US · FMCSA ACTIVE
CAPITOL UNDERGROUND INC
Sun Prairie, WI 53590 · DOT 901060
Company profile
Web-discovered · as of 2026-07-30
Sun Prairie, Wisconsin-based utility and public works contractor specializing in sewer, water, and excavation services, serving developers and municipalities.
Fleet use
Specialized service
Operating scope
Regional
Service model
own account
Equipment
dump, specialized
Ownership
Private
Employees
11-50
Networks & associations
AGC of Wisconsin
Industries served
public works constructionsewer installationwater installationexcavation
HQ · 2831 Capitol Dr, Sun Prairie, WI 53590
Active site and 2026 fleet data show active operations
Registry record
Source FMCSA · as of 2026-07-08
Fleet size
31
power units
Activity
road freight carrier
private licence
In operation since
2000
25 drivers
Data Services
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