Corrigan CO

Founded in 1896, Corrigan CO Company has evolved from a small St. Louis plumbing shop into one of the largest full-service mechanical contracting firms in the United States. Our ISO 9001-certified operations combine time-tested methodologies with innovative approaches, delivering complex mechanical systems for industrial, institutional, commercial, nuclear, power, and wastewater treatment sectors nationwide. With the largest pipe fabrication facility in St. Louis, we leverage in-house capabilities to enhance efficiency, quality, and cost-effectiveness across HVAC, plumbing, industrial piping, sheet metal, and emergency services. Our commitment to lean construction principles and early project engagement enables optimized planning, precision engineering, and seamless execution. Safety remains our highest priority, reflected in our industry-leading safety record and rigorous compliance with OSHA, MSHA, and EPA standards. Backed by three generations of expertise, we maintain a customer-focused approach that prioritizes listening, problem-solving, and delivering reliable solutions that meet exacting specifications.

Our union craftsmen, recognized as the best in the business, are supported by advanced 3D design systems and state-of-the-art fabrication technologies. From high-purity welding to modular system assembly, we ensure every project component meets exacting quality benchmarks. Our collaborative model fosters shared success through pre-planning, risk management, and value engineering at every project stage. With 90% of process piping contracts coming from repeat clients, our reputation for excellence spans automotive, beverage, chemical, energy, food processing, pharmaceutical, and municipal service industries. Our Corrigan CO Company Success Model guarantees timely delivery and budget adherence while maintaining uncompromising safety standards for our workforce and clients.