Water discharged by quality classification
Measurement answer
What this metric measures
Reports discharged-water volume by water-quality classification, including freshwater discharged, defined as water with Total Dissolved Solids of 1,000 mg/L or less.
Specification
Metric specification
- Result format
- Structured table
- Unit
- m3 — source-defined reporting unit
- Reporting basis
- Organization reporting period
- Aggregation
- Sum of discharged-water volumes within each reported water-quality classification.
- Pillar
- Environmental
- Topic
- Water discharge
- Controlled domain
- Water and marine resources
- Entity type
- Metric
Reporting boundary
Water discharged by the reporting organization; the extracted evidence does not further specify operational, value-chain, geographic, or facility scope.
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 DisclosureC2.1
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2024
- Requirement
- Conditional
- Relationship
- Reuses Canonical Metric
- Mapping outcome
- Reused
- Source locator
- p. 60, Section 3.1 core global metric application table, Pollution/pollution removal, Metric no. C2.1
- Adopting DisclosureC2.1
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2024
- Requirement
- Conditional
- Relationship
- Reuses Canonical Metric
- Mapping outcome
- Reused
- Source locator
- Page 65; Section 3.1 core global metric application table; Pollution/pollution removal; Metric no. C2.1
- 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
- TNFD Recommendations, September 2023, page 84, table row C2.1.
- Adopting Disclosure38b2ae810efcc9941285
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 84, table row C2.1 | TNFD Recommendations, September 2023, page 84, table row C2.1.
Value structure
Dimensions and units
- Unit
- m3 — source-defined reporting unit
- Reporting basis
- Organization reporting period
Unit meaning: Values use m3 under the disclosed TNFD Recommendations method, period, location and reporting boundary.
Table fields and units
- water-quality classification
- definition or threshold
- discharged water volume
- unit
- reporting period
- boundary or location where reported
- measurement method
Published dimensions
- water-quality classification
- reporting period
- reporting entity
- geography or discharge location where reported
- direct versus proxy measurement method where applicable
Calculation method
Formula information
- Status
- Specified
- Formula type
- Sum
Formula
V_q = Σ_i v_i,q, where V_q is the volume of water discharged in quality classification q and v_i,q is the discharged volume for discharge source or location i classified as q.Apply the source-defined TNFD Recommendations method only within the disclosed location, ecosystem and value-chain boundary. The source provides a reportable volume and an explicit freshwater quality threshold. In accordance with the source-specific instruction to preserve C2.1 wastewater-quality fields as a structured family rather than separate metrics for each table cell, this is published as a quality-classified water-discharge table with freshwater as an evidenced classification.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
V_q | Total discharged water volume by quality classification | Aggregated volume of water discharged for a specified water-quality classification during the reporting period. | m3 |
v_i,q | Discharged water volume at source or location | Volume discharged from source or location i that is classified in water-quality class q. | m3 |
q | Water-quality classification | Reported water-quality class; for this evidenced row, freshwater is water with Total Dissolved Solids of 1,000 mg/L or less. | classification |
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
- TNFD Recommendations, September 2023, page 84, table row C2.1.
Supports: The official TNFD Recommendations source supports the identity, boundary and method basis of “Water discharged by quality classification”.
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.
- Disclose the water-quality classification used for each reported volume.
- For the freshwater row, disclose that freshwater means water with Total Dissolved Solids of 1,000 mg/L or less.
- Disclose the organizational and geographic boundary used where this is not otherwise apparent.
- Disclose whether reported volumes are directly measured or estimated/proxied where applicable.
Record-specific limitations
- This candidate evidences only the freshwater classification and does not evidence the complete set of quality classifications in the C2.1 family.
- Freshwater is defined in the source as water with Total Dissolved Solids of 1,000 mg/L or less.
- The extracted evidence does not specify whether volumes must be reported by facility, priority location, direct operations, or value-chain stage.
- This is an Annex 2 optional additional metric under the TNFD Recommendations September 2023, not an Annex 1 core global metric.
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.