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

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