Two conditions can trigger an exceedance record in Piper. An Exceeded type means the measured concentration is above the regulatory threshold — a straightforward compliance failure. An ElevatedMDL type means the analytical method detection limit (MDL) is higher than the threshold, so even a non-detect result cannot confirm compliance. Both types appear in exceedance summaries and regulatory reports, but they carry different implications for risk and required response actions.
Technical section
Data model, API, and internals — visible to developers.