In reports on water testing at schools located in the right column “A” and “B” samples are listed. The “A” sample is the first water sample drawn, which includes water that has been sitting in the fixture. The “B” sample is drawn next and includes water that has been sitting in the pipe leading to the fixture. We analyze the “A” samples for all fixtures; but only analyze the “B” sample on fixtures where the “A” sample results were over the action level. See the reports for your school on the district website at the link above for details on action levels.