ISO 5667-11:2009提供了地下水采样指南。它告知用户在规划和进行地下水采样时的必要注意事项，以调查地下水供应质量，检测和评估地下水污染，并协助地下水资源管理、保护和修复。ISO 5667-11:2009不适用于与饮用水抽取的日常操作控制相关的采样。该指南包括对饱和（地下水位以下）区和非饱和（地下水位以上）区的地下水进行采样。

ISO 5667-11:2009 provides guidance on the sampling of groundwaters. It informs the user of the necessary considerations when planning and undertaking groundwater sampling to survey the quality of groundwater supply, to detect and assess groundwater contamination and to assist in groundwater resource management, protection and remediation. ISO 5667-11:2009 does not apply to sampling related to the day-to-day operational control of groundwater abstractions for potable purposes. The guidance includes sampling of groundwater from both the saturated (below water table) zone and the unsaturated (above the water table) zone.