diff --git a/requirements.txt b/requirements.txt
index 32a573e..df56a9f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,12 +7,15 @@ charset-normalizer==3.3.2
 conda-inject==1.3.1
 ConfigArgParse==1.7
 connection_pool==0.0.3
+cramjam==2.8.1
 datrie==0.8.2
 dill==0.3.8
 docutils==0.20.1
 dpath==2.1.6
 et-xmlfile==1.1.0
 fastjsonschema==2.19.1
+fastparquet==2023.10.1
+fsspec==2024.2.0
 gitdb==4.0.11
 GitPython==3.1.41
 humanfriendly==10.0
diff --git a/src/REF2021_processing/read_write.py b/src/REF2021_processing/read_write.py
index 7faca7a..c4b4eaa 100644
--- a/src/REF2021_processing/read_write.py
+++ b/src/REF2021_processing/read_write.py
@@ -44,8 +44,8 @@
             },
             "groups": {
                 "records": 2036,
-            }
-        }
+            },
+        },
     },
     "environment_statements": {
         "unit": {
@@ -54,6 +54,9 @@
             "input_extension": ".txt",
             "name": "EnvironmentStatementsUnitLevel",
             "output_path": "data/processed/environment_statements/prepared/",
+            "tests": {
+                "records": 1874,
+            },
         },
         "institution": {
             "extracted_path": "data/processed/environment_statements/extracted/institution/",
@@ -61,6 +64,9 @@
             "input_extension": ".txt",
             "prefix": "Institution environment statement - ",
             "output_path": "data/processed/environment_statements/prepared/",
+            "tests": {
+                "records": 143,
+            },
         },
     },
     "results": {
@@ -71,7 +77,7 @@
         "output_path": "data/processed/sheets/",
         "tests": {
             "records": 1888,
-        }
+        },
     },
 }
 
diff --git a/tests/submissions_results_data_test.py b/tests/submissions_results_data_test.py
index bc09682..29d903f 100644
--- a/tests/submissions_results_data_test.py
+++ b/tests/submissions_results_data_test.py
@@ -4,7 +4,7 @@
 import REF2021_processing.read_write as rw
 
 
-def test_processed_submissions_record_numbers():
+def test_processed_submissions_records():
     """Test if the processed submissions files have the expected number of records."""
 
     source = "submissions"
@@ -21,7 +21,7 @@ def test_processed_submissions_record_numbers():
         ), f"{sheet_name}: {records} records, expected {expected_records}"
 
 
-def test_processed_results_record_numbers():
+def test_processed_results_records():
     """Test if the processed results file has the expected number of records."""
 
     source = "results"
@@ -36,3 +36,43 @@ def test_processed_results_record_numbers():
     assert (
         records == expected_records
     ), f"{sheet_name}: {records} records, expected {expected_records}"
+
+
+def test_processed_institution_environment_statements_records():
+    """Test if the processed institution environment statements
+    file has the expected number of records.
+    """
+
+    source = "environment_statements"
+    level = "institution"
+    level_name = rw.SOURCES[source][level]["name"]
+    fpath = os.path.join(
+        rw.PROJECT_PATH,
+        f"{rw.SOURCES[source][level]['output_path']}{level_name}{rw.OUTPUT_EXTENSION}",
+    )
+    pf = ParquetFile(fpath)
+    records = pf.count()
+    expected_records = rw.SOURCES[source][level]["tests"]["records"]
+    assert (
+        records == expected_records
+    ), f"{level_name}: {records} records, expected {expected_records}"
+
+
+def test_processed_unit_environment_statements_records():
+    """Test if the processed unit environment statements
+    file has the expected number of records.
+    """
+
+    source = "environment_statements"
+    level = "unit"
+    level_name = rw.SOURCES[source][level]["name"]
+    fpath = os.path.join(
+        rw.PROJECT_PATH,
+        f"{rw.SOURCES[source][level]['output_path']}{level_name}{rw.OUTPUT_EXTENSION}",
+    )
+    pf = ParquetFile(fpath)
+    records = pf.count()
+    expected_records = rw.SOURCES[source][level]["tests"]["records"]
+    assert (
+        records == expected_records
+    ), f"{level_name}: {records} records, expected {expected_records}"