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Dont Miss Out Check Upcoming Events Dont Miss Out Check Upcoming Events About Us Plumbers and Steamfitters Local Union 33 has proudly served the plumbing and mechanical construction and service industry for over 130 years. With the expertise necessary to complete projects safely and on schedule the highly skilled members of Local 33 provide quality craftsmanship throughout central and western Iowa. Our productive workforce of 1650 plumbers steamfitters welders and HVACrefrigeration technicians are highlytrained and ready to work on multifamily housing commercial and industrial facilities as well as process piping. If youre a contractor in our jurisdiction we can supply the manpower to meet your needs in plumbing heating air conditioning controls medical gas high purity piping valve repair water treatment and other specialties.