About Monsanto Cardonlet

The Monsanto Carondelet facility — documented in occupational health records and asbestos litigation — was a large-scale industrial chemical manufacturing site operated by Monsanto Company in the Carondelet neighborhood of southern St. Louis, Missouri. The plant sat along the Mississippi River with direct access to river transport, major rail lines, and the skilled trades workforce concentrated in the St. Louis manufacturing corridor.

The facility reportedly operated from approximately 1941 through 1985, producing industrial and specialty chemical products consistent with Monsanto’s manufacturing portfolio during that era. It was part of the larger Mississippi River industrial corridor that encompassed significant chemical and heavy manufacturing activity on both the Missouri and Illinois sides of the river.

Plants operating at this scale ran:

  • High-temperature reactors and distillation columns
  • Steam piping networks operating at temperatures exceeding 800°F
  • Furnaces and boilers requiring continuous thermal management
  • Turbine-driven equipment and rotating machinery
  • Large-diameter vessels and heat exchangers

Every one of these systems relied on asbestos-containing materials as the accepted engineering standard through the mid-twentieth century. Workers employed at this facility, contractors brought in for turnarounds and capital projects, and family members who handled work clothing are among those who may have been exposed to asbestos fibers released from those materials.

General Equipment at Monsanto Cardonlet

The equipment below represents the systems and infrastructure documented or typically present at this facility during the era when asbestos-containing materials were specified in industrial construction. This is general facility-equipment reference — not a legal attribution of any specific product, manufacturer, or exposure event to this facility. Material-category and manufacturer information is addressed in the AsbestosIndex Product Crosswalk linked under the records table below.

Reactor Vessels View crosswalk › Process Boilers View crosswalk › Industrial Mixers View crosswalk › Heat Exchangers View crosswalk › Cooling Towers View crosswalk › Pipe Insulation View crosswalk › Valves View crosswalk › Gaskets View crosswalk › Storage Tanks View crosswalk ›

Documented Asbestos Evidence — Missouri

The records below are verified, state-documented asbestos removals at this facility. Each entry represents a regulated abatement project where the Missouri Department of Natural Resources (Missouri DNR) was notified under federal NESHAP rules, the work was logged, and the asbestos-containing material was confirmed and removed under regulated conditions. These are not allegations or estimates — they are paper records tying documented asbestos-containing material to this specific site.

No Missouri DNR NESHAP abatement notifications have been identified for this facility in current public records. Per the framing above, absence of state-agency documentation should not be read as absence of asbestos — only as absence of a formal, regulated abatement event meeting reporting thresholds. Workers who recall encountering pipe insulation, block insulation, gaskets, or other asbestos-era construction materials at this facility may still have viable claims regardless of whether a state record exists.

Material Categories in Documented Records

The materials documented above (and similar asbestos-containing materials commonly encountered in records of this type) appear in the AsbestosIndex catalog with historical manufacturer and trust-fund information. Click a category to view manufacturers historically associated with that material:

Thermal System Insulation View crosswalk › Asbestos-Cement Board View crosswalk › Pipe Insulation View crosswalk › Roofing & Flashing View crosswalk › Spray Fireproofing View crosswalk › Floor Tile & Mastic View crosswalk › Ceiling Tile View crosswalk › Gaskets & Packing View crosswalk ›

Who May Have Been Exposed at Monsanto Cardonlet

Insulators worked directly with pipe covering, block insulation, and insulating cement every shift. They appear among the most heavily exposed trades in asbestos litigation records because they handled asbestos-containing materials as their primary job function, worked in confined spaces — pipe racks, trenches, valve pits — where fiber concentrations spiked, cut, fit, and installed materials with no respiratory protection in earlier decades, and mixed and applied insulating cement from sacks, a consistently dusty operation. Insulators appear among Heat and Frost Insulators Local 1 and Affiliated Locals.

Pipefitters maintained, repaired, and replaced miles of steam, process, and utility piping throughout the plant. Exposure at Carondelet allegedly involved breaking flanged connections and replacing valves which disturbed existing pipe covering, heat exchanger bundle pulls requiring removal of surrounding ACMs, gasket cutting — shaping new compressed-asbestos gaskets from sheet stock, a routine task alleged to have released measurable fiber concentrations, working alongside insulators performing simultaneous work on the same unit, and wire-brushing old gasket material from flange faces. Pipefitters appear among UA Local 562 and Affiliated Locals.

