Wastewater volume reduction relative to baseline
Measurement answer
What this metric measures
Reports the decrease in wastewater volume, in cubic metres, relative to a disclosed baseline, including the measurement boundary and method used.
Specification
Metric specification
- Result format
- Single value
- Unit
- m³ — source-defined reporting unit
- Reporting basis
- Reporting period compared with a stated reference baseline period
- Aggregation
- Report the wastewater-volume reduction for the stated organizational boundary; retain baseline and reporting-period volumes where reductions are aggregated.
- Pillar
- Environmental
- Topic
- Water and wastewater management
- Controlled domain
- Water and marine resources
- Entity type
- Metric
Reporting boundary
Wastewater volume within the reporting organization's stated operational and value-chain boundary, relative to the disclosed baseline.
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD Recommendations
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Page 90, Table 8, A2.0
- Adopting Disclosure7dd29a95c8df3af13e30
TNFD Recommendations
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Requirement
- Not Specified
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Page 90, Table 8, A2.0
Value structure
Dimensions and units
- Unit
- m³ — source-defined reporting unit
- Reporting basis
- Reporting period compared with a stated reference baseline period
Unit meaning: Values use m³ under the disclosed TNFD Recommendations method, period, location and reporting boundary.
Table fields and units
- baseline period
- reporting period
- baseline wastewater volume (m³)
- reporting-period wastewater volume (m³)
- wastewater volume reduction (m³)
- boundary
- site or location
- measurement method
Published dimensions
- baseline period
- reporting period
- organizational boundary
- operational or technological improvement
- site or location where applicable
- direct versus proxy measurement method
Calculation method
Formula information
- Status
- Specified
- Formula type
- Difference
Formula
R = V_baseline − V_reportingApply the source-defined TNFD Recommendations method only within the disclosed location, ecosystem and value-chain boundary. Annex 2 metric A2.0 identifies an independently reportable wastewater-volume reduction relative to baseline and supplies a volumetric unit and change-from-baseline value shape. It is an optional additional TNFD metric rather than an Annex 1 core metric.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
R | Wastewater volume reduction | Decrease in wastewater volume relative to the stated baseline. | m³ |
V_baseline | Baseline wastewater volume | Wastewater volume in the disclosed reference baseline period. | m³ |
V_reporting | Reporting-period wastewater volume | Wastewater volume in the reporting period using the stated boundary and method. | m³ |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 27 August 2026
Recommendations of the Taskforce on Nature-related Financial Disclosures
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- September 2023
- Locator
- Page 90, Table 8, A2.0
Supports: The official TNFD Recommendations source supports the identity, boundary and method basis of “Wastewater volume reduction relative to baseline”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: Recommendations of the Taskforce on Nature-related Financial Disclosures, September 2023.
- Baseline period and baseline wastewater volume.
- Reporting-period wastewater volume.
- Organizational, operational, site, and value-chain boundary included.
- Whether the result is directly measured or estimated and the measurement method used.
- Material technological or operational improvements associated with the reported reduction.
Record-specific limitations
- The reported reduction is dependent on the selected baseline period and consistency of the wastewater-volume measurement boundary.
- A reduction in volume does not indicate wastewater quality, receiving-water condition, or ecological outcome.
- Results should not be aggregated across sites with materially different boundaries or measurement methods without disclosure.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.