diff --git a/__pycache__/ingest_eia_energy_layers.cpython-314.pyc b/__pycache__/ingest_eia_energy_layers.cpython-314.pyc
index abd9810..0756fad 100644
Binary files a/__pycache__/ingest_eia_energy_layers.cpython-314.pyc and b/__pycache__/ingest_eia_energy_layers.cpython-314.pyc differ
diff --git a/ingest_eia_energy_layers.py b/ingest_eia_energy_layers.py
index 81ef532..c82a6f0 100644
--- a/ingest_eia_energy_layers.py
+++ b/ingest_eia_energy_layers.py
@@ -29,6 +29,7 @@ from typing import List, Optional, Dict, Any
 
 import psycopg2
 import requests
+from psycopg2 import sql
 
 
 DB_NAME = "data_centers"
@@ -651,6 +652,72 @@ def build_summary_table(conn):
             cur.execute(f"analyze {SUMMARY_TABLE}")
 
 
+def prune_stale_layer_versions(conn) -> int:
+    """Drop superseded EIA layer tables and remove stale catalog rows.
+
+    Superseded versions are identified by a normalized source key
+    (source_url without trailing /data). The newest entry is kept.
+    """
+    with conn.cursor() as cur:
+        cur.execute(
+            """
+            with ranked as (
+                select
+                    c.table_name,
+                    row_number() over (
+                        partition by coalesce(
+                            nullif(regexp_replace(c.source_url, '/data/?$', ''), ''),
+                            nullif(c.source_item_id, ''),
+                            c.table_name
+                        )
+                        order by c.imported_at desc, c.table_name desc
+                    ) as rn
+                from public.energy_atlas_layers_catalog c
+            )
+            select r.table_name
+            from ranked r
+            where r.rn > 1
+            """
+        )
+        stale_tables = [row[0] for row in cur.fetchall()]
+
+    pruned = 0
+    with conn:
+        with conn.cursor() as cur:
+            for table_name in stale_tables:
+                # Guardrail: only manage script-owned EIA tables.
+                if not table_name.startswith("energy_eia_"):
+                    continue
+
+                cur.execute(
+                    """
+                    select exists (
+                        select 1
+                        from information_schema.tables
+                        where table_schema='public' and table_name=%s
+                    )
+                    """,
+                    (table_name,),
+                )
+                table_exists = cur.fetchone()[0]
+
+                if table_exists:
+                    cur.execute(
+                        sql.SQL("drop table if exists public.{} cascade").format(
+                            sql.Identifier(table_name)
+                        )
+                    )
+                    print(f"pruned stale table public.{table_name}")
+
+                cur.execute(
+                    "delete from public.energy_atlas_layers_catalog where table_name = %s",
+                    (table_name,),
+                )
+                pruned += 1
+
+    return pruned
+
+
 def parse_args():
     """Parse command-line arguments."""
     parser = argparse.ArgumentParser(
@@ -680,6 +747,11 @@ def parse_args():
         action="store_true",
         help="List selected datasets and exit.",
     )
+    parser.add_argument(
+        "--keep-stale-tables",
+        action="store_true",
+        help="Do not prune superseded EIA tables/catalog entries.",
+    )
     return parser.parse_args()
 
 
@@ -730,13 +802,36 @@ def main():
                 except Exception as e:
                     print(f"  warning: import failed ({type(e).__name__}); skipping")
                     continue
+
+        if not args.keep_stale_tables:
+            pruned = prune_stale_layer_versions(conn)
+            if pruned > 0:
+                print(f"pruned stale layer versions: {pruned}")
         
         # Rebuild GEOID links from catalog.
         with conn.cursor() as cur:
             cur.execute(
                 """
+                with ranked as (
+                    select
+                        c.table_name,
+                        c.category,
+                        row_number() over (
+                            partition by coalesce(
+                                nullif(regexp_replace(c.source_url, '/data/?$', ''), ''),
+                                nullif(c.source_item_id, ''),
+                                c.table_name
+                            )
+                            order by c.imported_at desc, c.table_name desc
+                        ) as rn
+                    from public.energy_atlas_layers_catalog c
+                    join information_schema.tables t
+                      on t.table_schema = 'public'
+                     and t.table_name = c.table_name
+                )
                 select table_name, category
-                from public.energy_atlas_layers_catalog
+                from ranked
+                where rn = 1
                 order by table_name
                 """
             )