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For Auditors

Comprehensive GHG Emissions Accounting

To achieve and maintain IWCA membership, a winery must regularly carry out Scopes 1, 2, and 3 greenhouse gas (GHG) emissions inventories of its operations.


To ensure a consistent high standard, we require that inventories be verified to the ISO-14064-1 standard.

IWCA works closely with ISO-14064-3 accredited and CDP accredited auditors to: 

  • ensure a robust standard and consistency in GHG measurement and accounting. 

  • verify that wineries meet IWCA membership requirements and achieve consistent emissions reductions over time.

A close-up photo in a vineyard at Château Troplong Mondot, IWCA member winery in France. In the background are flower cover crops. In the foreground are dry branches from pruning.

IWCA Resources & Documentation

IWCA Audit Summary Form

Screenshot of IWCA's audit summary form in Excel.

PURPOSE: To summarize an IWCA member or applicant member’s verified GHG inventory.

The Audit Summary Form is to be filled out by ISO-14064-3 or CDP accredited auditors. The Form should be submitted to IWCA yearly (or every other year, depending on a winery’s size) to confirm that the winery meets IWCA membership requirements and is achieving ongoing emissions reductions. 

Select List of Accredited Audit Firms

An IWCA winery must utilize an audit firm that is either ISO-14064-3 accredited (or CDP accredited as a solutions provider in CDP’s Greenhouse Gas Emissions Inventory services area) when seeking an ISO-14064-1 audit of its GHG emissions inventory.

We have compiled a non-exhaustive list of firms that meet this standard. (Note: This does not represent IWCA's endorsement) To recommend a firm to be added to the list, please contact us.

GHG Emissions Inventory Guidance

Screenshot of IWCA's GHG emissions inventory guidance document.

PURPOSE: Outlines the protocols all IWCA members must follow when measuring their GHG emissions.

IWCA's GHG Inventory Scopes Guidance Document outlines the categories of emissions that must be accounted for under a comprehensive Scopes 1, 2, and 3 inventory.

Audit Summary Form

Audit Services

If you are an ISO-14064-3 accredited or CDP accredited audit firm and would like to be included among the list of auditors that IWCA provides to its members, please get in touch!

A small solar panel installation in a vineyard at Emina Ribera, IWCA winery in Spain.
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