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Des Moines, Iowa mold guide

Mold Guide for Des Moines, Iowa

Local mold risk drivers, seasonal priorities, and next steps for homeowners and renters in Des Moines.

State law data last updated: 2026-02-08

Overview

With 36.5 inches of annual rainfall and an average temperature of 50.9 F, Des Moines a mix of wet spells experiences and dry breaks.

Because Iowa experiences a range of climate conditions, statewide humidity trends and storm patterns also influence indoor moisture levels.

Des Moines has a four season climate with cold winters and warm, humid summers, so moisture risk shifts between snowmelt and summer humidity.

Des Moines Neighborhood Inspection Division handles rental inspections, nuisance abatement, and property condition concerns.

Des Moines Neighborhood Inspection Division handles rental inspections, nuisance abatements, and code violations.

This guide highlights local moisture drivers, seasonal risk, and prevention steps. For legal rights and landlord obligations, review the Iowa mold laws guide.

Sources: [Iowa Climate | Britannica] | [Des Moines Neighborhood Inspection Division] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Action Checklist

Get free access to the full guide

8-step checklist for immediate action

Des Moines Home Inspection Checklist

Common construction types in Des Moines affect where moisture problems develop. Here is how local building patterns shape what to inspect.

In Des Moines, des Moines Neighborhood Inspection Division provides inspection and enforcement for property conditions.

Documenting moisture damage helps support follow up inspections.

Des Moines Neighborhood Inspection Division handles rental inspections, nuisance abatements, and code violations.

Sources: [Des Moines Neighborhood Inspection Division]

  • With about 36.5 inches of annual rainfall, Des Moines homes benefit from routine gutter cleaning and roof drainage checks.
  • Attic insulation and roof flashing after snow.
  • Basement walls and sump pump pits.
  • Window frames and sills with condensation.
  • Bathroom fans and vent ducts.
  • Laundry hoses and floor drains.
  • Water heater pans and overflow lines.
  • Kitchen cabinet bases around plumbing.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Warning Signs of Mold in Des Moines

Watch for these signs that moisture is lingering in Des Moines homes and rentals:

  • Persistent window condensation in Des Moines (annual average 50.9 F) is a common early indicator that indoor humidity is too high.
  • Condensation that returns on windows each morning.
  • Musty odors in basements or closets.
  • Peeling paint near baseboards or window trim.
  • Dark spotting near ceiling corners.
  • Soft drywall around tubs or showers.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Mold Risk Factors in Des Moines

These are the most common moisture drivers for homes and rentals in Des Moines:

  • At about 36.5 inches of rain per year, Des Moines storm events and small leaks both matter.
  • Snow and ice create roof edge leaks during freeze thaw cycles.
  • Spring rain and snowmelt can dampen basements.
  • Summer humidity slows drying after leaks.
  • Condensation builds on windows during cold nights.
  • Plumbing leaks can linger in utility rooms.

Sources: [Iowa Climate | Britannica] | [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Des Moines Seasonal Risk Calendar

Winter

Extended heating with an average of 50.9 F creates condensation risk on cold windows and walls. Maintain steady ventilation.

Spring

Rain and snowmelt can dampen basements. Check sump pumps.

Summer

Cool summers still bring rain. Inspect roof edges after storms.

Fall

Cooling temperatures bring condensation in tight homes.

Sources: [Iowa Climate | Britannica] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Des Moines Moisture Playbook

Use this short playbook to stay ahead of common moisture problems in Des Moines.

After a Leak

Stop the source, remove wet materials, and dry the area within 24 to 48 hours.

Monthly Maintenance

Check under sinks, clear condensate lines, and monitor indoor humidity.

Seasonal Tune Up

Before storm season, clear gutters and inspect flashing; about 36.5 inches of annual precipitation means small leaks can add up.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Mold Prevention in Des Moines

Use these priorities to keep indoor humidity low and avoid recurring growth:

  • Gutters and downspouts need regular clearing to handle 36.5 inches of yearly precipitation and keep water away from the foundation.
  • Maintain indoor humidity between 30 and 50 percent.
  • Dry wet materials within 24 to 48 hours.
  • Vent bathrooms and kitchens outdoors.
  • Inspect roof flashing and gutters before winter.
  • Check basements after snowmelt and heavy rain.
  • Service HVAC condensate drains annually.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - DES MOINES INTL AP, IA US]

Local Regulations

Some cities in Iowa publish additional housing rules or enforcement guidance that can affect mold complaints.

Local regulations are available with the Mold Toolkit

1 city-specific regulations

State Laws and Rights

Iowa mold law snapshot

Iowa does not have a mold-specific statute, but habitability rules still apply.

Under Iowa Code Section 562A.15, landlords must comply with applicable building and housing codes materially affecting health and safety, make all repairs and do whatever is necessary to put and keep the premises in a fit and habitable condition, keep all common areas clean and safe, and maintain all electrical, plumbing, sanitary, heating, ventilating, air-conditioning, and other facilities in good and safe working order. Iowa courts have recognized an implied warranty of habitability in all residential leases, whether oral or written. This warranty requires that the premises be safe and sanitary for habitation. A breach must be of such substantial nature that the premises are unsafe or unsanitary and unfit for habitation.

Use the full Iowa guide for tenant rights, landlord responsibilities, and remedies.

Frequently Asked Questions

What are the first signs of mold in a Des Moines home?
Musty odors, condensation on windows, peeling paint, and dark spots near vents or ceilings are common early signs. If symptoms persist after cleaning, schedule an inspection.
When should I hire a mold professional in Des Moines?
If the affected area is larger than about 10 square feet, if growth returns after cleaning, or if anyone has health symptoms, hire a pro. Use the DIY vs pro guide to decide.
How does winter condensation lead to mold in Des Moines?
Warm indoor air meeting cold surfaces creates condensation on windows and in attics. Run exhaust fans and check for wet insulation. Review prevention strategies.
Do ice dams cause mold in Des Moines homes?
Ice dams trap snowmelt on roofs, which can seep into attics and walls. Proper attic ventilation and insulation help prevent them. See attic mold prevention.
Do temperature swings in Des Moines cause mold?
Large temperature changes can cause condensation in attics and crawl spaces. Seal penetrations and maintain balanced airflow. See our attic mold guide.
How fast does mold grow after a leak in Des Moines?
Mold can start growing within 24 to 48 hours if materials stay wet. Quick drying is critical. See our prevention guide for response steps.