Is Chicagoland’s premier utility contractor and a Minority Business Enterprise that holds certifications with the City of Chicago and the State of Illinois. Since our incorporation in April 2005, Sonoma Underground has grown to cover all aspects of utility construction. From river crossings and trenching within the crowded streets of Chicago to open field trenching and boring, Sonoma Underground has the skills to get your job done right. Complete turnkey services and individual project components are what Sonoma Underground offers for your OSP project needs. Our client base includes the private sector, municipalities, the State of Illinois, Military Affairs, utility companies as well as government contracts.

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