"MWRA offered free testing services," Stead said."All we had to invest was our employee's time." Callahantook the samples early in the morning between October and January. Insome cases, lead concentrations decreased significantly after the water was flushed, or run,for 30 seconds between tests.Lead can build up overnight while water is standing still. Atsomeschools in the region, custodians go through school buildings and flush drinking fountains each morning, butStead said he didn't feel that was necessary. The best course of action, he said,was to simply disconnect the fixtures that tested

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