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RAIN: What's the problem?

Rivers and lakes are polluted as a result of conventional approaches to urban landscaping and stormwater management. Urban areas are covered with hard surfaces – buildings, streets, driveways, walkways, parking lots. Stormwater systems are engineered to facilitate or speed-up runoff, leaving a legacy of poor water quality. Health problems related to water pollution in general are estimated to cost Canadians $300 million per year.

Large concentrations of toxic chemicals, such as oil, polycyclic aromatic hydrocarbons (PAHs) and heavy metals, wash from the urban environment into the storm sewer system when it rains or during spring snow melts. Hardened surfaces disrupt the natural water cycle and prevent rain from soaking into the ground, bypassing the natural filtration of soil and vegetation.

It is estimated that combined sewer overflows from cities around the Great Lakes amount to hundreds of billions of litres of raw sewage and stormwater each year. Further, the under-funding of updating and replacement of storm sewers is expected to continue for at least two decades and will continue to contribute to degradation of receiving waters.

In summary, stormwater runoff impacts water quality and quantity by:

RAIN: What's the solution?

Reduce the volume of rain entering the stormwater system by capturing it and releasing it more slowly.


Allow more rain to soak into the ground by increasing permeable areas.


Avoid releasing pollutants (pet waste, lawn fertilizer, fuels, carwash effluent and other pollutants).



It's easy. We'll show you how in one of of our local events, workshops, presentations and generally being on-hand to answer your questions when you have them. Visit or call one of our local offices soon.



Environmental Commissioner of Ontario, Redefining Conservation: Annual Report 2009/10, Gord Miller, et al. 2010.

EcoJustice Canada (Dr. Elaine MacDonald,  Liat Podolsky, Jode Roberts, Kori Brus). Flushing out the truth: Sewage Dumping in Ontario, 2009.

EcoJustice Canada (Dr. Elaine MacDonald,  Liat Podolsky). GREEN CITIES, GREAT LAKES: Using Green Infrastructure to Reduce Combined Sewer Overflows, 2008.