Monona Underground
Monona Underground, a division of Monona Plumbing and Fire Protection, is a trusted underground utility contractor with over 30 years of proven experience. We specialize in the estimation, installation, and repair of underground utility systems of all sizes and complexities, including sanitary sewer, storm sewer, and watermain infrastructure.
Our experienced project managers, estimators, and field crews deliver precise, code-compliant solutions tailored to each project’s scope and site conditions. From preconstruction planning through final installation, Monona Underground provides reliable, efficient, and cost-effective utility construction services for municipal, commercial, industrial, and residential clients throughout Southern Wisconsin.
We maintain a comprehensive fleet of light- and heavy-duty equipment—including excavators, dozers, loaders, and skid steers—allowing us to self-perform critical work, maintain tight schedules, and control quality on every job.
Beyond new construction, Monona Underground offers rapid-response underground utility repair services, including same-day service when available. For critical situations, our emergency response team is available 24 hours a day, 7 days a week, 365 days a year, ensuring minimal downtime and reduced risk to property and infrastructure.
Our Services
Municipal Reconstruction
Monona Underground works closely with municipalities and public agencies across Southern Wisconsin to reconstruct, replace, and upgrade aging or undersized underground utility systems. Our team delivers durable, long-term solutions that improve system performance, increase capacity, and meet current regulatory standards.
New Developments and Subdivisions
We provide complete underground utility installation for new developments and subdivisions, delivering fully integrated sanitary sewer, storm sewer, and watermain systems. Our expertise ensures efficient construction, proper coordination, and seamless integration with future site development.
Site Utilities
Our comprehensive site utility services include:
- Installation of sanitary sewer, storm sewer, and watermain systems
- Aggregate grading for roadways, parking lots, and sidewalks
- Mass earthwork and fine grading for landscaping and pond construction
Private and Public Repairs
When underground utility failures occur, Monona Underground responds quickly with proven repair solutions. Our team handles collapsed sanitary sewer lines, leaking or failed water services, storm sewer pipe failures, and structural damage to underground systems. Whether residential, commercial, or municipal, we deliver fast, reliable repairs that restore service and protect surrounding infrastructure.
Past Projects
Our Past Projects section showcases a selection of completed projects, featuring project photography and detailed overviews. Each project page includes progress photos and concise explanations outlining the scope of work, construction methods, and key milestones achieved throughout the project lifecycle.
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