Why Iowa Was a Major Center for Industrial Asbestos Exposure

Iowa’s industrial legacy is defined by the Mississippi River corridor, the Quad Cities manufacturing belt, and a statewide network of power generation, agricultural machinery production, and food processing that employed insulation trades for decades. The labor infrastructure that built and maintained Iowa’s industrial facilities was organized through trades that followed work across the Iowa-Illinois border without regard to state lines.

Heat and Frost Insulators Local 29 — Des Moines — covered industrial insulation work throughout central and western Iowa. Local 29 members were present at virtually every major power plant, refinery, and chemical facility in Iowa from the early twentieth century forward. Their work — cutting, fitting, and applying pipe insulation — placed them in direct, sustained contact with asbestos-containing products every working day. The Quad Cities were served by joint Iowa-Illinois locals whose members worked at facilities on both sides of the river.

Iowa’s industrial infrastructure developed in concentrated corridors:

  • Quad Cities (Davenport/Bettendorf) — Alcoa’s aluminum rolling mill in Bettendorf, the Rock Island Arsenal, Caterpillar and Case manufacturing in Rock Island/Moline (IL), and Mississippi River industrial facilities; one of the most concentrated manufacturing corridors in the Midwest
  • Waterloo/Cedar Falls — John Deere’s primary tractor manufacturing complex; one of the largest single-employer industrial campuses in Iowa, operating steam-heated forge presses and heat-treat furnaces with extensive asbestos insulation
  • Cedar Rapids — Collins Radio (Rockwell Collins), Quaker Oats, and industrial manufacturing along the Cedar River
  • Council Bluffs/Omaha metro — railroad shops, power generation, and the eastern terminal of Union Pacific; the Council Bluffs area was home to Walter Scott Jr. Generating Station, one of Iowa’s largest coal plants
  • Sioux City — meatpacking, grain processing, and Missouri River industrial operations with steam-intensive refrigeration and process equipment

The state’s strong labor union tradition meant organized trades were present at every major facility. Union hall records, pension fund hours, and membership rolls create one of the most complete exposure documentation trails of any industrial region in the country — a resource that worksite history specialists regularly use to reconstruct exposure histories from 40, 50, and 60 years ago.

Power Generation

Iowa’s coal-fired power generation sector was among the most asbestos-intensive industries in the state. Every boiler, every turbine, every mile of high-pressure steam pipe had to be insulated against temperatures and pressures that demanded the most heat-resistant materials available. From the 1930s through the 1980s, that meant asbestos — specifically Johns-Manville Thermobestos, Owens Corning Kaylo, Philip Carey Magnesia, Eagle-Picher Superex, and Armstrong World Industries Unibestos.

Major Iowa power generation facilities with documented asbestos histories include Walter Scott Jr. Energy Center (Council Bluffs), Prairie Creek Generating Station (Cedar Rapids), Ottumwa Generating Station (Wapello County), Burlington Generating Station (Des Moines County), Lansing Generating Station (Allamakee County), George Neal South (Woodbury County), and M.L. Kapp Generating Station (Clinton).

Iowa — 7 facilities View Full Interactive Map →

Industrial & Manufacturing Sites

Iowa’s industrial corridor centered on the Quad Cities and the Waterloo manufacturing complex. Alcoa’s Bettendorf aluminum rolling facility operated high-temperature rolling mills and heat-treatment furnaces with asbestos-insulated equipment throughout. John Deere’s Waterloo Tractor Works — one of the largest farm equipment manufacturing facilities in the world — ran steam-heated forge presses and paint cure ovens requiring constant insulation maintenance. The Rock Island Arsenal across the river in Illinois employed Iowa workers throughout the twentieth century. Meatpacking facilities at Waterloo, Perry, Storm Lake, and Sioux City operated steam-heated equipment and asbestos-insulated refrigeration systems in boiler rooms and process areas.

Iowa — 5 facilities View Full Interactive Map →

Phenolic Resin & Plastics Manufacturing

Phenolic resin and thermoset plastics manufacturing is a distinct asbestos exposure pathway that has nothing to do with the pipe-insulation story. At these facilities, asbestos was not applied around pipes as insulation — it was blended directly into every batch of molding compound as a reinforcing filler, at concentrations of up to 5–10% by weight. Workers who loaded compound into press hoppers, trimmed flash from finished parts, and ran tumbling and deflashing machines inhaled asbestos fibers released from the compound itself throughout every production run. Air monitoring at phenolic molding operations measured fiber concentrations at up to 140 times the then-current OSHA permissible exposure limit. Military specification MIL-M-14 mandated asbestos-filled phenolic compounds for defense procurement through the mid-1970s. The principal defendants in these cases are the compound manufacturers — Union Carbide/Bakelite, Durez/Hooker Chemical, Monsanto Resinox, Rogers Corporation, and Plenco — in addition to the facility operator.

