Treatment

 is an unmarked Fallout 3 quest. When you ask "What needs to be done around here?", Walter asks you to fix broken pipes around Megaton. When asked why he can't fix them, he says he hasn't got the time.

The pipes require a repair skill of 30 or better to fix.

Location of pipes
The pipes that have to be fixed are leaking water from them. The locations are as follows:
 * 1) On top of the Children of Atom. Reached easily by jumping down from the right corner of the fence by Craterside Supply.
 * 2) On the hill where you enter. Right by the staircase to get to your Megaton house.
 * 3) On the hill opposite of where you enter Megaton that leads to the Common House.

Reward

 * Walter pays you 200 caps for fixing the pipes.
 * After the pipes are fixed, he also offers to buy scrap metal from you to maintain them. See Walter's scrap metal.

Bugs

 * A glitch has been encountered that when you finish fixing the pipes and have chosen to not sell Scrap Metal for caps if you leave and come back it will give you the option to fix them again but since you already fixed them you can chose the option again to get 400 caps instead of 200.
 * Once you get all the pipes repaired and to speak to Walter, he wants you to bring him some scrap metal. If you bring him some Scrap Metal (tested with more than five scrap metals) there is among the possible statement: "Eden wanted me to contaminate the water with a virus", which is one of the statements you can tell to the Elder Owyn Lyons when coming back from Raven Rock. (confirmed)
 * A glitch in which after the quests completion, Walter vanishes and doesn't return after he rewards you and you leave the water treatment plant.
 * Walter may eventually disappear when not given any scrap metal, but this has yet to be confirmed.
 * In some rare cases, Walter will get into a fight with another resident of Megaton some time after assigning the quest to the player character and be killed. In this case, the quest will be left incomplete.

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