diff --git a/nixos/doc/manual/release-notes/rl-1909.xml b/nixos/doc/manual/release-notes/rl-1909.xml
index ee3b03581529..db4629443002 100644
--- a/nixos/doc/manual/release-notes/rl-1909.xml
+++ b/nixos/doc/manual/release-notes/rl-1909.xml
@@ -204,6 +204,11 @@
      accordingly.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     PostgreSQL 9.4 is scheduled EOL during the 19.09 life cycle and has been removed.
+    </para>
+   </listitem>
    <listitem>
     <para>
      The options <option>services.prometheus.alertmanager.user</option> and
diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 1ed4d3290ced..7bba4dacddcc 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -228,7 +228,7 @@ in
       # systems!
       mkDefault (if versionAtLeast config.system.stateVersion "17.09" then pkgs.postgresql_9_6
             else if versionAtLeast config.system.stateVersion "16.03" then pkgs.postgresql_9_5
-            else pkgs.postgresql_9_4);
+            else throw "postgresql_9_4 was removed, please upgrade your postgresql version.");
 
     services.postgresql.dataDir =
       mkDefault (if versionAtLeast config.system.stateVersion "17.09" then "/var/lib/postgresql/${config.services.postgresql.package.psqlSchema}"
diff --git a/pkgs/servers/sql/postgresql/default.nix b/pkgs/servers/sql/postgresql/default.nix
index 5dcbe5106d65..0ca6f35ae7ad 100644
--- a/pkgs/servers/sql/postgresql/default.nix
+++ b/pkgs/servers/sql/postgresql/default.nix
@@ -168,14 +168,6 @@ let
 
 in self: {
 
-  postgresql_9_4 = self.callPackage generic {
-    version = "9.4.24";
-    psqlSchema = "9.4";
-    sha256 = "0acl1wmah3r1a0qjjmpc256glccrjnzq4pkwklx4d9s6vmkks9aj";
-    this = self.postgresql_9_4;
-    inherit self;
-  };
-
   postgresql_9_5 = self.callPackage generic {
     version = "9.5.19";
     psqlSchema = "9.5";
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 533d6d948de5..046c6bc9acc3 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -265,7 +265,6 @@ mapAliases ({
   plexpy = tautulli; # plexpy got renamed to tautulli, added 2019-02-22
   pmtools = acpica-tools; # added 2018-11-01
   poppler_qt5 = libsForQt5.poppler;  # added 2015-12-19
-  postgresql94 = postgresql_9_4;
   postgresql95 = postgresql_9_5;
   postgresql96 = postgresql_9_6;
   postgresql100 = throw "deprecated 2018-10-21: use postgresql_10 instead";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f5169eaa7802..793d1485bc14 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14979,8 +14979,6 @@ in
 
   pgbouncer = callPackage ../servers/sql/pgbouncer { };
 
-  pgpool94 = pgpool.override { postgresql = postgresql_9_4; };
-
   pgpool = callPackage ../servers/sql/pgpool {
     pam = if stdenv.isLinux then pam else null;
     libmemcached = null; # Detection is broken upstream
@@ -14991,7 +14989,6 @@ in
   timescaledb-tune = callPackage ../development/tools/database/timescaledb-tune { };
 
   inherit (import ../servers/sql/postgresql pkgs)
-    postgresql_9_4
     postgresql_9_5
     postgresql_9_6
     postgresql_10