diff --git a/.github/common/fortran-format-check.sh b/.github/common/fortran-format-check.sh
new file mode 100755
index 00000000000..d542e004662
--- /dev/null
+++ b/.github/common/fortran-format-check.sh
@@ -0,0 +1,48 @@
+#! /bin/bash
+
+#SEARCHPATHS=(src srcbmi utils)
+SEARCHPATHS=(src)
+EXCLUDEDIRS=(src/Utilities/Libraries/blas # external library blas
+             src/Utilities/Libraries/daglib # external library dag
+             src/Utilities/Libraries/rcm # external library rcm
+             src/Utilities/Libraries/sparsekit # external library sparsekit
+             src/Utilities/Libraries/sparskit2) # external library sparsekit2
+EXCLUDEFILES=(src/Utilities/InputOutput.f90) # excluded until refactored 
+
+fformatfails=()
+checkcount=0
+
+for path in "${SEARCHPATHS[@]}"; do
+  readarray -d '' files < <(find "${path}" -type f -print0 | grep -z '\.[fF]9[0,5]$')
+  for file in "${files[@]}"; do
+    exclude=0
+
+    for d in "${EXCLUDEDIRS[@]}"; do
+      [[ "${d}" == $(dirname "${file}") ]] && exclude=1 && break; done
+    if [[ ${exclude} == 1 ]]; then continue; fi
+
+    for f in "${EXCLUDEFILES[@]}"; do
+      [[ "${f}" == "${file}" ]] && exclude=1 && break; done
+    if [[ ${exclude} == 1 ]]; then continue; fi
+
+    ((checkcount++))
+
+    if [[ ! -z $(fprettify -d -c ./distribution/.fprettify.yaml "${file}" 2>&1) ]]; then
+      fformatfails+=("${file}")
+    fi
+  done
+done
+
+echo -e "\nFortran source files checked: ${checkcount}"
+echo -e "Fortran source files failed: ${#fformatfails[@]}\n"
+
+if [[ ${#fformatfails[@]} > 0 ]]; then
+  for f in "${fformatfails[@]}"; do echo "${f}"; done
+
+  echo -e "\nTo verify file format diff and/or warn in local environment run:"
+  echo -e " 'fprettify -d -c <path to modflow6>/distribution/.fprettify.yaml <filepath>'\n\n"
+
+  exit 1
+fi
+
+exit 0
diff --git a/.github/common/install-python-std.sh b/.github/common/install-python-std.sh
index 7cbbdb543ad..d28afc2309a 100755
--- a/.github/common/install-python-std.sh
+++ b/.github/common/install-python-std.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 pip install wheel
-pip install requests appdirs numpy matplotlib pytest pytest-xdist meson!=0.63.0 ninja
+pip install requests appdirs numpy matplotlib pytest pytest-xdist meson!=0.63.0 ninja fprettify
 pip install https://github.com/modflowpy/flopy/zipball/develop
 pip install https://github.com/modflowpy/pymake/zipball/master
 pip install https://github.com/Deltares/xmipy/zipball/develop
diff --git a/.github/workflows/ci-format.yml b/.github/workflows/ci-format.yml
new file mode 100644
index 00000000000..a959e79ef0d
--- /dev/null
+++ b/.github/workflows/ci-format.yml
@@ -0,0 +1,41 @@
+name: docs
+
+on:
+  push:
+    branches: [ master, develop ]
+  pull_request:
+    branches: [ develop ]
+
+jobs:
+  fortan-format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2.3.4
+
+      - name: Setup Python
+        uses: actions/setup-python@v4.0.0
+        with:
+          python-version: 3.9
+
+      - name: Install python packages
+        run: |
+          .github/common/install-python-std.sh
+
+      - name: Setup symbolic links on Linux
+        run: |
+          sudo ln -fs /usr/bin/gfortran-10 /usr/local/bin/gfortran
+          sudo ln -fs /usr/bin/gcc-10 /usr/local/bin/gcc
+          sudo ln -fs /usr/bin/g++-10 /usr/local/bin/g++
+
+      - name: Print python package versions
+        run: |
+          pip list
+
+      - name: Set and print branch name
+        run: |
+          .github/common/git-branch-export.sh
+
+      - name: Fortran source format check
+        run: |
+          .github/common/fortran-format-check.sh