From the moment the Pavillion water samples were bottled by testers with the U.S. Environmental Protection Agency, the clock began to tick.

The testers zipped the bottles tightly in clear plastic bags, surrounded them with ice in two small coolers, and shipped them overnight to the agency’s laboratory in Golden, Colo., for analysis.

There, the samples waited as the deadline neared for them to be accurately tested. By the time the samples were tested, the EPA-mandated hold times had come and gone.

“Maintenance of the laboratory floor” caused the hold, according to the EPA’s lab data report on the April 2011 samples.