Minneapolis Plumbing: Licensing, Permits & Water

The state Department of Labor and Industry licenses the trade across Minnesota, and Minneapolis adds a focused second layer: a city Plumbing License for contractors working on connections with branch sewers, drains, main sewers, water mains and water pipes, built on the state's twenty-five-thousand-dollar bond form, sometimes a competency card, and published as a live directory of license holders. Contractors holding the city license, once pre-approved, also unlock Express Limited Permits, the fast lane for small jobs on existing homes.

• Authority. Minnesota Department of Labor and Industry (statewide plumber and plumbing-contractor licensing) plus a City of Minneapolis Plumbing License for contractors, issued by Business Licenses & Consumer Services
• Structure. The state licenses the trade; the city separately licenses contractors working on connections with branch sewers, drains, main sewers, water mains and water pipes, with an application built on the state's twenty-five-thousand-dollar bond form, a possible competency card, and a public city roster of who holds the license
• Worth knowing. Minneapolis publishes its own directory of plumbing contractors holding the city license. It is a second check homeowners can run beyond the state license, and the pool from which Express Limited Permit users come.

Checked against the official source, September 2026: www.minneapolismn.gov.

Owner-occupants of anything up to a fourplex may permit their own work (a person with photo ID, never an LLC), and single-family owners may do their own plumbing with exactly one carve-out: gas-fired heating equipment is off limits. The permit list runs from fixtures and water piping to heaters and gas appliance connections, while the exempt list for small homes (disposals, dishwashers, internal fixture parts, leak repairs) holds only while the actual supply line and piping system stay untouched.

• Permit office. Minneapolis Development Review (CPED), Public Service Building, 505 Fourth Ave. S.; permits online, with 311 as the front door
• Homeowner rule. Yes, for owner-occupants of one-to-four-unit homes: individuals who own and live in a unit may permit their own work (photo ID required; corporations, LLCs and partnerships may not self-apply), and single-family owners may do their own plumbing with one explicit exclusion, no work on gas-fired heating equipment. Rentals use credentialed contractors.
• Process. Permits are required to replace or install fixtures, water piping, a water heater, a non-testable backflow preventer or gas appliance connections; the exempt list for one- and two-family homes (clean-out plugs, dishwashers, disposals, internal fixture parts, leak repairs) holds only while conditions stay sanitary and the water supply line and piping system stay untouched.

Checked against the official source, September 2026: www.minneapolismn.gov.

The Water Works' monthly plant analyses tell the story in one line: total hardness around 100 ppm, 5.8 grains in the January 2026 report and 5.4 in June 2026, from river water that would run far harder without the lime softening that pulls sixty-five thousand pounds of minerals out daily. The 94 mg/L on the Minnesota page is the utility's published 2025 annual average, inside an 80 to 113 ppm range. The lead program is generous and urgent at once: replacements at no cost to owners with over 1,800 planned for 2026, service lines the owner legally owns, and pre-1930 homes the likeliest to carry lead. Minnesota wants every line replaced by 2033, four years ahead of the federal date.

• Utility. Minneapolis Water Works (City of Minneapolis Public Works)
• Supply source. The Mississippi River, about 21 billion gallons a year, treated and lime-softened at the Fridley plant and the Columbia Heights ultrafiltration facility
• Hardness. 94 mg/L (≈5.5 gpg), moderately hard; utility annual analysis, 80-113 ppm range, 2025 average 94, 2025

Utility information: www.minneapolismn.gov. The hardness figure is the same record shown on the Minnesota page.

• Drain Cleaning
• Water Heater Repair

  Minneapolis lime-softens at the plant, so delivered water runs 5-6 grains and heaters scale moderately despite the river source.

• Sewer Line Repair

  Contractors on sewer and water-main connections carry the city's own Plumbing License on top of the state credential, so check the city's published roster.

• Septic Tank Pumping
• Leak Detection & Repair

  Lead service lines are being replaced at no cost to owners, with over 1,800 planned in 2026 and pre-1930 homes the likeliest candidates.

• All services →

This page explains how plumbing is regulated in Minneapolis; it is not a provider directory. For the job itself, describe the problem and your ZIP: a license-checked plumber who covers Minneapolis gets the details and contacts you with next steps and a quote.