diff --git a/api/agent/uniter/uniter.go b/api/agent/uniter/uniter.go
index 7fed50ef7de0..adb262357c6c 100644
--- a/api/agent/uniter/uniter.go
+++ b/api/agent/uniter/uniter.go
@@ -434,35 +434,6 @@ func (st *State) OpenedPortRangesByEndpoint() (map[names.UnitTag]network.Grouped
 	return processOpenPortRangesByEndpointResults(results, st.unitTag)
 }
 
-// OpenedApplicationPortRangesByEndpoint returns all port ranges currently open for the given
-// application, grouped by application endpoint.
-func (st *State) OpenedApplicationPortRangesByEndpoint(appTag names.ApplicationTag) (network.GroupedPortRanges, error) {
-	if st.BestAPIVersion() < 18 {
-		// OpenedApplicationPortRangesByEndpoint() was introduced in UniterAPIV18.
-		return nil, errors.NotImplementedf("OpenedApplicationPortRangesByEndpoint() (need V18+)")
-	}
-	arg := params.Entity{Tag: appTag.String()}
-	var result params.ApplicationOpenedPortsResults
-	if err := st.facade.FacadeCall("OpenedApplicationPortRangesByEndpoint", arg, &result); err != nil {
-		return nil, errors.Trace(err)
-	}
-	if len(result.Results) != 1 {
-		return nil, errors.Errorf("expected 1 result, got %d", len(result.Results))
-	}
-	res := result.Results[0]
-	if res.Error != nil {
-		err := apiservererrors.RestoreError(res.Error)
-		return nil, errors.Annotatef(err, "unable to fetch opened ports for %s", appTag)
-	}
-	out := make(network.GroupedPortRanges)
-	for _, pgs := range res.ApplicationPortRanges {
-		for _, pg := range pgs.PortRanges {
-			out[pgs.Endpoint] = append(out[pgs.Endpoint], pg.NetworkPortRange())
-		}
-	}
-	return out, nil
-}
-
 // WatchRelationUnits returns a watcher that notifies of changes to the
 // counterpart units in the relation for the given unit.
 func (st *State) WatchRelationUnits(
diff --git a/api/agent/uniter/uniter_test.go b/api/agent/uniter/uniter_test.go
index 10197c3b38fd..b34986054d74 100644
--- a/api/agent/uniter/uniter_test.go
+++ b/api/agent/uniter/uniter_test.go
@@ -135,55 +135,6 @@ func (s *uniterSuite) TestOpenedPortRangesByEndpoint(c *gc.C) {
 	})
 }
 
-func (s *uniterSuite) TestOpenedApplicationPortRangesByEndpoint(c *gc.C) {
-	apiCaller := testing.APICallerFunc(func(objType string, version int, id, request string, arg, result interface{}) error {
-		c.Assert(objType, gc.Equals, "Uniter")
-		c.Assert(request, gc.Equals, "OpenedApplicationPortRangesByEndpoint")
-		c.Assert(arg, gc.DeepEquals, params.Entity{Tag: "application-gitlab"})
-		c.Assert(result, gc.FitsTypeOf, &params.ApplicationOpenedPortsResults{})
-		*(result.(*params.ApplicationOpenedPortsResults)) = params.ApplicationOpenedPortsResults{
-			Results: []params.ApplicationOpenedPortsResult{
-				{
-					ApplicationPortRanges: []params.ApplicationOpenedPorts{
-						{
-							Endpoint:   "",
-							PortRanges: []params.PortRange{{100, 200, "tcp"}},
-						},
-						{
-							Endpoint:   "server",
-							PortRanges: []params.PortRange{{3306, 3306, "tcp"}},
-						},
-					},
-				},
-			},
-		}
-		return nil
-	})
-	caller := testing.BestVersionCaller{apiCaller, 18}
-	client := uniter.NewState(caller, names.NewUnitTag("gitlab/0"))
-
-	result, err := client.OpenedApplicationPortRangesByEndpoint(names.NewApplicationTag("gitlab"))
-	c.Assert(err, jc.ErrorIsNil)
-	c.Assert(result, jc.DeepEquals, network.GroupedPortRanges{
-		"":       []network.PortRange{network.MustParsePortRange("100-200/tcp")},
-		"server": []network.PortRange{network.MustParsePortRange("3306/tcp")},
-	})
-}
-
-func (s *uniterSuite) TestOpenedApplicationPortRangesByEndpointOldAPINotSupported(c *gc.C) {
-	apiCaller := testing.APICallerFunc(func(objType string, version int, id, request string, arg, result interface{}) error {
-		c.Assert(objType, gc.Equals, "Uniter")
-		c.Assert(request, gc.Equals, "OpenedApplicationPortRangesByEndpoint")
-		c.Assert(arg, gc.DeepEquals, params.Entities{Entities: []params.Entity{{Tag: "unit-gitlab-0"}}})
-		return nil
-	})
-	caller := testing.BestVersionCaller{apiCaller, 17}
-	client := uniter.NewState(caller, names.NewUnitTag("gitlab/0"))
-
-	_, err := client.OpenedApplicationPortRangesByEndpoint(names.NewApplicationTag("gitlab"))
-	c.Assert(err, gc.ErrorMatches, `OpenedApplicationPortRangesByEndpoint\(\) \(need V18\+\) not implemented`)
-}
-
 func (s *uniterSuite) TestOpenedPortRangesByEndpointOldAPINotSupported(c *gc.C) {
 	apiCaller := testing.APICallerFunc(func(objType string, version int, id, request string, arg, result interface{}) error {
 		c.Assert(objType, gc.Equals, "Uniter")
diff --git a/api/facadeversions.go b/api/facadeversions.go
index 102a09c4689a..35cc5422f978 100644
--- a/api/facadeversions.go
+++ b/api/facadeversions.go
@@ -125,7 +125,7 @@ var facadeVersions = map[string][]int{
 	"Subnets":                      {5},
 	"Undertaker":                   {1},
 	"UnitAssigner":                 {1},
-	"Uniter":                       {18, 19},
+	"Uniter":                       {19},
 	"Upgrader":                     {1},
 	"UpgradeSeries":                {3},
 	"UpgradeSteps":                 {2},