The WellConstruction targetFormation field documents the specific aquifer zone or geological formation the well was designed to monitor — for example "Upper Sand Aquifer" or "Weathered Bedrock Zone". Hydrogeologists use targetFormation when comparing water levels and analytical results across wells completed in different formations, since groundwater in different units may be hydraulically isolated and show different contaminant concentrations. This field is commonly included in site characterization reports to stratify monitoring data by formation.
Technical section
Data model, API, and internals — visible to developers.