Boilermakers worked on fired equipment, reactors, and pressure vessels, removing and replacing refractory in furnaces, kilns, and heater boxes, entering boilers and process heaters through confined access openings lined with ACMs, and working in proximity to open furnace doors and high-temperature zones where refractory was disturbed. Boilermakers appear among Boilermakers Local 27 and Affiliated Locals. Electricians at Carondelet may have been exposed when cutting or drilling through asbestos-containing electrical panels or enclosures, working near spray-fireproofed structural steel, running conduit through areas where insulation work was underway, and servicing older switchgear containing asbestos-containing arc-chute materials. Millwrights and Mechanics serviced pumps, compressors, agitators, and rotating equipment, routinely breaking flanged connections sealed with asbestos-containing gaskets and packing, cleaning valve bodies and pump mating surfaces where gasket material had deteriorated in place over years of service, and wire-brushing embedded gasket material from equipment faces. Construction and Maintenance Contractors brought in for capital projects and annual turnarounds often received no plant-specific safety training, worked in areas being simultaneously demolished and rebuilt, and had no knowledge that materials they were cutting, grinding, or removing allegedly contained asbestos. Chemical Operators and General Laborers not directly involved in insulation or mechanical work may still have been exposed as bystanders: control board operators and shift supervisors who walked unit areas during active maintenance, utility workers assigned to areas undergoing repair, and workers who shared locker rooms or break areas with tradespeople handling ACMs.

Missouri — Filing Deadline & Next Steps

Missouri law gives mesothelioma and asbestos-disease claimants 5 years from the date of medical diagnosis to file a personal-injury lawsuit (Mo. Rev. Stat. § 516.120). For wrongful-death claims after an asbestos-related death, the filing window is 3 years from the date of death (Mo. Rev. Stat. § 537.100). The two deadlines run on separate tracks — preserving one does not extend the other.

The personal-injury clock runs from diagnosis, not from exposure. Mesothelioma latency is typically 20 to 50 years, so workers exposed in the 1950s–1980s are being diagnosed today.

Practical first steps

  1. Document what you remember. Pay stubs, W-2s, union cards, photographs, coworker names, and dates of employment. The WorkChain widget on this page can save a copy you can email yourself.
  2. Preserve medical records. Pathology reports, biopsy results, imaging, and pulmonary-function tests are central to both civil claims and trust-fund filings.
  3. Identify household members. Spouses who laundered work clothing and children of plant workers are eligible for secondary-exposure claims when diagnosed with an asbestos-related disease.
  4. Speak with an asbestos attorney with Missouri experience. The first conversation is free and confidential. Asbestos trust-fund claims and civil claims run on different tracks — both can be pursued in parallel.

Asbestos-Related Diseases — Missouri

Asbestos fiber exposure can cause several specific diseases that typically appear decades after the original exposure. The latency period — the gap between exposure and diagnosis — usually runs 20 to 50 years. That's why workers exposed in the 1960s, 1970s, and 1980s are receiving diagnoses today.

Mesothelioma

A rare, aggressive cancer that affects the lining of the lungs (pleural mesothelioma), abdomen (peritoneal), or heart (pericardial). Mesothelioma is almost exclusively caused by asbestos exposure, which is why a mesothelioma diagnosis often points directly to historical workplace exposure. Average latency from first exposure to diagnosis is 30-50 years.

Asbestosis

A chronic, non-cancerous scarring of lung tissue caused by inhaled asbestos fibers. Asbestosis causes progressive shortness of breath, persistent cough, and reduced lung function. It does not improve with treatment, and it is a recognized basis for a claim under most trust schedules and civil claims.

Lung Cancer

Asbestos exposure significantly increases the risk of lung cancer, particularly when combined with a history of smoking. Asbestos-related lung cancer is compensable under the same trust schedules and civil claim avenues as mesothelioma.

Other Recognized Diseases

Pleural plaques, pleural thickening, laryngeal cancer, ovarian cancer, and certain gastrointestinal cancers are also recognized as asbestos-related under various trust schedules and case-law authorities, though eligibility and proof requirements vary by claim type.

If you have any of these diagnoses and you worked at this facility, lived with someone who did, or were exposed in any documented capacity, you may have a claim worth pursuing. Speak with an attorney before assuming you don't qualify.

Cross-State & Regional Corridor Workers

The plant sat along the Mississippi River with direct access to river transport, major rail lines, and the skilled trades workforce concentrated in the St. Louis manufacturing corridor. It was part of the larger Mississippi River industrial corridor that encompassed significant chemical and heavy manufacturing activity on both the Missouri and Illinois sides of the river.

Data Sources — Missouri

Information about facility equipment, industrial materials, and occupational records referenced on this page is drawn from publicly available sources where applicable, including:

If specific equipment or product claims in this article are sourced from a non-public database, the source is identified parenthetically within the text above.