Water Treatment Plant is the 5th area in Resident Evil 9: Requiem. This 100% walkthrough includes all Collectibles, Trophies and Key Items.
For other Areas see Resident Evil Requiem Walkthrough.
Water Treatment Plant (Rhodes Hill) – Grace
Get to the Surface
File #47 – Roof Hatch Manual
Storage Bay: When playing as Grace again, go forward until you lay down Emily and reach a safe room with a typewriter. The file is next to the typewriter.
Trophy: Bring Out the Big Guns
While in the safe room be sure to equip the Requiem revolver (if you stored it in the box, transfer it to your inventory). Pick up the 12.7x55mm ammo from the typewriter table, and take any you stored in the box. In the next section after you go downstairs, you get chased by the big monster (“The Girl”) again. Shoot her once with the Requiem to unlock the trophy. Could also be done earlier but here is the spot where you are meant to shoot her to stun her while you turn on the power.
This next section you need to activate the three power switches on the lower level, which will allow you to activate the power on the upper floor. You are stalked by The Girl in this area so need to make use of the available lights and any Requiem ammo you have to avoid her.
Restart the Power Distribution Units
To start exit the save room, then interact with the green lift button to prompt going to the lower floor. Drop down two levels and make sure to pick up the 12.7x55mm ammo pick immediately after the second drop. Keep walking forward and you’ll encounter a three way split path where The Girl will appear in front of you. Back up toward where you dropped down, then when she moves to the left move to the path leading to the right. Keep rotating right and The Girl should have started chasing you, but you will encounter a light in the corner. You can activate these lights to temporarily stun The Girl, but after they are used they will burn out and can’t be used again so make sure you time them correctly.
Once she is stunned quickly run forward and interact with the crank by the red light. This is the first of the three switches and will turn on the light in this area, causing The Girl to run away.
Walk back to the split in the path and follow the next path to the right, the girl won’t reappear yet so you can quickly run through the room with the red light to the room at the back.
Key Item: Crank Lever
Filing Room: Found on shelf in Filing Room, use in Control Room to turn on power.
Turn back to the Control Room and interact with the console and place the Crank Lever. When you try to use it The Girl will likely appear and throw Grace against the window away from the console. This is a good spot to shoot The Girl with the Requiem and earn Bring Out the Big Guns. Shooting her will stun her long enough you can run back around to the console and activate it. Note on Insanity you will have to shoot twice to stun, but on lower difficulties she is stunned with one shot.
After activating the switch go back to the split and slowly move toward the last path. The Girl should be walking around the central area, so wait for her to move to the left out of the way before continuing toward the red light where the console is. As you go by a grate will drop from the ceiling, note the spot because that is where The Girl will drop from. You want to have a molotov equipped (there is one on the right if you don’t have one) and be ready to throw it. When you interact with this switch it will be stuck and you need to hold 
to turn it, but as soon as you touch it The Girl will drop down so don’t hold the button. Throw the molotov at her where she dropped (where the grate fell) which will stun her for long enough to turn the switch.
After the final switch is activated, you can return to the spot where you dropped down and use the elevator to get back to the top floor. Quickly run back over and press the green switch to start the hatch opening, then shoot The Girl with the Requiem if you have ammo for it left, or with your normal gun.
After the scene go back to the door where you left Emily. After another scene, you will be playing as Leon and need to shoot the enemy in front of you until the next cutscene starts.
NEXT: Raccoon City – East Raccoon City
For all areas refer to Resident Evil Requiem Walkthrough.
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