Iowa facilities include John Deere (Waterloo) — agricultural machinery engine assemblies, hydraulic systems, and transmission components with asbestos-containing gaskets and seals; Rockwell Collins (Cedar Rapids) — avionics assemblies with phenolic-laminate circuit boards per MIL-M-55110 specification; Collins Radio (Cedar Rapids, pre-merger) — radio and communications equipment with phenolic wiring boards containing asbestos filler manufactured through the early 1970s; Iowa Manufacturing Company (Cedar Rapids) — construction and agricultural equipment components; and Alcoa (Bettendorf) — aluminum processing with phenolic and asbestos-bonded thermal insulation components. Compound suppliers Rogers Corporation and Plenco served Iowa manufacturing customers throughout the region. Additional product suppliers with documented Iowa exposure include Allen-Bradley/Rockwell Automation (asbestos-compound circuit breakers and motor starters in Iowa power and industrial facilities).

Iowa — 5 facilities View Full Interactive Map →

The Illinois Corridor

Iowa workers did not stop working at the Iowa state line. The Quad Cities metropolitan area straddles Iowa and Illinois, and Iowa workers regularly worked across the river at Rock Island Arsenal, Caterpillar’s Rock Island and Peoria facilities, and the industrial complex along the Illinois bank of the Mississippi. Workers from Davenport and Bettendorf union halls pulled shifts at Illinois facilities throughout their careers. The following Illinois sites have documented asbestos histories and are frequently part of Iowa plaintiff exposure histories:

  • Rock Island Arsenal — Rock Island, Rock Island County, IL
  • Caterpillar Tractor (Rock Island) — Rock Island, Rock Island County, IL
  • Case Corporation (Rock Island/East Moline) — Rock Island County, IL
  • International Harvester (East Moline) — Rock Island County, IL
  • John Deere (Moline headquarters and manufacturing) — Rock Island County, IL
  • Powerton Generating Station — Tazewell County, IL
  • Newton Power Station — Jasper County, IL

Important for Iowa residents with Illinois exposure: Where exposure occurred at an Illinois facility, Illinois law governs that claim — including Illinois’s statute of limitations, which is 2 years from diagnosis under 735 ILCS 5/13-202, significantly shorter than Iowa’s two-year window. Iowa workers can and do have claims under both states’ laws simultaneously, depending on where exposure occurred. Illinois has its own active asbestos litigation docket in Madison County. A complete exposure history review is essential to ensure claims in both jurisdictions are properly evaluated.

All Exposed Trades

Every skilled trade that operated in and around heavy industrial facilities carried asbestos exposure risk. The following trades all have documented asbestos disease histories. This is the complete list — not just the most affected:

Primary exposure — direct daily contact with asbestos-containing materials:

  • Heat and Frost Insulators (Local 29, Des Moines; Local 94, Waterloo/Cedar Falls area) — direct application, removal, and maintenance of pipe and equipment insulation; highest fiber counts of any trade
  • Pipefitters and Steamfitters (UA Local 33, Des Moines; Local 125, Waterloo) — cut and disturbed insulation during installation and maintenance of piping systems
  • Boilermakers (Local 105, Des Moines) — boiler assembly, repair, and tear-out; intensive refractory and gasket exposure
  • Plumbers — pipe installation in buildings with asbestos-containing cements and joint compound

Secondary exposure — regular proximity to asbestos work:

  • Electricians (IBEW Local 347, Des Moines; Local 405, Cedar Rapids) — ran conduit and wire through the same mechanical spaces where insulators and pipefitters worked
  • Sheet Metal Workers — duct installation adjacent to insulated pipe runs; asbestos-containing duct lining
  • Iron Workers and Structural Steel Workers — fireproofing spray (W.R. Grace Monokote, MK-3) applied to structural steel they erected
  • Millwrights — machinery installation and maintenance in heavily insulated mechanical rooms
  • Operating Engineers — worked heavy equipment in areas where asbestos was being applied or removed; some operated spray application equipment

Bystander and construction trades exposure:

