This property has a documented history as a public works and maintenance facility going back to 1980. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.
The King Street CSO is a combined sewer overflow regulator and outfall station operated by King County, whose historical discharges of untreated and poorly treated wastewater deposited toxics in sediment along Seattle's waterfront. The site was identified under King County's 1999 Sediment Management Plan as one of seven CSOs requiring cleanup. Remediation to date has included placement of a sediment cap in 1990 with post-capping monitoring through 1996 and dredging near an outfall pipe in 1995; additional dredging of a separate area is planned but not yet completed. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.
Why Historical Insurance Policies May Be Accessible
Pre-1986 Commercial General Liability (CGL) policies were occurrence-based and did not contain an effective pollution exclusion in Washington. If contamination occurred while those policies were active, those historical insurance carriers may still have a legal obligation to fund the cleanup costs, even if the business closed or the property changed hands.
The most significant remediation expenditures at King Street CSO lie ahead: dredging of the remaining contaminated sediment area has not yet commenced, and that work is tied to contamination accumulating at this outfall since at least 1980, when flow records at the King Street Regulator Station were already being documented. Historical carriers who issued CGL policies to King County during those pre-1986 operating years may be obligated to fund that pending dredging work. The costs already incurred — sediment capping, the 1995 dredging, and years of post-cap monitoring — represent a secondary but real claim against those same policies.
Restorical's role is to locate viable historical policies, determine whether a successful coverage claim is possible, and assist our clients and their legal counsel to obtain insurance coverage. Restorical then manages the claim, including accounting, to ensure the cleanup is funded in a timely manner.
What We Look For
- Historical insurance policies (pre-1986)
- Policy numbers, carrier names, and coverage periods
- Connection between contamination timing and policy period
- Evidence linking cleanup obligation to insured activity
What We Deliver
- Historical Coverage Chart
- Trigger Analysis & Property/Policy Nexus
- Coverage strategy with recommendations
- Insurance funding for your remediation
- Claims Management & Forensic Accounting
The Restorical Proven Process
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Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


