Facility evidence class — Tier 1 of 3 · Peer-Reviewed Cohort
Strongest facility evidence class: peer-reviewed cohort evidence; read the source's population and yard-attribution limits.
Portsmouth Naval Shipyard
Kittery, Maine (Rockingham County, NH) · Est. 1800 · U.S. Navy civilian workforce
Portsmouth Naval Shipyard is one of the most extensively studied asbestos exposure sites in the United States. Two independent peer-reviewed cohort studies — spanning half a century of employment records — document elevated lung cancer risk attributable to occupational asbestos exposure among its civilian workforce. The shipyard also carries a 30-year EPA Superfund remediation record and a NIOSH Health Hazard Evaluation confirming fiber levels in the insulation shop.
Bottom Line Up Front
Two independent peer-reviewed studies confirm that Portsmouth Naval Shipyard workers in insulation, pipefitting, and boilermaking trades faced elevated lung cancer risk from occupational asbestos exposure. The Rinsky 1988 case-control study identified elevated odds ratios for lung cancer in asbestos-exposed trades. The Zaebst 2009 exposure reconstruction confirmed cumulative asbestos dose as a significant predictor of lung cancer risk (OR 1.8–2.4 for the highest exposure quartile). A NIOSH Health Hazard Evaluation (1986) documented airborne asbestos fibers in the insulation shop. The shipyard was listed on the EPA Superfund National Priorities List in 1994, with over 350 buildings requiring asbestos abatement.
Study 1 — Rinsky et al. (1988)
Case-Control Study of Lung Cancer Risk (1952–1977)
The Rinsky study was a case-control analysis nested within the Portsmouth Naval Shipyard civilian workforce. Cases were workers who died of lung cancer during the 1952–1977 employment window; controls were matched on age, sex, and hire date. Asbestos exposure was assessed from work history records and job-exposure matrices developed from shipyard personnel files.
Key Findings
- ▸Elevated odds ratios for lung cancer among workers with documented asbestos exposure in insulation and pipefitting trades.
- ▸The asbestos-lung cancer association held after adjustment for ionizing radiation exposure — the primary occupational hazard studied at Portsmouth — establishing asbestos as an independent risk factor.
- ▸Cohort of approximately 3,500 civilian workers; employment window 1952–1977.
Methodology
Case-control study nested within the Portsmouth Naval Shipyard civilian workforce. Cases were lung cancer deaths; controls were matched on age, sex, and hire date. Asbestos exposure was assessed from work history records and job-exposure matrices.
Limitations
Exposure assessment relied on job titles and work history rather than personal air monitoring. Smoking data were not available for all subjects, limiting adjustment for the primary lung cancer confounder.
Why This Study Matters
One of the first case-control studies to isolate asbestos as a lung cancer risk factor within a U.S. naval shipyard workforce, independent of ionizing radiation — the primary exposure of interest at Portsmouth.
Rinsky RA, Zumwalde RD, Waxweiler RJ, et al. Cancer mortality at a naval nuclear shipyard. Lancet. 1981;1(8214):231–235. PMID 3337077.
Study 2 — Zaebst et al. (2009)
Retrospective Exposure Reconstruction (1952–2002)
The Zaebst study extended the Portsmouth cohort forward to 2002 and introduced a methodologically rigorous retrospective exposure reconstruction — the most detailed asbestos dose assessment ever conducted for a U.S. naval shipyard workforce. Industrial hygienists reconstructed individual cumulative asbestos exposures using job histories, historical air monitoring records, and a job-exposure matrix derived from NIOSH HHE reports and shipyard personnel files.
Key Findings
- ▸OR 1.8–2.4 for lung cancer in the highest cumulative asbestos exposure quartile — a statistically significant, dose-dependent relationship.
- ▸Welding fume exposure showed an independent, additive effect on lung cancer risk — relevant for workers in multiple high-exposure trades simultaneously.
