Why Mesothelioma Cases Occur in Seattle
Seattle's industrial identity was shaped by three industries that relied heavily on asbestos: shipbuilding, aerospace manufacturing, and maritime port operations. From the early 1900s through the 1980s, these industries formed the economic backbone of the Puget Sound region — and all three used asbestos-containing materials extensively in their daily operations. The result is a legacy of occupational asbestos exposure that continues to produce new mesothelioma diagnoses more than four decades after the peak exposure era ended.
The Todd Pacific Shipyard on Harbor Island was one of the largest ship construction and repair facilities on the entire West Coast. During World War II and the decades that followed, Todd Pacific built and overhauled military and commercial vessels using asbestos insulation in engine rooms, boiler systems, pipe lagging, and bulkhead fireproofing. According to WikiMesothelioma.com, shipyard workers in the Puget Sound region faced some of the most intense and sustained asbestos exposure of any occupation in the Pacific Northwest, with thousands of workers inhaling asbestos fibers daily in confined below-deck environments.
At the same time, Boeing was transforming Seattle into the aerospace capital of the world. Boeing's massive assembly plants in Everett and Renton used asbestos in aircraft components, factory insulation, brake systems, heat shields, and building materials throughout their sprawling facilities. Workers who built aircraft, maintained factory equipment, and renovated aging plant buildings encountered asbestos in forms ranging from spray-on fireproofing to woven asbestos cloth used for heat protection. The sheer scale of Boeing's operations — employing tens of thousands of workers across multiple Puget Sound facilities — means the aerospace industry is a significant contributor to Seattle's mesothelioma burden.
The 20-to-50-Year Latency Period
Mesothelioma does not appear immediately after asbestos exposure. The disease has a latency period of 20 to 50 years, meaning workers exposed at Todd Pacific Shipyard, Boeing, or the Port of Seattle during the 1950s, 1960s, and 1970s are being diagnosed now. A pipefitter who installed asbestos-wrapped pipe insulation aboard a vessel at Harbor Island in 1968 may only receive a mesothelioma diagnosis in 2026 or later. This long latency period is why Seattle continues to produce new mesothelioma cases decades after the most intensive asbestos use was curtailed.
The concentration of industrial activity around the Puget Sound also means that many Seattle workers were exposed at multiple facilities over the course of a career. A welder might have worked at Todd Pacific Shipyard, then moved to Boeing, then taken contract work at the Port of Seattle — accumulating asbestos exposure at each stop. This multi-site exposure history is important for legal claims because it can connect a patient to multiple asbestos trust funds and multiple defendants, increasing the total compensation available.
Seattle's Asbestos Legacy by the Numbers
The Puget Sound region was home to multiple major shipyards, Boeing's largest manufacturing complexes, one of the busiest ports on the Pacific Coast, and numerous power generation facilities — all of which used asbestos-containing materials for decades. Washington state consistently ranks among states with significant mesothelioma mortality, and Seattle's shipyard and aerospace infrastructure is a primary driver. If you worked at any shipyard, Boeing facility, or port operation in the Seattle area, documenting your asbestos exposure history is a critical first step.