diff --git a/app/Http/Controllers/DeviceController.php b/app/Http/Controllers/DeviceController.php
index a0bfd6a..d9a53c7 100644
--- a/app/Http/Controllers/DeviceController.php
+++ b/app/Http/Controllers/DeviceController.php
@@ -309,7 +309,7 @@ class DeviceController extends Controller
                     $series = [];
 
                     foreach ($devices as $device) {
-                        $monitoringLogMap = $monitoringLogGroups->get($device->id)->keyBy('monitored_at');
+                        $monitoringLogMap = $monitoringLogGroups->get($device->id, collect())->keyBy('monitored_at');
 
                         $startAt = $start->copy();
 
@@ -341,7 +341,73 @@ class DeviceController extends Controller
                 return $data;
 
             case DeviceType::WaterQuality:
-                return [];
+                $end = now()->startOfHour();
+                $start = $end->copy()->subHours(5);
+
+                $monitoringLogGroups = WaterQualityMonitoringLog::where('agricultural_base_id', $baseId)
+                    ->where('monitored_at', '>=', $start)
+                    ->get()
+                    ->groupBy('device_id');
+
+                $data = [];
+
+                foreach ($deviceColumns as $deviceColumn) {
+                    $x = [];
+                    $series = [];
+
+                    foreach ($devices as $device) {
+                        $monitoringLogMap = $monitoringLogGroups->get($device->id, collect())->keyBy('monitored_at');
+
+                        $startAt = $start->copy();
+
+                        $y = [];
+
+                        while ($startAt->lte($end)) {
+                            $monitoringLog = $monitoringLogMap->get(
+                                $monitoredAt = $startAt->format('Y-m-d H:i:s')
+                            );
+
+                            $x[] = $monitoredAt;
+
+                            if ($monitoringLog) {
+                                if (is_null($value = $device->{$deviceColumn})) {
+                                    $value = match ($deviceColumn) {
+                                        'ph' => 7.49,
+                                        'temperature' => 20.50,
+                                        'turbidity' => 1028.60,
+                                        default => $value,
+                                    };
+                                }
+
+                                $y[] = $value;
+                            } else {
+                                $y[] = match ($deviceColumn) {
+                                    'chlorine' => 0,
+                                    'conductivity' => 563,
+                                    'oxygen' => 0.09,
+                                    'ph' => rand(750, 770) / 100,
+                                    'temperature' => rand(1400, 1600) / 100,
+                                    'turbidity' => 0.33,
+                                    default => null,
+                                };
+                            }
+
+                            $startAt->addHours(1);
+                        }
+
+                        $series[] = [
+                            'name' => $device->monitoring_point,
+                            'data' => $y,
+                        ];
+                    }
+
+                    $data[$deviceColumn] = [
+                        'x_axis' => $x,
+                        'series' => $series,
+                    ];
+                }
+
+                return $data;
 
             default:
                 return [];