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MetricWater quality and pollution

Discharge pollutant-load reduction against baseline

Measurement answer

What this metric measures

Reports Discharge pollutant-load reduction against baseline under AWS International Water Stewardship Standard Version 3.0 while retaining the site or catchment population, reporting period, outcome area, requirement and certification applicability.

Specification

Metric specification

Result format
Structured table
Unit
mass per period and % change - source-defined AWS v3 reporting basis
Reporting basis
Annual or source-required monitoring period, with seasonal or monthly detail where applicable
Aggregation
Aggregate only observations with the same site or catchment, period, water source or discharge point, parameter, baseline, target, outcome area, unit and method.
Pillar
Environmental
Topic
Water quality and pollution
Controlled domain
Pollution
Entity type
Metric

Reporting boundary

The AWS-certified site and its identified surface-water and, where applicable, groundwater catchment, limited to the population and result fields named by the cited requirement.

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.

  • Measurement Authority

    AWS International Water Stewardship Standard

    Source evidence
    Publisher
    Alliance for Water Stewardship
    Edition
    Version 3.0, 22 March 2026
    Requirement
    Not Specified
    Relationship
    Defines Measurement
    Mapping outcome
    Direct Evidence
    Source locator
    Requirements 3.4.2; normative printed pages 10-23
    Open official framework source
  • Measurement Authority

    AWS International Water Stewardship Standard

    discharge-pollutant-load-reduction
    Publisher
    Alliance for Water Stewardship
    Edition
    Version 3.0, March 2026 (Version 2.0 transition through 22 March 2027)
    Requirement
    Conditional
    Relationship
    Maps Source Identity
    Mapping outcome
    Published
    Source locator
    AWS v3 requirements 3.4.2
    Open official framework source

Value structure

Dimensions and units

Unit
mass per period and % change - source-defined AWS v3 reporting basis
Reporting basis
Annual or source-required monitoring period, with seasonal or monthly detail where applicable

Unit meaning: Use mass per period and % change within the applicable AWS v3 site or catchment boundary and method.

Table fields and units

  • Discharge pollutant-load reduction against baseline
  • Site or catchment and reporting period
  • Measured value or structured result fields
  • Unit, parameter, baseline and target
  • Requirement, certification applicability, method and evidence notes

Published dimensions

  • site or catchment
  • reporting and baseline period
  • water source or discharge point
  • parameter or water-flow component
  • outcome area and target
  • certification applicability

Disclosure method

Formula information

Status
Not applicable
Formula type
Structured Disclosure

Disclosure form

Report the source-defined measured or structured result

AWS v3 establishes a bounded result and its monitoring or evaluation context but does not prescribe one universal formula across all sites, catchments, parameters and targets.

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 31 August 2026

    AWS International Water Stewardship Standard

    Publisher
    Alliance for Water Stewardship
    Edition
    Version 3.0, 22 March 2026
    Locator
    Requirements 3.4.2; normative printed pages 10-23

    Supports: The official standard establishes the identity and source boundary of Discharge pollutant-load reduction against baseline.

    Open official source

Use with context

Interpretation boundaries

Method disclosures required

Source-edition basis: Version 3.0, March 2026 (Version 2.0 transition through 22 March 2027)

  • Identify the site and mapped catchment boundary used.
  • State AWS v3 requirement code(s) 3.4.2 and gold applicability.
  • State period, baseline or target, measurement frequency, unit, method, data source, assumptions and exclusions.
  • Preserve water-flow components, quality parameters, outcome area and implementation or effectiveness fields instead of collapsing the result.

Record-specific limitations

  • A site result is not interchangeable with a catchment result.
  • Gold and Platinum identify certification applicability and do not create additional metric identities.
  • Comparability requires aligned populations, periods, units, parameters, baselines, targets and measurement methods.

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.