The lead leaching is primarily from household pipes.<p>The awful color of the Flint water that gets shown is from iron that has leached out of the mains.<p>The reason switching back to Detroit water doesn&#x27;t solve anything is because the chemical scale that normally keeps much plumbing material from leaching into the water was disrupted by the improperly treated river water (they could have adjusted the PH during treatment) and has not yet reformed. The Detroit water supply is not itself full of lead or whatever.