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King County, Washington
Environmental Services in King County, WA
Environmental site assessments and construction-phase environmental support that keep transactions and projects moving without surprises. King County is covered on a project basis through our Seattle, WA regional hub.
- Dispatched from
- Seattle, WA regional hub · project-based staffing
- Lead time
- Scheduled by phone or proposal; lead time confirmed when the scope is set
- Laboratory
- Sugar Land, TX laboratory under chain of custody, or a mobile laboratory for large projects
- Reporting
- Reviewed and issued under a documented quality system; formatted for owner, engineer, and building-official review
- Serving
- King County, WA — Seattle, Spokane, Tacoma
- Coverage
- Washington statewide · 27 regional hubs
- Technicians
- ACI- and NICET-certified field staff; licensed professionals in Washington
- Call us
- (346) 420-5425
Scope
Environmental services in King County
- Phase I Environmental Site Assessments for acquisitions and refinancing
- Phase II subsurface sampling when a Phase I identifies recognized environmental conditions
- Construction stormwater support: SWPPP compliance inspections
- Soil management screening for export and import of fill material
Full scope, standards list, and pricing basis: Environmental Services.
Local conditions
Environmental conditions in King County
King County sits at the intersection of significant industrial history, dense urban redevelopment, and environmentally sensitive land — from former mill and rail corridors to shoreline properties governed by the Washington State Environmental Policy Act and the Shoreline Management Act. Brownfield redevelopment, infill construction, and public infrastructure work here routinely require environmental due diligence before a transaction closes or a shovel breaks ground. Our environmental services team, dispatched through the Seattle regional hub, supports contractors, developers, and engineers with Phase I and Phase II Environmental Site Assessments, construction-phase soil management planning, and subsurface investigation scoping. Work is coordinated to align with your project schedule and Washington Department of Ecology requirements. The laboratory operates under a documented quality system, and field personnel carry applicable ACI and NICET certifications. Our role is to surface environmental risk early so projects move forward on schedule and without regulatory surprises.
King County's glacially deposited soils — including dense tills, outwash sands, and localized areas of fill near historic industrial waterfronts — can affect how subsurface investigations are scoped and how soil cuttings are classified for off-haul. The region's high annual rainfall also means that construction-phase erosion and stormwater controls intersect closely with environmental compliance obligations under local permitting.
FAQ · King County
Does Washington SEPA review affect the scope or timing of our environmental site assessment?
Washington's State Environmental Policy Act requires environmental review for many permits and land-use decisions, and it can run concurrently with or influence the scope of ASTM E1527-21 Phase I work. If your project is subject to SEPA, coordinate the ESA timeline with your permit applications early. A completed Phase I can support SEPA documentation, but the two processes have distinct requirements and agency touchpoints.
How does King County's history of industrial waterfront and mill-site use affect Phase II scoping?
Former timber milling, rail, and port-related land uses along King County's waterways are associated with petroleum hydrocarbons, heavy metals, and treated-wood preservatives such as creosote and pentachlorophenol. Phase II scoping near these corridors typically includes soil and groundwater sampling targeted at those analytes. Washington Department of Ecology Model Toxics Control Act cleanup standards govern what constitutes a reportable concentration.
What are the soil management obligations when excavated material from a King County site may be contaminated?
Washington's Model Toxics Control Act and applicable King County requirements govern how potentially contaminated soils are characterized, transported, and disposed of. A soil management plan prepared before excavation begins identifies sampling locations, analytical parameters, and approved disposal or reuse pathways. Establishing this plan during the design phase avoids schedule delays when contaminated material is encountered during construction.
Which office covers environmental in King County, WA?
Field work in King County is dispatched through the Seattle, WA regional hub. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large King County projects.
Are the technicians you send to King County certified?
Field sampling and testing in King County are performed by our ACI- and NICET-certified technicians. Environmental engineering and professional services are delivered with professionals licensed in Washington, coordinated under one proposal.
Scheduling & proposals
Need environmental services in King County?
Call to schedule a technician, or send project documents for a written proposal.