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Last updated: September 2026
This directory lists 34 union plumbing contractors across the United States, from specialized medical gas installers to comprehensive industrial process piping providers.
Buyers in this category are typically solving problems related to large-scale commercial build-outs, complex institutional projects, or industrial expansions requiring precise pipefitting and specialized certifications like NFPA 99 for medical gas systems. They seek partners who can provide a stable, highly trained workforce through established union halls and can efficiently manage projects subject to specific labor agreements and safety standards, including rigorous backflow prevention protocols.
Supplier types in this space range from multi-state mechanical contractors handling entire HVAC and plumbing packages with significant prefabrication capabilities, to regional specialists focusing solely on plumbing installations for commercial or residential developments, and even dedicated service and maintenance providers. What distinguishes them often comes down to their specific local affiliations, their capacity for in-house BIM coordination, and their track record with diverse project delivery methods like design-build.
To prepare effectively, buyers should have clear project specifications, detailed scope of work documents, and an understanding of their project's prevailing wage requirements, if applicable. Suppliers, in turn, expect comprehensive blueprints, project timelines, and transparency regarding site access and coordination with other trades. Having an upfront discussion about material procurement strategies and potential value engineering opportunities can streamline the bidding process.
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34 companies nationwide
Acorn Plumbing Services LLC is a family-owned and operated company providing fair, convenient, and affordable residential and commercial plumbing repairs. They offer free estimates with upfront pricing, no trip or service charges, and 24/7 availability. Fully licensed, insured, and guaranteed, they serve Orange, Seminole, Osceola, and Lake Counties.
American Plumbing & Heating provides comprehensive, high-quality plumbing, fabrication, installation, and commercial HVAC services. Based in Norwell, MA, the company also specializes in fire protection systems and green building solutions. They serve diverse markets across New England, including education, healthcare, pharmaceutical, and sports & entertainment venues.
Based in Hamilton, NJ, Armistead Mechanical is a full-service mechanical contractor serving industrial and commercial clients throughout the New York/New Jersey area. With over a century of experience, they specialize in mechanical construction, process piping, HVAC, and comprehensive plumbing services, offering innovative solutions and design/build assist.
Based in Alsip, IL, C.J. Erickson Plumbing Co. is a commercial plumbing contractor serving Chicago and its suburbs since 1906. The company specializes in site utility, new construction, and ongoing service and repairs, employing union plumbers, laborers, and operating engineers for various projects.
Based in Houston, TX, Comfort Systems USA is a national service provider specializing in mechanical, electrical, and plumbing building systems. The company delivers comprehensive solutions and services for commercial and industrial construction and facility needs.
Based in Chicago, IL, Gehrett Plumbing Inc. is a family-owned union plumbing contractor with nearly 70 years of experience. They offer professional services to commercial, industrial, educational, and healthcare institutions. The company specializes in complex piping requirements for major buildings across Chicagoland, focusing on quality and efficiency.
Based in Marshfield, MA, Highrise Consolidated Services is a certified Women-Owned Business offering multi-trade subcontracting. They provide union commercial plumbing, painting, and electrical services for pharmaceutical, biotech, healthcare, educational, and institutional facilities across Massachusetts.
L.J. Kruse Company is a Union Plumbing Contractor based in Berkeley, CA. Since 1927, they have provided comprehensive commercial, industrial, and institutional plumbing services, including medical gas installation, radiant heating, underground utilities, seismic upgrades, and water treatment, serving the Bay Area.
e Location:. MSCA "Star" Contractor Mechanical. Reliable Plumbing Services in Monroe and Adrian.
Based in Colorado Springs, CO, Murphy Company is a full-service mechanical contracting firm specializing in plumbing, HVAC, sheet metal, and process piping. With over 100 years of experience, the company provides innovative solutions and state-of-the-art fabrication facilities for complex mechanical systems and offers 24/7 service.
Based in Oklahoma City, OK, PHI Plumbing LLC offers comprehensive plumbing and HVAC repair services. The company is committed to providing quality service with professional staff and affordable rates to customers across Texas, Oklahoma, Arkansas, Kansas, and Missouri.
