Editorial standards

AI use disclosure

City pages are drafted with AI (Claude Sonnet 4.6), reviewed by our editorial team, and published only after passing uniqueness and factual-accuracy checks. One in every ten pages receives full human review.

Sourcing

• Plumber licensing: Minnesota Department of Labor and Industry (DLI) — master plumber, journeyworker, and plumbing contractor records.
• Insurance and consumer guidance: Minnesota Department of Commerce (insurance division).
• Climate and cold-snap data: NWS Twin Cities (Chanhassen), NWS Duluth, and Minnesota State Climatology Office.
• Frost depth, winterization, and pipe-protection guidance: University of Minnesota Extension.
• City populations: US Census Bureau (2020).
• Cost data: aggregated from HomeAdvisor, Angi, and PHCC industry surveys for the Upper Midwest.

Corrections

Factual errors: email corrections@mnfrozenpipe.com. We investigate within 7 business days.

What we do not do

• Do not publish fake reviews or fabricated business profiles.
• Do not claim DLI plumber licenses we do not hold (we are a referral directory).
• Do not perform plumbing work — work is by independent DLI-licensed plumbers.
• Do not provide plumbing-code interpretation. Minnesota Plumbing Code (MN Rules Ch. 4714) and local AHJ amendments vary; always defer to the local authority having jurisdiction.