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Mold Remediation in Minneapolis, MN
Twin Cities dew points have reached 82 degrees and mean annual relative humidity runs 68 percent — damp enough that basements and wall cavities stay wet long after a leak. One call reaches vetted local mold-remediation pros.
Recent floods · Minneapolis
No recent flood events near Minneapolis — see the live board.
Mold in Minneapolis follows water: the area averages 30.6 inches of precipitation a year, and 7 of its 18 federal disaster declarations were floods, most recently the severe storms and flooding of 2016. Runoff moves through a drainage network of almost 29,000 storm drain inlets and 509 miles of storm pipe, and when that water backs up into a basement, the damp wall cavities and finish materials left behind are what mold colonizes.
Mold risk in Minneapolis
30.6"
average annual precipitation (NOAA)
72%
of Hennepin County's 18 declared disasters were floods, hurricanes or storms (FEMA)
54.4"
average annual snowfall — the ice-dam and condensation season (NOAA)
Sources: FEMA OpenFEMA — federally-declared disaster history (county FIPS 27053) · NOAA NCEI — 1991–2020 Climate Normals (MINNEAPOLIS ST PAUL INTERNATIONAL AIRPORT, MN US)
What makes Minneapolis a mold-prone city
Moisture arrives in two seasons here, and the second one is the surprise. Warm-season storms are frequent — the airport climate normals record 36.1 days with thunderstorms a year — and the Minnesota Department of Health advises keeping indoor relative humidity below 60 percent outside winter, a threshold that humid-July basements and closed wall cavities routinely miss.
Winter shifts the mechanism rather than removing it. Snowfall normals run 54.4 inches a season, and attic air leaks melt the underside of that snowpack until the runoff refreezes at the eaves; the resulting ice dam backs water under the shingles and into ceilings and walls, wetting insulation and framing out of sight. The state's indoor humidity target drops to 20 to 40 percent in winter for a related reason — warm indoor air carrying moisture into cold assemblies condenses there.
Neither Minnesota nor any federal agency licenses or certifies mold investigators or remediators, so judging a firm's competence falls to the property owner, and a seller must disclose known material facts that could significantly affect a buyer's use of the property. Health officials put the drying window at 24 to 48 hours after materials get wet, which makes the decisive question after any leak or flood how quickly a qualified crew gets the assembly dry — the mold remediation guide covers what that work involves.
Mold remediation rules & licensing
Mold work here is governed by property-maintenance standards rather than by a remediator license. Minnesota licenses no mold inspectors or remediators, and the state health department provides neither inspections nor testing, so credentials are voluntary and vetting falls to the property owner. What binds instead is the housing maintenance code: an ordinance dated June 15, 2023 added mold language to Chapter 244 of the Minneapolis code, requiring interior and exterior surfaces to show no visible mold growth or chronic or persistent excessive dampness, requiring material discolored or odorous from mold to be cleaned, dried and repaired, and requiring the underlying moisture cause to be investigated and corrected.
| Permit / inspection | When it applies |
|---|---|
| Minneapolis Code of Ordinances § 244.510(d) — Interior | City level. Interior surfaces and coverings — carpet, wood, cellulose insulation, paper, paint and paper-faced gypsum board — must show no signs of visible mold growth or chronic or persistent excessive dampness or moisture. Material discolored or deteriorated by mold or mildew, or causing a moldy or earthy odor, must be cleaned, dried and repaired; structurally unsound material must be removed and replaced; and the underlying cause of the dampness or odor must be investigated and corrected. Added by Ord. No. 2023-045, § 2, dated 6-15-23. Sits in Article VI, Maintenance by Owner. |
| Minneapolis Code of Ordinances § 244.500(a) — Foundations, roofs, exterior walls and surfaces | City level. The same 2023 ordinance (Ord. No. 2023-045, § 1, dated 6-15-23) carried the standard outward: exterior surfaces and surface coverings, including wood, cellulose insulation, paper, paint and paper-faced gypsum board, must show no signs of visible mold growth or chronic or persistent excessive dampness or moisture. The section also requires every exterior wall, chimney, foundation and roof to be reasonably weathertight and watertight, which is the standard behind exterior moisture-source repairs that accompany interior remediation. |
| Minnesota Department of Health — Mold and Moisture (no state licensing or certification) | State level, and the operative baseline because the city adds no remediator license of its own. Neither the state nor any federal agency licenses or certifies mold investigators or remediators, so any certification a firm holds is voluntary. The department provides no inspection or testing services, and it does not recommend testing before treatment: there is no standardized level for how much mold is safe, so visible growth or odor is itself the signal to act. |
| Minnesota Department of Labor and Industry — Residential Building Contractor / Remodeler License (Minn. Stat. § 326B.805) | State level, and the license that most often applies to remediation and rebuild work in the city. A person contracting directly with a homeowner and offering more than one special skill must hold a residential building contractor or remodeler license. Specialty contractors providing only one special skill are exempt, as are persons whose annual gross receipts for specialty work do not exceed $15,000 and who obtain a certificate of exemption by filing an annual affidavit. |
| Minnesota Department of Health — Mold in Rental Housing (enforcement route) | State level guidance pointing to local enforcement. The department states it does not provide direct services such as inspections or testing for mold problems, and directs tenants to contact their city or county for available codes and inspection services. It notes that some local health departments may apply their authority under state law to declare a property a public health nuisance and issue correction orders to the landlord. |
Mold disclosure & remediation standards
- Minn. Stat. § 513.55 — General Disclosure Requirements
- State level. Before signing a purchase agreement, a seller of residential property must disclose in writing all material facts known to the seller that could adversely and significantly affect an ordinary buyer's use and enjoyment of the property. Past water intrusion and known mold growth fall under this good-faith standard, which is measured by what the seller actually knew at the time.
