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Michigan State University: Water sampling to meet federal on-farm food safety guidelines can be confusing. This article helps eliminate some confusion about taking and submitting a water sample[…] Even if a lab conducts a water test you are looking to have done, it doesn’t mean they test every day of the week. Call ahead to the lab and ask questions well in advance of taking samples, like, “Do you process generic E. coli samples every day or on certain days?”

Read the full article at the Michigan State University Extension website