Tim Ferguson Plumbing, Air & Electric has been voted Best in Jackson for Electrician and Electrical Contractor in the 2025 VIP Jackson Magazine.
101-102, 4957, 101 Volvo St, Monroe, NC 28112.
22935 Burbank Blvd, Woodland Hills, CA 91367.
U.S. Engineering Metalworks LLC Advanced fabrication and work pack processing for piping, plumbing, sheet metal, and multi-trade racks, ensuring quality,
Based in Buena Park, CA, Verne's Plumbing, Inc. provides comprehensive plumbing construction, service, and repair solutions. The company employs over 80 licensed union journeymen and apprentice plumbers, ensuring experienced and certified professionals for commercial and industrial projects across the region.
7909 Philadelphia Rd, Baltimore, MD 21237.
1865 NE Jacksonville Rd, Ocala, FL 34470.
Based in Evansville, IN, DeBra-Kuempel operates as a mechanical, electrical, and plumbing contractor. They provide single-source solutions including engineering, design-build, fabrication, installation, testing, and servicing for mechanical, electrical, plumbing, and industrial piping systems. The company also handles building automation and fire protection equipment.
Based in Norwalk, CT, EMCOR Construction Services (ECS) provides nationwide mechanical, electrical, and fire protection solutions. As a division of EMCOR Group, Inc. ECS delivers comprehensive construction, fabrication, and life safety and security system solutions across virtually all U.S. markets.
EMCOR Mechanical Services provides comprehensive mechanical, automation, and energy solutions across the U.S. and in local markets. Their 5,000+ expert technicians deliver services including plumbing, electrical, HVAC, operations, and maintenance for various facility types. They also assist with refrigerant phasedown compliance.
Based in Buffalo Grove, IL, EMCOR Services Team Mechanical, Inc. provides comprehensive HVAC system solutions, including design, installation, replacement, repair, and maintenance. They also offer installation for chillers, boilers, custom fabrication, industrial and process piping, energy solutions, and equipment rental for commercial and industrial facilities.
EMCOR Services Shambaugh provides integrated mechanical, electrical, and facility maintenance services for commercial and industrial clients across the Midwest. Specializing in design, installation, and upkeep, their trained and certified technicians handle complex projects, including plumbing systems, ensuring high-performance facility operations.
EMCOR Services Fagan provides comprehensive mechanical contracting and maintenance services for commercial, industrial, and institutional projects. The company offers plumbing, HVAC, ammonia and refrigeration, and sheet metal fabrication services. They also specialize in design-build, energy retrofits, and predictive/preventive maintenance solutions.
Great Lakes Plumbing provides comprehensive commercial and residential plumbing, heating, and cooling services. Based in Kalamazoo, MI, the company offers reliable solutions for various property needs. Their experienced team delivers essential mechanical contracting services to clients throughout the greater Kalamazoo area.
Harris Plumbing & Heating offers comprehensive plumbing and heating services for both residential and commercial customers. Based in Brooklyn, NY, the company serves homes and businesses across Brooklyn, Queens, and the Bronx, providing essential repair, maintenance, and installation services.
Based in Fond du Lac, WI, J. F. Ahern Co. provides a comprehensive suite of commercial plumbing services. Their expertise ranges from high-efficiency fixture replacement and drain cleaning to complex industrial water solutions, serving commercial clients with diverse plumbing needs.
Based in Glendale, CA, Moe Plumbing Services offers union-backed plumbing and HVAC services to the greater Los Angeles area. Established in 1927, they provide comprehensive commercial and residential plumbing, heating, and air conditioning solutions.
Based in Union, NJ, Max Sr & Paul Schoenwalder Plumbing, Heating and Air Conditioning, A Corp. provides professional home plumbing, heating, and HVAC services. With over 110 years of experience since 1912, they offer licensed, bonded, and insured master plumbers for residential needs, including same-day emergency service.
Southland Industries is an MEP building systems expert providing comprehensive solutions from design through building maintenance. They optimize the design, construction, operation, and efficiency of various built environments, offering full lifecycle expertise through collaboration and innovation.
