Flooding & Water Damage

Water-related damage affects millions of homes around the world every year. The origins of these problems are multiple:

  • Flooding due to a natural disaster (river overflows, mudflows, etc.).
  • Leakage of water supply pipe
  • Leakage from a water drainage pipe
  • Failure of equipment such as a washing machine or dishwasher
  • Roof leakage defect
  • Capillary rise
  • Condensation
  • Poor ventilation


As a result of population growth, many buildings are being constructed in flood-prone areas, and the increased density of buildings promotes flooding because the water is no longer naturally absorbed by the soil.

In the long term, global warming could amplify these phenomena and result in an increase in flooding and the number of buildings affected.

How can water damage affect indoor air quality?

Moisture in the affected materials creates the conditions for molds growth.

According to a 2006 INSEE survey of 40,000 households in France, the presence of mold stains is reported in 23% of dwellings

This usually results in stains on walls and materials and a characteristic musty odor. However, the traces of molds are not always visible (behind wallpaper, furniture, under carpeting or parquet flooring).

In addition, sludge from flooding contains a large number of pathogenic molds that will multiply inside buildings. It is these microorganisms that will pollute the indoor air.

What are the health risks of mould exposure?

Moulds are microscopic fungi that are potentially very toxic to humans: by producing highly allergenic substances, pathogenic spores that can colonize the lungs (aspergillosis) and toxins (mycotoxins).

Breathing mold-polluted air is a health hazard."

How is indoor air pollution by mould measured?

As moulds grow, they disperse spores into the air to conquer new surfaces. These spores are present in dust.

Laboratory analysis of a dust sample allows the level of fungal contamination to be accurately measured. In addition, the analysis can identify the genus, species and quantity of each mould present.

When to measure the presence of molds following water damage?

After water damage, it is important to check that the level of fungal pollution does not pose a health risk to the occupants. If the level of pollution is too high, it is recommended that you temporarily change your residence.

After cleaning and renovation work, measuring the molds pollution makes it possible to check that there is no health risk and to certify that the work has been carried out correctly.

You can ask the insurance company that covers your home to cover these tests.

Contact YOOTEST to receive a letter requesting coverage.