Limit the amount of storm wastewater overflow
Overall effectiveness category No evidence found (no assessment)
Number of studies: 0
Background information and definitions
Some sewer systems collect rainwater runoff, sewage, and industrial wastewater in the same pipe, where it is then transported to a sewage treatment plant. During heavy rainfall events or snow melt, the volume of wastewater can exceed the capacity of treatment facilities. In such instances, sewer systems can overflow and discharge untreated storm water and wastewater directly into rivers and seas (Moffa 1997). Untreated wastewater reaching aquatic environments may impact marine and freshwater mammals through the introduction of bacteria and viruses, excess nutrients, toxic substances, and solid particles. Limiting the amount of untreated storm and wastewaters overflowing, for instance by increasing the capacity of treatment facilities, may reduce pollution levels and associated risks to marine and freshwater mammals.
For an intervention related to reducing litter in stormwater, see Install stormwater traps or grids.
Moffa P.E. (1997) The control and treatment of combined sewer overflows. John Wiley & Sons.