- Minn. Stat. § 504B.161 — Covenants of Landlord or Licensor
- State level. Every residential lease carries non-waivable covenants that the premises and common areas are fit for the intended use, are kept in reasonable repair, and comply with applicable federal, state and local health and safety laws. A landlord cannot contract out of these duties, and the local maintenance code the city enforces is one of the health and safety laws referenced.
- Minn. Stat. § 504B.381 — Emergency Tenant Remedies Action
- State level. A tenant may file a verified petition in district court when a government body has condemned the unit or declared it unfit, or when conditions pose a serious and negative impact on health or safety. The tenant must try to notify the landlord at least 24 hours before filing. A court finding a violation orders the landlord to begin remedying it immediately.
- Minn. Stat. § 504B.385 — Rent Escrow Action
- State level. Where an inspector has issued a written code-violation notice and the repair period has lapsed, or where the tenant gave the landlord written notice and 14 days passed without correction, the tenant may deposit rent with the court administrator. The court may order rent abatement, release escrowed rent to fund repairs, or require continued deposits until the work is done.
Local mold notes
- Rental License Tiers — City of Minneapolis Regulatory Services — Housing code violations from the past two years score a rental property across 11 factors and set its license tier: 0-19 points is Tier 1, 20-39 is Tier 2, and 40 or more is Tier 3. The tier fixes the routine inspection cycle — Tier 1 every eight years, Tier 2 every five years, Tier 3 annually. Violations documented as having an urgent impact on renter safety and habitability carry higher point values, so unresolved dampness or mold findings can move a building onto a shorter inspection cycle. Tier 1D is a default designation for properties not routinely inspected in over five years.
- Asthma Home Visit Program — Minneapolis Health Department, Healthy Homes — The city Health Department offers free home inspections for families with children under the age of 21 to identify and reduce sources of asthma triggers, and the program lists mold among the contributing factors it assesses. Healthy Home Specialists conduct the visits, and free products may be delivered, including HEPA air cleaners, vacuums, allergen pillows and mattress covers. Households in North and Northeast neighborhoods may also qualify for pest control for mice or cockroaches. The program assesses triggers and provides education; it does not perform remediation.
- 311 Property Complaint Dashboard — City of Minneapolis — Regulatory Services publishes a dashboard of housing and commercial complaints from the past year, organized by property address and showing each complaint's status as waiting for follow up, no issues found, or found issues to be fixed. Entries link through to all violations issued at that property from complaints and other inspections. For a renter or buyer weighing a property's moisture history, it is a public record of whether earlier complaints at an address were resolved or left open. The page records a last update of June 30, 2026.
- Rental Unit Issue reporting — Minneapolis 311 — A renter reporting mold or dampness files through 311, which asks for the address, a description of the issue, and information on what has already been done to ask the landlord or property manager to fix it. An inspector then visits to determine whether the condition violates housing code; where it does, the inspector sends a letter to the property owner or manager stating what must be corrected. Intake runs 7 a.m. to 7 p.m., Monday through Friday.
Cleanup & recovery services nearby
- Bratt Tree Company — Family-owned tree service with an office at 2423 E 26th St and ISA Certified Arborists on staff — storm-damage tree removal, cabling and bracing, and stump grinding after wind and ice bring limbs down on roofs and service lines.
- Curbside Waste — Roll-off dumpster rental from 10 to 40 cubic yards, delivered across the metro — the container that holds soaked drywall, carpet pad and subfloor pulled out during a flooded-basement tear-out.
- Junk Genius — Junk hauling company at 2906 E 49th St — yard and storm debris, renovation debris, appliance and electronics recycling, and crawl-space or storage-unit cleanouts, priced by the truck space used.
- North Star Mini Storage — Eight Twin Cities self-storage locations including one at 35W and Lake Street, with climate-controlled units — somewhere dry to hold furniture and boxes while a lower level is dried and rebuilt.
- Citi-Cargo & Storage — Portable storage containers delivered on site from a base at 900 Apollo Road in Eagan — keeps salvaged contents in the driveway and accessible rather than trucked to a warehouse across the metro.
- Glass Doctor of Minneapolis — Locally owned and operated glass shop running 24/7 emergency service — boards up the opening when a custom pane has to be ordered, and sweeps the broken glass before the frame and casing are repaired.
By the numbers
- Mean annual relative humidity (KMSP, 1991-2020 normals) — The normal rises to 73 percent at hour 00 LST, the overnight window when unconditioned basements run closest to condensation.
- 68%
- Annual stormwater rate per Equivalent Stormwater Unit — One ESU equals 1,530 square feet of impervious surface, so a property's bill scales with roof and paving area.
- $16.35