diff --git a/.github/workflows/tests.yml b/.github/workflows/tests_macos.yml
similarity index 88%
rename from .github/workflows/tests.yml
rename to .github/workflows/tests_macos.yml
index dbebd83..036fffd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests_macos.yml
@@ -1,4 +1,4 @@
-name: Tests
+name: Tests macOS
 
 on:
   - push
@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-latest]
+        os: [macos-latest]
         python-version: ['3.9', '3.10', '3.11']
       fail-fast: false
     steps:
diff --git a/.github/workflows/tests_main.yml b/.github/workflows/tests_main.yml
new file mode 100644
index 0000000..c2f88bf
--- /dev/null
+++ b/.github/workflows/tests_main.yml
@@ -0,0 +1,26 @@
+name: Tests Windows and Linux
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest]
+        python-version: ['3.9', '3.10', '3.11']
+      fail-fast: false
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+    - name: Test with tox
+      run: tox
\ No newline at end of file
diff --git a/README.md b/README.md
index d40a945..a21be83 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # MF6RTM: Reactive Transport Model via the MODFLOW 6 and PHREEQCRM APIs
-![Tests](https://github.com/p-ortega/mf6rtm/actions/workflows/tests.yml/badge.svg)
+![Tests](https://github.com/p-ortega/mf6rtm/actions/workflows/tests_main.yml/badge.svg)
+![Tests](https://github.com/p-ortega/mf6rtm/actions/workflows/tests_macos.yml/badge.svg)
 
 ## Benchmarks
 Benchmark comparing model results against PHT3d are in `benchmark/`. Each folder contains a Jupyter notebook to write and execute an MF6RTM model via the MUP3D class. Additionally, PHT3D files are provided in the corresponding `pht3d` directory.