The Groundwater Program is co-managed between the DEP and Swinomish Land Management Department. Project's objectives are to:
- fully describe the groundwater hydrology of the Reservation,
- the interactions between groundwater and surface water, and
- to integrate this information into management tools, including
- a numerical model,
- monitoring plan, and
- resource protection policies and ordinances.
The DEP regularly monitors water levels in a monitoring well netowrk that includes wells in multiple hydrostratigraphic units across the Reservation as well as surface water elevations at Reservation streams, wetlands, and sloughs.