Here you'll find Southern Wisconsin's most complete source of information on plumbing and the plumbing trade. Our members, who include Union Plumbers and Plumbing Contractors, take pride in providing the highest level of craftsmanship and integrity in the industry. We have created this site to provide you with all the tools you need to make informed decisions regarding your residential and commercial plumbing projects. The members of Professional Plumbing Contractors (PPC) are professional, licensed wisconsin plumbers serving customers throughout the Milwaukee, Madison and Janesville areas.