

Proudly serving The Northland since 1934
Trusted Professionals
For the past 80 years A.G. O’Brien has led the Northland in providing the highest quality services in both Residential & Commercial Plumbing, HVAC, and Fire Protection.
We pride ourselves in doing work that is second to none, and our portfolio includes projects for the area’s biggest businesses and community leaders.
Our Service Areas
Saint Louis County
Douglas County
Carlton County
Pine County
Itasca County
Cook County
Bayfield County
