Index: trunk/data/validator/unnecessary.mapcss
===================================================================
--- trunk/data/validator/unnecessary.mapcss	(revision 13378)
+++ trunk/data/validator/unnecessary.mapcss	(revision 14593)
@@ -65,2 +65,9 @@
   group: tr("unnecessary tag");
 }
+
+/* #15774 */
+node[emergency=fire_hydrant][fire_hydrant:count=1] {
+  throwWarning: tr("{0} is unnecessary for {1}", "{1.tag}", "{0.tag}");
+  group: tr("unnecessary tag");
+  fixRemove: "{1.key}";
+}