The Storm Sewer System versus Sanitary Sewer System : What ’ s the Difference ?
It ’ s as simple as inside vs . outside . Storm drain systems consist of natural and manmade channels and underground pipes that transport rainwater from streets , yards , rooftops , and other areas outside your home . This water goes directly to creeks , rivers , streams , and lakes carrying pollutants with it . Water entering the storm drain is not treated .
Sanitary Systems are composed of a branding network of pipes and manholes . This system is used to collect and transport the water ( also known as wastewater ) from sinks , washing machines , toilets , and other indoor plumbing . Wastewater entering the sanitary system flows directly to a wastewater treatment plant where it is treated , disinfected , and then released to area water sources .
These two systems are not connected .
RIGHT : The figure shows both stormwater and sanitary underground system . Note that the systems are not interconnected .
LEFT : The blue area in the figure represents the stormwater system ( outside the home ) while the yellow area represents the sanitary sewer system ( inside the home ).
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Key Term : WASTEWATER : Water that has been used , as for washing , flushing , or in a manufacturing process , and so contains waste products ; sewage .
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Photo provided by : City of Reno , NV .