WA · Seattle, Tacoma, and the Puget Sound
Hydrogeology expert witness in Seattle, Tacoma, and the Puget Sound
Puget Sound glacial deposits stack till, outwash, and lake sediments into layered aquifers that are hard to map and easy to oversimplify. Add a century of industry along the Duwamish and Commencement Bay, and allocation fights under Washington’s Model Toxics Control Act often turn on which pathway carried what, and when.
At a glance
Wetstone Solutions holds Washington professional geologist licensure and supports hydrogeology expert witness and environmental litigation work across the Puget Sound: Model Toxics Control Act cost recovery and allocation, industrial waterways, smelter legacy soils, and complex glacial aquifers.
Puget Sound matters that need hydrogeology
These are the dispute types that most often need a Washington PG hydrogeologist or expert witness in this region. Named sites are regional context, not a list of Wetstone engagements or claimed outcomes.
MTCA cost recovery and allocation
Washington’s Model Toxics Control Act drives private contribution and cost recovery claims. Allocation depends on reconstructing source history and pathways from groundwater, soil, and chemistry data.
Industrial waterways
The Lower Duwamish Waterway and Commencement Bay are Superfund sites with many potentially responsible parties. Groundwater discharge and upland source questions can decide who pays for sediment cleanup.
Smelter legacy soils
Emissions from the former ASARCO Tacoma smelter deposited arsenic and lead across a wide area of the South Sound. Extent and source disputes need geochemistry and site history.
Layered glacial aquifers
Vashon till, advance outwash, and older glacial units create perched zones and confined aquifers. We test whether the boring logs support the layering and connections a model assumes.
Ecology decisions and the Pollution Control Hearings Board
Department of Ecology permits and orders can be appealed to the Pollution Control Hearings Board. We review the hydrogeologic basis of the decision.
Model and report review
We review opposing models and reports for conceptual errors, calibration problems, and overstatement, and document the critique for the record.
Puget Sound counties we support
Engagements may involve sites or counsel in the Seattle and Tacoma region, including:
- King County
- Pierce County
- Snohomish County
- Kitsap County
- Thurston County
Statewide Washington context: Hydrogeology expert witness in Washington.
Frequently asked questions
- Is Wetstone licensed in Washington?
- Yes. Wetstone maintains Washington professional geologist licensure and supports Puget Sound hydrogeology matters, subject to conflicts, scope, and licensing rules.
- Do you support MTCA allocation disputes?
- Yes. We evaluate source history, pathways, and timing to support allocation and cost recovery positions, and we review the technical basis of the other side’s allocation.
- Why are Puget Sound glacial aquifers hard to interpret?
- Glacial units vary sharply over short distances, so thin sand layers or till windows can control flow. Interpretations need to be tied to the actual boring logs and heads, not a simplified regional layer cake.
- Is Wetstone local to Seattle or Tacoma?
- No. Wetstone is based in Western Pennsylvania. Site visits, depositions, and hearings in the Puget Sound region are scheduled per matter.
Discuss a Seattle, Tacoma, or Puget Sound matter after a conflict check.