Middlesex-London Health Unit

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Health Hazards

The Health Protection and Promotion Act (R.S.O. 1990, c. H.7),1 defines a health hazard as:

  • a condition of a premise
  • a substance, thing, plant or animal other than man, or
  • a solid, liquid, gas or combination of any of them

... that has or that is likely to have an adverse (harmful) effect on the health of a person. This means that anything that worsens someone’s health is a possible health hazard.

  • A picture of a brick houseHousing
    Have a problem in your home, such as mould, bed bugs or unsafe drinking water? Learn how we can help.
  • A picture of a thermometer showing a summer temperatureExtreme Temperatures
    Are you concerned about extreme heat or extreme cold? Learn more about heat alerts and cold alerts and steps you can take to protect yourself.
  • A picture of a cooling towerCooling Towers
    Do you operate a cooling tower system? Learn more about the Cooling Tower Registration Project and how to register your system and towers. 

Health Impacts of Climate Change in Middlesex-London

Front page of the MLHU's climate change report

View the report →


What is the Middlesex-London Health Unit’s role?

In Ontario, health hazard prevention and management is one of the mandatory programs under the Ontario Public Health Standards which health units are required to deliver to the public.

Public Health Inspectors at the Middlesex-London Health Unit follow up on possible health hazards to help prevent and reduce health hazards in the community.

Additional Information

For more information on health hazards, please continue to browse this website, or speak to a Public Health Inspector on the Environmental Health Team by calling:

  • 519-663-5317 ext. 2300
Date of creation: December 11, 2012
Last modified on: August 24, 2017

Related Content



1Ontario. Ministry of the Attorney General. (1990). Health Protection and Promotion Act, R.S.O. 1990, c. H.7. Retrieved from