Mould in the Workplace: A Basic Guide

How to recognize mould, clean it up and prevent its growth.

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Designed and written as a practical workplace training and reference tool. This 125-page pocket guide is filled with clear-language text including safety tips, charts, diagrams, checklists and illustrations.


This guide will enable you to:

  • Recognize mould and the conditions, which are favourable to its growth;
  • Identify jobs that can potentially pose a risk of harmful mould exposure;
  • Plan workplace mould surveys to identify mould problems;
  • Understand how to clean up mould;
  • Understand when mould measurement and analysis are needed;
  • Interpret information from mould measurement; and
  • Develop and implement a mould management and control program.


This guide provides basic information for recognizing mould, cleaning it up and preventing its growth.

This guide is written in plain, non-technical language.Extensive technical details of different types of mould and their biological mechanisms are beyond the scope of this guide. For a detailed technical evaluation of mould exposure and implementation of control measures, an occupational hygienist or other qualified professional with appropriate expertise should be consulted. For additional information please contact the Inquiries Service of the Canadian Centre for Occupational Health and Safety (CCOHS).

Target Audience

This guide is for workers, their supervisors, health and safety committee members, health and safety representatives, occupational health and safety professionals and others with an interest in recognition, evaluation and control of mould in the workplace. This guide will serve as handout in training sessions and safety meetings.

Each publication produced by CCOHS undergoes several stages of review. As part of this review, representatives from government, employers, and labour are requested to comment on draft copies of CCOHS documents for technical accuracy and readability.

Although every effort is made to ensure accuracy and completeness of the information, it is understood that CCOHS makes no warranty as to the accuracy or completeness of such information and assumes no liability for any damages or loss suffered as a result of any inaccuracy or incompleteness therein.


The CCOHS Difference

CCOHS publications are unique in that they are developed by subject specialists in the field, and reviewed by representatives from labour, employers and government to ensure the content and approach are unbiased and credible.


Although our publications are protected by copyright, permission for non-commercial reproduction may be provided.

Please use our Copyright Authorization Form to request permission, or contact us for more information.