  • Carpenters — finish work in buildings with asbestos floor tile, ceiling tile, and joint compound (Georgia-Pacific, National Gypsum)
  • Drywall Workers and Plasterers — asbestos-containing joint compound mixed and sanded in enclosed spaces; one of the most significant non-industrial exposure pathways
  • Tile Setters and Floor Layers — asbestos vinyl floor tile (Armstrong, Congoleum) cut and scored daily
  • Painters — sanded and prepared surfaces containing asbestos-based textured coatings and joint compound
  • Bricklayers and Masons — worked with asbestos-containing refractory brick and mortar in industrial furnaces and boilers
  • Laborers — present across all trades; swept up asbestos debris, moved materials, assisted with tearout
  • Roofers — asbestos-containing roofing felt, shingles, and mastic
  • Machinists — asbestos gaskets cut to fit, asbestos brake and clutch linings machined in shops
  • Welders — worked in proximity to asbestos insulation torn back to allow welding; welding blankets often asbestos

Industrial and utility trades:

  • Power Plant Operators — spent careers in facilities with asbestos pipe systems throughout; disturbed during operation and maintenance
  • Railroad Workers — locomotive insulation, station buildings, and shop facilities all heavily asbestos-insulated; Rock Island Railroad and Union Pacific shops in Iowa employed large numbers of insulation tradesmen
  • Auto Mechanics — brake and clutch lining, gaskets; separate and significant exposure pathway

Military and shipyard:

  • Navy Veterans — U.S. Navy ships were among the most heavily asbestos-insulated environments ever built; every shipyard, engine room, and boiler room was lined with asbestos; veterans have specific VA benefit pathways in addition to civil claims
  • Shipyard Workers — Iowa’s Mississippi River repair facilities and barge construction operations used asbestos extensively

Secondary and Household Exposure — Wives and Children

Asbestos did not stay at the jobsite. Workers carried it home on their clothes, hair, skin, and work boots every day.

Take-home exposure — also called secondary or household exposure — has been documented in medical literature for decades. Family members of asbestos workers developed mesothelioma without ever setting foot on an industrial site. The mechanisms are direct:

  • Laundering work clothes — wives who shook out, sorted, and washed asbestos-laden work clothing were exposed to fiber releases equivalent to those experienced in some work environments
  • Physical contact at the end of the workday — embracing a husband or father who had worked with asbestos without changing out of work clothes transferred fibers to family members
  • Contaminated vehicles — fibers carried into family cars became embedded in upholstery and floor mats, creating ongoing exposure for everyone who rode in those vehicles
  • Children playing near work areas — in households where work equipment or clothing was stored, children playing nearby were exposed

Secondary exposure claims are legally distinct from workers’ claims but are equally recognized under Iowa and Illinois law. A spouse or child of a worker who developed mesothelioma as a result of household exposure has an independent legal claim against the manufacturers of the asbestos-containing products that caused the family member’s exposure.

Documenting Exposure When the Jobsite Was 40 or 50 Years Ago

Many workers and families feel discouraged from pursuing claims because they cannot fully remember every jobsite, every employer, or every product from decades past. This is expected, not disqualifying. Worksite history reconstruction is an established practice in asbestos litigation, and there are specialists whose work is specifically building that record.

Sources used to reconstruct exposure histories include:

  • Union pension fund hour records — most union locals maintained hour records by employer and year; Local 29 and Local 33 records can identify exactly which facilities a member worked at and for how long
  • Social Security earnings records — employer-by-employer income records maintained by the SSA document a complete work history
  • OSHA inspection records and citations — federal inspection records document products found at specific facilities during specific periods
  • FERC power plant filings — maintenance and capital expenditure records document equipment in place at power generation sites
  • Publicly filed depositions — co-workers who testified in prior asbestos cases frequently described the products they saw used at specific facilities; this testimony is in the public court record
  • Union hall archives and newsletters — jobsite assignments, safety committee records, and membership publications document which members worked where
  • Historical photographs — industrial photography archives at institutions including the State Historical Society of Iowa (Iowa City and Des Moines), University of Iowa Special Collections, and Iowa State University Special Collections (Ames) contain photographs of Iowa industrial facilities that document working conditions and materials

Old photographs, a pay stub from a single employer, a pension statement, or a union membership card from decades ago can be the starting point for a full exposure history reconstruction. Incomplete memory is not a barrier to filing — it is where the reconstruction work begins.

Products, equipment, and companies referenced throughout this site are drawn from public asbestos litigation records, court filings, EPA and OSHA regulatory databases, FERC filings, and publicly available industry documentation. Where specific products are identified at specific facilities, that identification reflects what fellow tradesmen at those jobsites have alleged in publicly available depositions or what has been documented in publicly filed regulatory and litigation records. These references do not constitute independent findings of liability against any company, and this site does not adopt third-party allegations as established fact. All product identifications are attributed to their source public records.

This website is published by Rights Watch Media Group LLC, an independent media organization that publishes authoritative public domain information resources for Iowa residents.