Plan: Water filter

Plan: Water filter is a plan in Fallout 76.

Location

 * Eastern Regional Penitentiary - Inside the intake room near cell block D, on a corner table on the right.
 * Grafton - On a middle wooden crate near the alleyway cooking station.
 * Hemlock Holes - Outside the main building, on a table beneath a collapsed tent.
 * Knife Edge - On a table by the tinker's workbench.
 * Pioneer Scout camp - In the archery range shack.

Unlocks
The plan unlocks crafting of the water filter at a cooking station or chemistry station.