Water processing plant

The Water Processing Plant is found in Megaton; to reach it take a right after you enter Megaton, it's directly upstairs from Craterside Supply.

It is the work place of Megaton's plumbing technician Walter from who you can obtain the quest Fix Broken Pipes Around Megaton. After completion you can turn in pieces of Scrap Metal to him in return for Bottle Caps or Good Karma.

It is also the place where Leo Stahl keeps his hidden stash and getting high at nights.

Related Mini-Quests

 * Stahl's addiction
 * Fix Broken Pipes Around Megaton

After I sold a couple times Scrap metal to Walter it disapeared and I never find him again.