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A vineyard at Gloria Ferrer, IWCA winery in California. Rows of green vines are in the foreground. A center path leads to a white building perched in the hills in the background.

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. 

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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