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A river where oil has been spilled into the water

Pollution prevention

Report a spill
If a flammable, poisonous, corrosive or explosive material gets spilled, it can be unsafe for people and the environment. To report a spill, call the Region of Peel at 905-791-7800 or the Ontario Ministry of the Environment toll free at 1-800-268-6060.

Preventing stormwater pollution from entering Lake Ontario is very important. Lake Ontario is the source of Mississauga’s drinking water.

Stormwater runoff, made up of rainwater and melted snow, can be easily polluted by substances like car soaps, soil, grass clippings and yard waste, oil and antifreeze from cars, toxic chemicals, cigarette butts and litter and waste from pets as it flows across driveways, properties and roads. This pollution can then quickly flow into local creeks before ending up in Lake Ontario.

Preventing spills, cleaning up pollutants, choosing safe disposal options and non-hazardous materials and reporting spills and discharges, we all play an important part in reducing the impact of stormwater pollution in the Great Lakes, our water and our community.

Learn more about how the City is reducing stormwater pollution and protecting the City’s stormwater system.

How you can help prevent pollution

  • Keep yard waste in appropriate containers away from roadside catchbasins
  • Wash your vehicles at a car wash. This helps ensure water containing dirt and cleaning products flows into the sanitary sewer for treatment instead of into the natural environment.
  • Maintain your car regularly to make sure engine fluids are not leaking. Clean up any spills or leaks promptly.
  • Dispose of chlorinated and salt water pool wastewater safely. For more information check the Pool Water: Safe Water Practices for Pool and Spa Owners.
  • Vacuum, sweep, and use rags or dry absorbents on your driveway instead of hosing it down. This runoff goes into the nearest roadside catchbasin and then into the natural environment.
  • Select native and adapted plants that need less fertilizer to minimize contaminated runoff
  • Apply lawn and garden chemicals sparingly and according to directions.
  • Keep litter, pet waste and debris out of street gutters, storm catchbasins and ditches
  • If you’re completing renovations, make sure your contractor disposes of any construction waste according to the Storm Sewer By-law. Never discharge soil-laden water into catchbasins.     
  • Limit the amount of de-icing salt or sand you use in the winter. Shovel and scrape snow and ice first.
  • Dispose of cigarette butts safely in a designated spot
  • Dispose of all food and beverage wastes either as solid waste for curbside pick-up or into the sanitary sewer system
  • Use the Region of Peel’s Community Recycling Centres to dispose of hazardous waste like used oil, antifreeze, paints or other household chemicals

Storm Sewer By-law

The Storm Sewer By-law sets strict limits on what can be discharged into the stormwater drainage system. Any substance other than stormwater can harm the environment and damage the storm sewer system.

The by-law lists pollutants that can damage the natural environment and the storm sewer system. Private drainage systems typically connect to the City’s storm sewer system and must be maintained by the property owner. The pollutants listed in the by-law also apply to any private drainage system that discharges to the City’s system.

If an individual or a company violates the Storm Sewer By-Law, they can be liable for cleanup, repair costs and fines.

If you want more information, or if you’ve seen an act that may not comply with the by-law, please contact 311 (905-615-4311 outside City limits).