diff --git a/.github/workflows/ats-ci.yml b/.github/workflows/ats-ci.yml
index 294d50c25..6379b7064 100644
--- a/.github/workflows/ats-ci.yml
+++ b/.github/workflows/ats-ci.yml
@@ -6,12 +6,15 @@ on:
       - '**'
   push:
     branches:
-      - '**'
+      - master
     tags-ignore:
       - ats-*
+  pull_request:
+    branches:
+      - master
 
 jobs:
-  build:
+  build: 
     strategy:
       matrix:
         os: [ ubuntu-latest, ubuntu-24.04-arm ]
@@ -28,7 +31,11 @@ jobs:
       id: branch
       working-directory: Docker
       run: |
-        echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        if [ "${{ github.event_name }}" = "pull_request" ]; then
+          echo "ATS_BRANCH=${{ github.event.pull_request.head.ref }}" >> $GITHUB_ENV
+        else
+          echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        fi
     - name: Does Amanzi branch of the same name exist?
       id: amanzi_branch
       run: |
@@ -103,7 +110,11 @@ jobs:
       id: branch
       working-directory: Docker
       run: |
-        echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        if [ "${{ github.event_name }}" = "pull_request" ]; then
+          echo "ATS_BRANCH=${{ github.event.pull_request.head.ref }}" >> $GITHUB_ENV
+        else
+          echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        fi
     - name: Filter the branch name to generate a tag for Docker
       id: tag
       run: |
@@ -138,7 +149,11 @@ jobs:
       id: branch
       working-directory: Docker
       run: |
-        echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        if [ "${{ github.event_name }}" = "pull_request" ]; then
+          echo "ATS_BRANCH=${{ github.event.pull_request.head.ref }}" >> $GITHUB_ENV
+        else
+          echo "ATS_BRANCH=$GITHUB_REF_NAME" >> $GITHUB_ENV
+        fi
     - name: Filter the branch name to generate a tag for Docker
       id: tag
       run: |
@@ -169,7 +184,11 @@ jobs:
       - name: Filter the branch name to generate a tag for Docker
         id: tag
         run: |
-          echo "ATS_BRANCH_TAG=$(echo $GITHUB_REF_NAME | sed -e 's/\//--/g')" >> $GITHUB_ENV
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            echo "ATS_BRANCH_TAG=$(echo ${{ github.event.pull_request.head.ref }} | sed -e 's/\//--/g')" >> $GITHUB_ENV
+          else
+            echo "ATS_BRANCH_TAG=$GITHUB_REF_NAME | sed -e 's/\//--/g')" >> $GITHUB_ENV
+          fi
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with: