diff --git a/homeassistant/components/vistapool/config_flow.py b/homeassistant/components/vistapool/config_flow.py
index 15f6346c53c224..760a115bc5c1fb 100644
--- a/homeassistant/components/vistapool/config_flow.py
+++ b/homeassistant/components/vistapool/config_flow.py
@@ -22,6 +22,8 @@
     }
 )
 
+RECONFIGURE_SCHEMA = vol.Schema({vol.Required(CONF_PASSWORD): cv.string})
+
 
 class VistapoolConfigFlow(ConfigFlow, domain=DOMAIN):
     """Vistapool config flow (one entry per Hayward account)."""
@@ -74,3 +76,38 @@ async def async_step_user(
         return self.async_show_form(
             step_id="user", data_schema=AUTH_SCHEMA, errors=errors
         )
+
+    async def async_step_reconfigure(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Let the user proactively update the stored Vistapool password."""
+        errors: dict[str, str] = {}
+        entry = self._get_reconfigure_entry()
+        username = entry.data[CONF_USERNAME]
+
+        if user_input is not None:
+            password = user_input[CONF_PASSWORD]
+            session = async_get_clientsession(self.hass)
+            auth = AquariteAuth(session, username, password)
+            try:
+                await auth.authenticate()
+            except AuthenticationError:
+                errors["base"] = "invalid_auth"
+            except AquariteError:
+                errors["base"] = "cannot_connect"
+            except Exception:
+                _LOGGER.exception("Unexpected error during reconfiguration")
+                errors["base"] = "unknown"
+            else:
+                await self.async_set_unique_id(auth.user_id)
+                self._abort_if_unique_id_mismatch(reason="account_mismatch")
+                return self.async_update_reload_and_abort(
+                    entry, data_updates={CONF_PASSWORD: password}
+                )
+
+        return self.async_show_form(
+            step_id="reconfigure",
+            data_schema=RECONFIGURE_SCHEMA,
+            description_placeholders={"username": username},
+            errors=errors,
+        )
diff --git a/homeassistant/components/vistapool/quality_scale.yaml b/homeassistant/components/vistapool/quality_scale.yaml
index f325ac8b1422b3..6703dbabc52208 100644
--- a/homeassistant/components/vistapool/quality_scale.yaml
+++ b/homeassistant/components/vistapool/quality_scale.yaml
@@ -53,7 +53,7 @@ rules:
   entity-translations: done
   exception-translations: done
   icon-translations: done
-  reconfiguration-flow: todo
+  reconfiguration-flow: done
   repair-issues:
     status: exempt
     comment: No known repair scenarios
diff --git a/homeassistant/components/vistapool/strings.json b/homeassistant/components/vistapool/strings.json
index 229b0e3216511f..9526f426af1ccc 100644
--- a/homeassistant/components/vistapool/strings.json
+++ b/homeassistant/components/vistapool/strings.json
@@ -1,8 +1,10 @@
 {
   "config": {
     "abort": {
+      "account_mismatch": "The credentials entered are for a different Vistapool account than the one being reconfigured.",
       "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
-      "already_in_progress": "[%key:common::config_flow::abort::already_in_progress%]"
+      "already_in_progress": "[%key:common::config_flow::abort::already_in_progress%]",
+      "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
     },
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
@@ -12,6 +14,16 @@
     },
     "flow_title": "Vistapool pool controller",
     "step": {
+      "reconfigure": {
+        "data": {
+          "password": "[%key:common::config_flow::data::password%]"
+        },
+        "data_description": {
+          "password": "The new password for your Vistapool account."
+        },
+        "description": "Update the stored password for {username}.",
+        "title": "Reconfigure Vistapool"
+      },
       "user": {
         "data": {
           "password": "Password",
diff --git a/tests/components/vistapool/test_config_flow.py b/tests/components/vistapool/test_config_flow.py
index 921207e707467e..2057fd4490fe63 100644
--- a/tests/components/vistapool/test_config_flow.py
+++ b/tests/components/vistapool/test_config_flow.py
@@ -303,3 +303,80 @@ async def test_dhcp_discovery_aborts_when_in_progress(
 
     assert second["type"] is FlowResultType.ABORT
     assert second["reason"] == "already_in_progress"
+
+
+_NEW_PASSWORD = "new-password"
+
+
+async def test_reconfigure_flow(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_setup_entry: AsyncMock,
+    mock_vistapool_client: AsyncMock,
+) -> None:
+    """Test the reconfigure flow updates the stored password and reloads the entry."""
+    mock_config_entry.add_to_hass(hass)
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "reconfigure"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {CONF_PASSWORD: _NEW_PASSWORD}
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.data[CONF_PASSWORD] == _NEW_PASSWORD
+    assert mock_setup_entry.call_count == 1
+
+
+async def test_reconfigure_invalid_auth(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_setup_entry: AsyncMock,
+    mock_vistapool_client: AsyncMock,
+    mock_vistapool_auth: MagicMock,
+) -> None:
+    """Test the reconfigure flow surfaces invalid_auth and recovers on retry."""
+    mock_config_entry.add_to_hass(hass)
+    mock_vistapool_auth.authenticate.side_effect = AuthenticationError
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {CONF_PASSWORD: _NEW_PASSWORD}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["errors"] == {"base": "invalid_auth"}
+
+    mock_vistapool_auth.authenticate.side_effect = None
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {CONF_PASSWORD: _NEW_PASSWORD}
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "reconfigure_successful"
+    assert mock_config_entry.data[CONF_PASSWORD] == _NEW_PASSWORD
+    assert mock_setup_entry.call_count == 1
+
+
+async def test_reconfigure_account_mismatch(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_setup_entry: AsyncMock,
+    mock_vistapool_client: AsyncMock,
+    mock_vistapool_auth: MagicMock,
+) -> None:
+    """Test the reconfigure flow aborts when credentials belong to a different account."""
+    mock_config_entry.add_to_hass(hass)
+    mock_vistapool_auth.user_id = "a-different-firebase-uid"
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {CONF_PASSWORD: _NEW_PASSWORD}
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "account_mismatch"
+    assert mock_setup_entry.call_count == 0