Verified for the August 2026 patch · updated Aug 20, 2026
Water Treatment Plant
Blast doors, a timer sprint between two buildings, and six crates plus a red keycard at the end.
At a glance
- Puzzle
- Blue keycard
- Cards needed
- Fuses
- 1
- Rad protection
- 25 rad protection
- Recycler
- Yes, on-site
- Puzzle reward
- Red keycard + 6 crates
Water Treatment is the timed sprint of the blue tier: the fuse and timer live in one building, the blue door in another, and the clock decides whether you loot or reset.
Why you’re here
A red keycard and six crates for a blue card and one fuse — no green card leg. Water Treatment’s basin field is also one of the denser barrel farms in the game, so the run pays even before the puzzle does.
The layout
Treatment basins and pipeworks surround a cluster of industrial buildings. The circuit starts in the center building behind the blast doors (fuse + timer upstairs), then crosses to a second building where the blue reader waits on the second floor. Roughly 25 rad protection keeps the route comfortable.
Route and circuit: Water Treatment puzzle guide.
Loot worth the trip
- Red keycard in the blue puzzle room
- 6 crates (wood/military) behind the blue door
- Dense barrel/crate scatter through the treatment basins