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Latest tests on 423 Flint homes show most below lead action

The state of Michigan says water tests at hundreds of Flint homes show 91 percent were below an important benchmark for lead.

The results from so-called sentinel sites will help authorities decide when Flint residents can resume using unfiltered water.

Gov. Rick Snyder says the latest tests occurred at 423 sites. He says 386 were below 15 parts per billion for lead. 

Eight samples exceeded 100 parts per billion.

Home filters distributed to Flint residents are good for up to 150 parts per billion of lead.

Results announced last week from 175 sites showed 89 percent were below the lead action level.

Flint has problems because corrosive water from the Flint River leached lead from old plumbing.

The head of the U.S. Environmental Protection Agency is visiting Flint on Tuesday.

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