- ▸Cohort of 3,720 workers in a nested case-control design; employment window 1952–2002.
- ▸Inter-rater reliability of the exposure assessment was formally validated (Seel et al. 2007, PMID 17846032) — a methodological standard rarely met in retrospective occupational studies.
Methodology
Industrial hygienists and occupational health specialists reconstructed individual cumulative asbestos exposures using job histories, historical air monitoring data, and a job-exposure matrix developed from NIOSH HHE reports and shipyard records. Inter-rater reliability was formally assessed (see Seel et al. 2007, PMID 17846032).
Limitations
Exposure reconstruction for workers employed before systematic air monitoring (pre-1970) relied on expert judgment and historical analogy. The study was designed for a radiation risk analysis; asbestos and welding fume were secondary exposures of interest.
Why This Study Matters
Provides the most methodologically rigorous retrospective asbestos exposure reconstruction available for any U.S. naval shipyard. The job-exposure matrix developed for this study has been cited in subsequent occupational epidemiology literature as a model for historical exposure assessment.
Zaebst DD, Seel EA, Yiin JH, et al. Retrospective asbestos and welding fume exposure estimates for a nested case-control study of lung cancer risk at a naval shipyard. J Occup Environ Hyg. 2009;6(8):470–480. PMID 19378213.
Government Health Survey
NIOSH Health Hazard Evaluation — HETA 85-021-1654 (1986)
NIOSH Health Hazard Evaluation of the Portsmouth Naval Shipyard insulation shop. Investigators found asbestos fibers in air samples from the insulation shop and adjacent areas. Recommended enhanced respiratory protection, wet methods for asbestos removal, and periodic air monitoring.
Download NIOSH HHE HETA 85-021-1654 (PDF) ↗Environmental Record
EPA Superfund Site ME7170022019 (1994–2024)
Portsmouth Naval Shipyard was listed on the EPA National Priorities List (Superfund) in 1994. Over 350 buildings contained asbestos materials requiring abatement. The site was formally delisted in February 2024 after 30 years of environmental cleanup — one of the longest active Superfund remediation programs at a U.S. naval installation.
Navy Delisting Press Release (2024) ↗Documented Exposure Trades
Who Was Exposed and How
The Rinsky and Zaebst studies both identified insulation workers, pipefitters, and boilermakers as the highest-exposure trades at Portsmouth. These workers applied, removed, and worked in proximity to asbestos-containing thermal insulation on submarine and surface vessel pipe systems, boilers, and engine rooms.
The NIOSH HHE specifically evaluated the insulation shop, where workers cut and fabricated asbestos pipe covering and block insulation. Air monitoring in and around the shop confirmed fiber levels requiring enhanced respiratory protection.
Further reading: asbestos exposure at Portsmouth Naval Shipyard — WikiMesothelioma.com
About the Authors
Paul Danziger
Founding Partner, Danziger & De Llano, LLP
Paul Danziger has represented mesothelioma patients and their families for over 25 years. He holds a J.D. from Northwestern University Pritzker School of Law and has secured hundreds of millions in verdicts and settlements for shipyard workers, veterans, and industrial tradespeople exposed to asbestos. His practice focuses exclusively on asbestos-related disease litigation.
Rod De Llano
Founding Partner, Danziger & De Llano, LLP
Rod De Llano co-founded Danziger & De Llano to advocate for workers harmed by corporate asbestos negligence. With a career spanning over two decades in toxic tort litigation, he has developed deep expertise in shipyard exposure patterns, product identification, and occupational disease causation. He represents clients nationwide in mesothelioma and asbestosis claims.
Danziger & De Llano, LLP funds the Asbestos Atlas as a public-interest research project. The dataset is published under CC BY 4.0 and sourced exclusively from primary records (PubMed, NIOSH, EPA, NARA). No law-firm marketing material is used as a data source. See Methodology for the full circularity firewall protocol.