Mesothelioma Lawyer Missouri: Legal Rights for Metropolitan Sanitary District Asbestos Exposure

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The Metropolitan Sanitary District of Greater Chicago — now the Metropolitan Water Reclamation District (MWRD) — operated one of the largest wastewater treatment and water infrastructure systems in the country throughout much of the twentieth century. Tens of thousands of skilled tradespeople worked at district facilities and may have been exposed to asbestos-containing materials during the ordinary course of their employment — often without warning, without protective equipment, and without being told about hazards the manufacturers already knew about.

Decades later, workers and their family members are being diagnosed with mesothelioma, asbestosis, lung cancer, and other asbestos-related diseases. If that describes you or someone you love, you have legal rights and may be entitled to substantial compensation. An experienced asbestos cancer lawyer St. Louis can evaluate your claim and identify every source of recovery available to you.

Facility History and Asbestos Exposure Background

The Sanitary District of Chicago was established by the Illinois General Assembly in 1889 to address public health crises caused by sewage and industrial contamination of Lake Michigan — Chicago’s drinking water source. The district’s most recognized engineering achievement was the reversal of the Chicago River in 1900.

Original name: Sanitary District of Chicago (1889)
Current name: Metropolitan Water Reclamation District of Greater Chicago (MWRD) — renamed in 1989
Current service area: Approximately 10.35 million people across 883 square miles of Cook County

Major Facilities and Asbestos Exposure Sites

At its operational peak, the Metropolitan Sanitary District operated or maintained multiple large-scale facilities across the Chicago metropolitan area where workers may have been exposed to asbestos-containing materials:

Stickney Water Reclamation Plant (Stickney, Illinois) — One of the world’s largest wastewater treatment plants, covering approximately 570 acres. This facility reportedly contained extensive asbestos-containing insulation on boiler systems, steam piping, and process equipment from original construction through major renovations in the 1970s and 1980s.
Calumet Water Reclamation Plant (Chicago’s Southeast Side) — Major treatment facility with substantial boiler and piping infrastructure where workers may have been exposed to asbestos-containing materials
Terrence J. O’Brien Water Reclamation Plant (formerly North Side Water Reclamation Plant) — Process equipment and steam systems reportedly insulated with asbestos-containing materials
Hanover Park Water Reclamation Plant
Lemont Water Reclamation Plant
North Shore Channel and Tunnel Infrastructure — Maintenance and repair work in confined spaces reportedly involving disturbance of asbestos-containing materials
Mainstream Pumping Station
Numerous pumping stations, valve vaults, and maintenance facilities throughout Cook County

Workforce and Union Representation

The Metropolitan Sanitary District employed a substantial skilled trades workforce represented by multiple unions. Members of the following unions may have been exposed to asbestos-containing materials during work at district facilities:

United Association of Plumbers and Pipefitters — members reportedly worked directly with asbestos-containing pipe covering, gaskets, and packing materials
International Brotherhood of Boilermakers — members allegedly installed and removed boiler insulation containing asbestos-containing materials
International Association of Machinists and Aerospace Workers
International Brotherhood of Electrical Workers (IBEW)
Heat and Frost Insulators and Allied Workers (formerly Asbestos Workers) — including Local 1 and Local 27 — members installed and removed asbestos-containing insulation as their primary trade and may have faced the heaviest exposures of any trade group at these facilities
Operating Engineers
Laborers’ International Union of North America (LIUNA)
Teamsters

Contractors and construction workers performing renovation and maintenance projects at district facilities may also have been exposed to asbestos-containing materials in the ordinary course of their work.

Why Asbestos Was Pervasive at Water Treatment Infrastructure

Industrial Properties That Drove Asbestos Adoption

Asbestos-containing materials became industrial standard because the mineral solved real engineering problems:

Withstands temperatures exceeding 1,000°F without degrading
Reduces heat loss in steam and hot water systems
Resists corrosive chemicals found in wastewater treatment environments
Reinforces gaskets, packing, and composite materials
Provides fire protection in structural and equipment applications
Functions as electrical insulation in certain switchgear applications
Low cost, widely available, with established engineering specifications

The problem — which manufacturers knew and concealed — is that disturbing asbestos-containing materials releases microscopic fibers that, once inhaled, lodge permanently in lung tissue and can cause mesothelioma, asbestosis, and lung cancer decades later.

Water Reclamation Facilities: High-Risk Asbestos Environments

Steam and Hot Water Systems

Large water treatment plants ran pumps, digesters, aerators, and process equipment on steam and hot water. All piping above threshold temperatures required thermal insulation. For most of the twentieth century, that insulation was asbestos-containing pipe covering, block insulation, and fitting covers — products manufactured by Johns-Manville, Owens-Illinois, and Armstrong World Industries, among others. Workers who cut, fit, or disturbed that insulation may have been exposed to significant concentrations of airborne asbestos fibers.

Boiler Plants

Every major district facility maintained large boiler installations generating steam for process heat, space heating, and power generation. Boilers were among the most heavily insulated equipment on site. Components reportedly wrapped in asbestos-containing insulation included boiler shells, flues, smoke boxes, drums, and associated piping — using products such as Johns-Manville Kaylo, Johns-Manville Thermobestos, and Owens-Illinois asbestos pipe covering, among others.

Process Equipment

Anaerobic digesters, heat exchangers, sludge dryers, and similar equipment operated at elevated temperatures and required thermal insulation. Manufacturers supplying these products reportedly included Johns-Manville, Owens-Illinois, and Fibreboard.

