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What Are the Risks of Mold in a School or Daycare?

Last updated October 23, 2026

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The short answer

Health Risks for Vulnerable Occupants

Children are especially sensitive to mold because their immune and respiratory systems are still developing. Exposure can cause immediate allergic reactions, such as sneezing, runny nose, and skin rashes. For those with asthma or other conditions, mold spores can trigger more severe attacks, leading to wheezing and difficulty breathing.

Adults in the building, including teachers and custodians, can also experience symptoms from ongoing exposure. Common issues for adults may include persistent headaches, fatigue, and sinus congestion. Anyone feeling unwell in that environment should consider consulting a doctor to discuss potential causes.

Common Sources of Moisture in Educational Buildings

Moisture is the fundamental requirement for mold growth. In schools and daycares, this often comes from leaky roofs, windows, or plumbing systems. A small, slow pipe leak inside a wall or under a sink can create a hidden, persistent damp area perfect for mold to establish itself unnoticed.

Daily activities also contribute to high humidity. Frequent cleaning, cooking in cafeterias, and even the breath of many occupants in a classroom can raise moisture levels. Without proper ventilation, this humid air condenses on cooler surfaces like windowsills or exterior walls, creating a damp environment.

  • Leaky roofs or windows during rain.
  • Condensation on cold pipes and walls.
  • Plumbing leaks from drinking fountains, sinks, or toilets.
  • Spills and moisture from art projects or activities.
  • Poor ventilation in bathrooms, kitchens, or laundry areas.
  • Water intrusion from flooding or foundation issues.

How to Identify a Potential Mold Problem

Visible signs are the most obvious indicator. Look for discolored patches on walls, ceilings, or around windows. These can appear in various colors, including black, green, or white, and may have a fuzzy or slimy texture. Pay special attention to areas behind furniture, inside closets, or under carpets where airflow is limited.

A persistent musty, earthy odor is a strong clue, even if you cannot see the source. This smell often indicates hidden mold growth within wall cavities, under flooring, or in ceiling tiles. Physical symptoms like increased allergy complaints among a group of children in one room can also point to a localized air quality issue.

Steps for School Administrators and Parents

If you suspect mold, the first step is to identify and stop the moisture source. This might mean shutting off water to a leaking fixture or placing a bucket under a roof drip. Do not attempt to clean large areas of mold yourself, as improper cleaning can disperse more spores and potentially expose you to harmful compounds.

Document the issue with clear photos and notes about the location and any related water damage. Report the concern to the building manager or maintenance department in writing. For significant problems, a professional assessment is needed to determine the full extent and create a safe remediation plan.

Professional Assessment and Remediation

Qualified mold professionals use tools like moisture meters and infrared cameras to find hidden moisture and map the extent of growth. They take air and surface samples to identify the types of mold present, which helps in planning the appropriate response. Their assessment provides a clear picture of the problem's scope.

Remediation involves containing the affected area to prevent spore spread, safely removing contaminated materials like drywall or insulation, and thoroughly cleaning salvageable surfaces. The final and most critical step is drying the structure completely and fixing the original water leak to ensure the mold does not return. Policies vary, and your insurer decides what is covered for such work.

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Frequently asked questions

Who should test for mold in a school?

Testing should be conducted by a qualified, independent mold inspector or industrial hygienist. They have the proper equipment and training to assess the type and extent of growth safely. It is not recommended for school personnel to collect samples, as improper methods can lead to inaccurate results.

Can a classroom with mold be used?

If mold is visible or suspected in a classroom, it is often safest to relocate occupants until a professional assessment is complete. Using the space could expose people to airborne spores, potentially worsening health symptoms. The area should be closed off to help contain the issue.

How can schools prevent mold growth?

Prevention focuses on moisture control. Maintain HVAC systems for good ventilation, promptly repair all leaks, and ensure roofs and windows are sealed. Use dehumidifiers in naturally damp areas like basements. Regularly inspect common problem spots, such as around sinks and under windows, for early signs of water.

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