Based in Union, NJ, Union County Plumbing and Heating is an owner-run specialist for heating and plumbing services. They offer boiler repair and installation, water heater services, heating system repairs, and oil-to-gas conversions. The company also provides 24/7 emergency plumbing services.
Based in Delaware County, PA, Union Plumbing & HVAC provides professional plumbing and HVAC services. The company offers estimates and operates daily, demonstrating a commitment to accessible and reliable service for residential and commercial clients requiring union-affiliated contracting work.
Based in Aurora, IL, AMS Industries, Inc. is a full-service design-build contractor specializing in food and beverage processing systems. They provide comprehensive services including process piping, equipment installation, and utility piping and plumbing. The company partners with various union trades, including pipefitters and plumbers, for integrated project delivery.
Jackson Mechanical is a union mechanical contractor based in Oklahoma City, OK, specializing in comprehensive plumbing, HVAC, sheet metal, and pipefitting services. Serving commercial, industrial, and institutional clients, the company employs skilled tradesmen represented by local Plumbers & Pipefitters and Sheet Metal Workers unions.
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| Type | Best For | Typical MOQ |
|---|---|---|
| Large Commercial/Industrial | Multi-story commercial buildings, large-scale industrial complexes, critical infrastructure, projects requiring extensive BIM coordination and prefabrication. | Projects valued >$500k |
| Mid-size Institutional/Design-Build | Hospitals, schools, government facilities, projects benefiting from integrated design-build plumbing solutions, or those with specific medical gas or lab piping needs. | Projects valued $100k - $1M |
| Specialized Systems & Maintenance | Projects primarily focused on medical gas systems, cleanroom piping, process piping, or ongoing facility service call agreements and preventative maintenance. | Varies; often includes retainer for service contracts or project values from $20k |
| Regional Commercial/Multi-family | New construction of multi-family residential complexes, smaller commercial tenant improvements, or local retail development projects. | Projects valued $50k - $500k |
Prevailing wage significantly influences bids for union plumbing contractors, especially on public works or government-funded projects. It mandates that contractors pay their employees a specific minimum hourly wage (including benefits) determined by the Department of Labor for each trade in a particular geographic area. This means the labor component of bids will generally be higher and more standardized across compliant union contractors, shifting the competitive focus to efficiency, project management, and material costs rather than just labor rate arbitrage.
The most effective way is to directly contact the relevant Plumbers & Pipefitters Local union hall in the project's jurisdiction. You can ask for confirmation of the contractor's signatory status, their good standing, and any specific endorsements or specialty certifications (e.g., medical gas endorsement) held by their journeyman plumbers and apprentices. Many locals also have online directories or can provide references for contractors within their jurisdiction.
Yes, many union plumbing contractors are equipped for both, but it's crucial to verify their specific expertise. While most can handle standard commercial plumbing, specialized systems like medical gas, pure water loops, or process piping for laboratories require additional certifications (e.g., NFPA 99 for medical gas, specific brazing qualifications) and a proven track record. Always request to see specific project experience and individual plumber certifications for these high-stakes installations, as not all union shops have the same depth of specialization.
Union apprenticeship programs are a cornerstone of workforce development, ensuring a consistent supply of highly trained plumbers. These multi-year programs combine rigorous classroom instruction with on-the-job training under experienced journeyman plumbers. For project staffing, it means contractors have access to a pool of skilled labor that meets standardized training requirements. This positively impacts labor quality, consistency, and adherence to best practices, though it also implies a structured wage scale and sometimes specific apprentice-to-journeyman ratios on projects.
A union plumbing contractor often brings a more formalized approach to labor relations and workforce stability. They typically have access to a large, consistent pool of pre-qualified, highly trained journeyman plumbers and apprentices through the union hall, reducing risks associated with labor shortages or inconsistent skill levels. Project management often includes strict adherence to collective bargaining agreements, detailed safety protocols that are frequently more robust due to union emphasis, and potentially smoother coordination with other union trades on large, complex projects, leading to more predictable labor costs and schedules, especially on prevailing wage jobs.