The National Inventory and Monitoring (I&M) Program was established by the National Park Service (NPS) to identify and inventory the biological and geophysical resources of each park. It also establishes monitoring programs to quantify and understand the causes of changes in the condition of park resources. To ensure that monitoring is done effectively and consistently, the NPS requires the establishment of a set of monitoring protocols. This report describes protocols for monitoring groundwater resources in these parks. This protocol may be useful in other parks if hydrogeologic conditions, natural resources, and monitoring objectives are similar to those described here.