Pumps and Valves

Facilities contained hundreds to thousands of pumps, valves, flanges, and fittings. Pump packing, valve packing, and flange gaskets were routinely manufactured with asbestos-containing materials — primarily from Garlock Sealing Technologies and John Crane Co. — throughout most of the twentieth century. Mechanics who cut, removed, or replaced this packing and these gaskets may have been exposed to asbestos-containing dust during each repair.

Electrical Infrastructure

Large electrical systems allegedly contained asbestos-containing products including arc chutes in switchgear, electrical panel linings, insulation in motor control centers, and components in vintage equipment from manufacturers such as Westinghouse and General Electric.

Building Construction Materials

Older facilities — many built in the early to mid-twentieth century — reportedly incorporated:

Asbestos-cement board (Transite) in structural and non-structural applications
Asbestos-containing floor tiles and vinyl floor covering
Asbestos-containing ceiling tiles from Johns-Manville, Armstrong, and Georgia-Pacific
Asbestos-containing roofing materials
Spray-applied fireproofing products including Monokote and Aircell on structural steel
Asbestos-containing wallboard and insulating board from Armstrong, Johns-Manville, and Georgia-Pacific

Renovation and demolition work on these materials — common during facility upgrades — created conditions under which workers may have been exposed to released asbestos fibers.

Timeline: Asbestos Use and Regulatory History

Pre-1940s: Asbestos Becomes Industrial Standard

By the early twentieth century, asbestos-containing insulation was the accepted standard for industrial thermal insulation. Key manufacturers supplying facilities like the Metropolitan Sanitary District included:

Johns-Manville (dominant supplier of thermal insulation products nationwide)
Owens-Illinois
Keasbey & Mattison
Philip Carey Manufacturing
Armstrong World Industries

Workers involved in early district construction — including original Stickney plant construction phases in the 1930s and subsequent expansions — may have been exposed to asbestos-containing materials from these manufacturers during installation, maintenance, and repair of thermal insulation systems.

1940s–1960s: Peak Asbestos Use Period

The postwar era represented peak asbestos use in American industrial facilities:

New boilers, heat exchangers, and process equipment were routinely insulated with asbestos-containing materials
Asbestos pipe covering from Johns-Manville, Owens-Illinois, Fibreboard, Carey, and Armstrong was standard specification
Asbestos-containing block insulation and fitting covers from Johns-Manville (Kaylo products) and Owens-Illinois were reportedly installed on all steam and hot water systems above specified temperatures
Asbestos-containing gaskets and packing from Garlock Sealing Technologies and John Crane Co. were allegedly used throughout pump and valve infrastructure
Asbestos-containing flooring and ceiling products from Armstrong, Kentile, and National Gypsum were reportedly used in construction and renovation of administrative and support buildings
Thermal spray products including Monokote, Aircell, and Superex were allegedly applied for structural fireproofing on steel frameworks
Asbestos-containing wallboard and insulating board from Johns-Manville and Georgia-Pacific were reportedly used in partition work and construction

Workers employed during this period may have experienced some of their heaviest asbestos exposures. Insulators working under union agreements with Heat and Frost Insulators Local 1 and similar organizations faced particular risks given the nature of their trade work.

Late 1960s–1970s: Scientific Evidence and Continued Use

Scientific understanding of asbestos hazards expanded through the late 1960s and early 1970s, driven by landmark research by Dr. Irving Selikoff at Mount Sinai Hospital. Selikoff documented elevated rates of mesothelioma and asbestosis among insulation workers — many represented by Heat and Frost Insulators unions.

Despite this evidence, Johns-Manville, Owens-Illinois, and other manufacturers continued supplying asbestos-containing materials to industrial facilities. Internal company documents produced in subsequent litigation established that multiple manufacturers knew of asbestos health hazards years or decades before warning workers or the public. That concealment is at the center of most asbestos litigation today.

Key regulatory milestones during this period:

1971: OSHA established the first federal permissible exposure limit (PEL) for asbestos at 5 fibers per cubic centimeter (5 f/cc)
1972: OSHA reduced the PEL to 2 f/cc
1976: The Toxic Substances Control Act (TSCA) gave EPA authority to regulate asbestos
1978: EPA banned spray-applied asbestos-containing fireproofing products

Workers employed at district facilities during this period may have been exposed to asbestos-containing materials still in place on older equipment, or to new asbestos-containing products that remained in commerce. Demolition and renovation work on older asbestos-containing installations created some of the highest-exposure conditions of this era.

1980s: Stricter Regulation and Abatement Activity

1986: OSHA tightened the asbestos PEL to 0.2 f/cc — a tenfold reduction from the 1972 standard
1986: The Asbestos Hazard Emergency Response Act (AHERA) mandated asbestos inspections and management plans for schools and certain other facilities
1989: EPA attempted a near-total ban on asbestos under TSCA; the ban was largely overturned by the Fifth Circuit Court of Appeals in 1991

Abatement projects at Metropolitan Sanitary District facilities during this period may have generated substantial asbestos fiber release if controls were inadequate. Workers performing abatement — or working in proximity to abatement activity — may have been exposed to elevated concentrations of airborne asbestos fibers during this phase.

Occupations with Highest Asbestos Exposure Risk

Workers employed at Metropolitan Sanitary District facilities included those in trades that reportedly carried elevated asbestos exposure risk. Individual exposure history must