diff --git a/bundles/org.openhab.binding.hydrawise/src/main/java/org/openhab/binding/hydrawise/internal/handler/HydrawiseControllerHandler.java b/bundles/org.openhab.binding.hydrawise/src/main/java/org/openhab/binding/hydrawise/internal/handler/HydrawiseControllerHandler.java
index 3b24fc5818f99..087b939ba7d18 100644
--- a/bundles/org.openhab.binding.hydrawise/src/main/java/org/openhab/binding/hydrawise/internal/handler/HydrawiseControllerHandler.java
+++ b/bundles/org.openhab.binding.hydrawise/src/main/java/org/openhab/binding/hydrawise/internal/handler/HydrawiseControllerHandler.java
@@ -274,9 +274,15 @@ private void updateController(Controller controller) {
     private void updateZones(List<Zone> zones) {
         AtomicReference<Boolean> anyRunning = new AtomicReference<Boolean>(false);
         AtomicReference<Boolean> anySuspended = new AtomicReference<Boolean>(false);
-        int i = 1;
         for (Zone zone : zones) {
-            String group = "zone" + (i++);
+            // there are 12 relays per expander, expanders will have a zoneNumber like:
+            // 10 for expander 0, relay 10 = zone10
+            // 101 for expander 1, relay 1 = zone13
+            // 212 for expander 2, relay 12 = zone36
+            // division of integers in Java give whole numbers, not remainders FYI
+            int zoneNumber = ((zone.number.value / 100) * 12) + (zone.number.value % 100);
+
+            String group = "zone" + zoneNumber;
             zoneMaps.put(group, zone);
             logger.trace("Updateing Zone {} {} ", group, zone.name);
             updateGroupState(group, CHANNEL_ZONE_NAME, new StringType(zone.name));