Exceedance Sample Date

The sampleDate on an Exceedance is the collection date of the sample that triggered the violation — copied from the parent SamplingEvent. This date drives regulatory reporting: most permit conditions define compliance periods by calendar quarter or annual reporting period, so grouping exceedances by sampleDate is essential for producing the correct reporting window summaries. The sampleDate also anchors trend charts that show whether exceedances for a specific analyte and well are occurring more or less frequently over time, which is a key metric for demonstrating remedial progress.