 points): Improvement
The performance improvement score for each asset is determined based on two elements:
First, GRESB calculates the percentage of water reuse and recycling (p) for the current reporting year for each asset. Assets with no water reuse or recycling are assigned a % of 0, resulting in a score of 0.
Second, GRESB determines an improvement score (i) by comparing the asset's year-on-year improvement in % water reuse and recycling to a benchmark group based on the improvements of other assets within the same property sub-type and country. Only positive improvements are considered; values ≤ 0 are ignored. These two elements are combined using the following formula, where (p) is the percentage of reused or recycled water, and (i) is the improvement score:
Score = (100 + p) / 200 * p / 100 + (100 - p) / 200 * i
Step 2: Aggregate to the Property Subtype | Country Level
GRESB aggregates the asset-level scores to each property sub-type and country combination, using a weighted mean calculated by multiplying floor area by the percentage of ownership and the length of ownership period in the reporting year.
Step 3: Aggregate to the Portfolio Level
GRESB aggregates the scores for each property sub-type and country into a single portfolio score, weighted by the gross asset value (GAV) for each property sub-type and country.
Frequently Asked Questions
How do I report recycled water usage if it's part of my regular water supply and not purchased from a dedicated recycled water supplier?
If your regular water supplier certifies that a portion of their overall supply is recycled water, you can report that portion as "Off-site water purchased" under "Reused and Recycled," even if you don't purchase from a dedicated recycled water supplier.
How does GRESB construct the benchmarks used to score performance metrics?
First, an attempt is made to construct a benchmark by grouping values from assets with the same Property Sub-Type and located in the same Country. If there are not at least 20 values from 5 distinct reporting entities, the Property Sub-Type classification and then the Country specificity are gradually decreased.
For example, the Property Sub-Type becomes Property Type and then Property Sector. Then the specificity of the Country is decreased to Sub-Region, Region, Super-Region, and Global.
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